🐛 Redundant Temp Sensor followup (#22196)

Marlin/Configuration.h

 // @section temperature
 
 /**
- * --NORMAL IS 4.7kohm PULLUP!-- 1kohm pullup can be used on hotend sensor, using correct resistor and table
+ * --NORMAL IS 4.7kΩ PULLUP!-- 1kΩ pullup can be used on hotend sensor, using correct resistor and table
  *
  * Temperature sensors available:
  *
- *    -5 : PT100 / PT1000 with MAX31865 (only for sensors 0-1)
- *    -3 : thermocouple with MAX31855 (only for sensors 0-1)
- *    -2 : thermocouple with MAX6675 (only for sensors 0-1)
- *    -4 : thermocouple with AD8495
- *    -1 : thermocouple with AD595
+ *  SPI RTD/Thermocouple Boards - IMPORTANT: Read the NOTE below!
+ *  -------
+ *    -5 : MAX31865 with Pt100/Pt1000, 2, 3, or 4-wire  (only for sensors 0-1)
+ *                  NOTE: You must uncomment/set the MAX31865_*_OHMS_n defines below.
+ *    -3 : MAX31855 with Thermocouple, -200°C to +700°C (only for sensors 0-1)
+ *    -2 : MAX6675  with Thermocouple, 0°C to +700°C    (only for sensors 0-1)
+ *
+ *  NOTE: Ensure TEMP_n_CS_PIN is set in your pins file for each TEMP_SENSOR_n using an SPI Thermocouple. By default,
+ *        Hardware SPI on the default serial bus is used. If you have also set TEMP_n_SCK_PIN and TEMP_n_MISO_PIN,
+ *        Software SPI will be used on those ports instead. You can force Hardware SPI on the default bus in the
+ *        Configuration_adv.h file. At this time, separate Hardware SPI buses for sensors are not supported.
+ *
+ *  Analog Themocouple Boards
+ *  -------
+ *    -4 : AD8495 with Thermocouple
+ *    -1 : AD595  with Thermocouple
+ *
+ *  Analog Thermistors - 4.7kΩ pullup - Normal
+ *  -------
+ *     1 : 100kΩ  EPCOS - Best choice for EPCOS thermistors
+ *   331 : 100kΩ  Same as #1, but 3.3V scaled for MEGA
+ *   332 : 100kΩ  Same as #1, but 3.3V scaled for DUE
+ *     2 : 200kΩ  ATC Semitec 204GT-2
+ *   202 : 200kΩ  Copymaster 3D
+ *     3 : ???Ω   Mendel-parts thermistor
+ *     4 : 10kΩ   Generic Thermistor !! DO NOT use for a hotend - it gives bad resolution at high temp. !!
+ *     5 : 100kΩ  ATC Semitec 104GT-2/104NT-4-R025H42G - Used in ParCan, J-Head, and E3D, SliceEngineering 300°C
+ *   501 : 100kΩ  Zonestar - Tronxy X3A
+ *   502 : 100kΩ  Zonestar - used by hot bed in Zonestar Průša P802M
+ *   512 : 100kΩ  RPW-Ultra hotend
+ *     6 : 100kΩ  EPCOS - Not as accurate as table #1 (created using a fluke thermocouple)
+ *     7 : 100kΩ  Honeywell 135-104LAG-J01
+ *    71 : 100kΩ  Honeywell 135-104LAF-J01
+ *     8 : 100kΩ  Vishay 0603 SMD NTCS0603E3104FXT
+ *     9 : 100kΩ  GE Sensing AL03006-58.2K-97-G1
+ *    10 : 100kΩ  RS PRO 198-961
+ *    11 : 100kΩ  Keenovo AC silicone mats, most Wanhao i3 machines - beta 3950, 1%
+ *    12 : 100kΩ  Vishay 0603 SMD NTCS0603E3104FXT (#8) - calibrated for Makibox hot bed
+ *    13 : 100kΩ  Hisens up to 300°C - for "Simple ONE" & "All In ONE" hotend - beta 3950, 1%
+ *    15 : 100kΩ  Calibrated for JGAurora A5 hotend
+ *    18 : 200kΩ  ATC Semitec 204GT-2 Dagoma.Fr - MKS_Base_DKU001327
+ *    22 : 100kΩ  GTM32 Pro vB - hotend - 4.7kΩ pullup to 3.3V and 220Ω to analog input
+ *    23 : 100kΩ  GTM32 Pro vB - bed - 4.7kΩ pullup to 3.3v and 220Ω to analog input
+ *    30 : 100kΩ  Kis3d Silicone heating mat 200W/300W with 6mm precision cast plate (EN AW 5083) NTC100K - beta 3950
+ *    60 : 100kΩ  Maker's Tool Works Kapton Bed Thermistor - beta 3950
+ *    61 : 100kΩ  Formbot/Vivedino 350°C Thermistor - beta 3950
+ *    66 : 4.7MΩ  Dyze Design High Temperature Thermistor
+ *    67 : 500kΩ  SliceEngineering 450°C Thermistor
+ *    70 : 100kΩ  bq Hephestos 2
+ *    75 : 100kΩ  Generic Silicon Heat Pad with NTC100K MGB18-104F39050L32
+ *
+ *  Analog Thermistors - 1kΩ pullup - Atypical, and requires changing out the 4.7kΩ pullup for 1kΩ.
+ *  -------                           (but gives greater accuracy and more stable PID)
+ *    51 : 100kΩ  EPCOS (1kΩ pullup)
+ *    52 : 200kΩ  ATC Semitec 204GT-2 (1kΩ pullup)
+ *    55 : 100kΩ  ATC Semitec 104GT-2 - Used in ParCan & J-Head (1kΩ pullup)
+ *
+ *  Analog Thermistors - 10kΩ pullup - Atypical
+ *  -------
+ *    99 : 100kΩ  Found on some Wanhao i3 machines with a 10kΩ pull-up resistor
+ *
+ *  Analog RTDs (Pt100/Pt1000)
+ *  -------
+ *   110 : Pt100  with 1kΩ pullup (atypical)
+ *   147 : Pt100  with 4.7kΩ pullup
+ *  1010 : Pt1000 with 1kΩ pullup (atypical)
+ *  1047 : Pt1000 with 4.7kΩ pullup (E3D)
+ *    20 : Pt100  with circuit in the Ultimainboard V2.x with mainboard ADC reference voltage = INA826 amplifier-board supply voltage.
+ *                NOTE: (1) Must use an ADC input with no pullup. (2) Some INA826 amplifiers are unreliable at 3.3V so consider using sensor 147, 110, or 21.
+ *    21 : Pt100  with circuit in the Ultimainboard V2.x with 3.3v ADC reference voltage (STM32, LPC176x....) and 5V INA826 amplifier board supply.
+ *                NOTE: ADC pins are not 5V tolerant. Not recommended because it's possible to damage the CPU by going over 500°C.
+ *   201 : Pt100  with circuit in Overlord, similar to Ultimainboard V2.x
+ *
+ *  Custom/Dummy/Other Thermos
+ *  ------
  *     0 : not used
- *     1 : 100k thermistor - best choice for EPCOS 100k (4.7k pullup)
- *   331 : (3.3V scaled thermistor 1 table for MEGA)
- *   332 : (3.3V scaled thermistor 1 table for DUE)
- *     2 : 200k thermistor - ATC Semitec 204GT-2 (4.7k pullup)
- *   202 : 200k thermistor - Copymaster 3D
- *     3 : Mendel-parts thermistor (4.7k pullup)
- *     4 : 10k thermistor !! do not use it for a hotend. It gives bad resolution at high temp. !!
- *     5 : 100K thermistor - ATC Semitec 104GT-2/104NT-4-R025H42G (Used in ParCan, J-Head, and E3D) (4.7k pullup)
- *   501 : 100K Zonestar (Tronxy X3A) Thermistor
- *   502 : 100K Zonestar Thermistor used by hot bed in Zonestar Průša P802M
- *   512 : 100k RPW-Ultra hotend thermistor (4.7k pullup)
- *     6 : 100k EPCOS - Not as accurate as table 1 (created using a fluke thermocouple) (4.7k pullup)
- *     7 : 100k Honeywell thermistor 135-104LAG-J01 (4.7k pullup)
- *    71 : 100k Honeywell thermistor 135-104LAF-J01 (4.7k pullup)
- *     8 : 100k 0603 SMD Vishay NTCS0603E3104FXT (4.7k pullup)
- *     9 : 100k GE Sensing AL03006-58.2K-97-G1 (4.7k pullup)
- *    10 : 100k RS thermistor 198-961 (4.7k pullup)
- *    11 : 100k beta 3950 1% thermistor (Used in Keenovo AC silicone mats and most Wanhao i3 machines) (4.7k pullup)
- *    12 : 100k 0603 SMD Vishay NTCS0603E3104FXT (4.7k pullup) (calibrated for Makibox hot bed)
- *    13 : 100k Hisens 3950  1% up to 300°C for hotend "Simple ONE " & "Hotend "All In ONE"
- *    15 : 100k thermistor calibration for JGAurora A5 hotend
- *    18 : ATC Semitec 204GT-2 (4.7k pullup) Dagoma.Fr - MKS_Base_DKU001327
- *    20 : Pt100 with circuit in the Ultimainboard V2.x with mainboard ADC reference voltage = INA826 amplifier-board supply voltage.
- *         NOTES: (1) Must use an ADC input with no pullup. (2) Some INA826 amplifiers are unreliable at 3.3V so consider using sensor 147, 110, or 21.
- *    21 : Pt100 with circuit in the Ultimainboard V2.x with 3.3v ADC reference voltage (STM32, LPC176x....) and 5V INA826 amplifier board supply.
- *         NOTE: ADC pins are not 5V tolerant. Not recommended because it's possible to damage the CPU by going over 500°C.
- *    22 : 100k (hotend) with 4.7k pullup to 3.3V and 220R to analog input (as in GTM32 Pro vB)
- *    23 : 100k (bed) with 4.7k pullup to 3.3v and 220R to analog input (as in GTM32 Pro vB)
- *    30 : Kis3d Silicone heating mat 200W/300W with 6mm precision cast plate (EN AW 5083) NTC100K / B3950 (4.7k pullup)
- *   201 : Pt100 with circuit in Overlord, similar to Ultimainboard V2.x
- *    60 : 100k Maker's Tool Works Kapton Bed Thermistor beta=3950
- *    61 : 100k Formbot / Vivedino 3950 350C thermistor 4.7k pullup
- *    66 : 4.7M High Temperature thermistor from Dyze Design
- *    67 : 450C thermistor from SliceEngineering
- *    70 : the 100K thermistor found in the bq Hephestos 2
- *    75 : 100k Generic Silicon Heat Pad with NTC 100K MGB18-104F39050L32 thermistor
- *    99 : 100k thermistor with a 10K pull-up resistor (found on some Wanhao i3 machines)
- *
- *       1k ohm pullup tables - This is atypical, and requires changing out the 4.7k pullup for 1k.
- *                              (but gives greater accuracy and more stable PID)
- *    51 : 100k thermistor - EPCOS (1k pullup)
- *    52 : 200k thermistor - ATC Semitec 204GT-2 (1k pullup)
- *    55 : 100k thermistor - ATC Semitec 104GT-2 (Used in ParCan & J-Head) (1k pullup)
- *
- *  1047 : Pt1000 with 4k7 pullup (E3D)
- *  1010 : Pt1000 with 1k pullup (non standard)
- *   147 : Pt100 with 4k7 pullup
- *   110 : Pt100 with 1k pullup (non standard)
- *
  *  1000 : Custom - Specify parameters in Configuration_adv.h
  *
- *         Use these for Testing or Development purposes. NEVER for production machine.
+ *   !!! Use these for Testing or Development purposes. NEVER for production machine. !!!
  *   998 : Dummy Table that ALWAYS reads 25°C or the temperature defined below.
  *   999 : Dummy Table that ALWAYS reads 100°C or the temperature defined below.
+ *
  */
 #define TEMP_SENSOR_0 1
 #define TEMP_SENSOR_1 0
 
 // Resistor values when using MAX31865 sensors (-5) on TEMP_SENSOR_0 / 1
 //#define MAX31865_SENSOR_OHMS_0      100   // (Ω) Typically 100 or 1000 (PT100 or PT1000)
-//#define MAX31865_CALIBRATION_OHMS_0 430   // (Ω) Typically 430 for AdaFruit PT100; 4300 for AdaFruit PT1000
+//#define MAX31865_CALIBRATION_OHMS_0 430   // (Ω) Typically 430 for Adafruit PT100; 4300 for Adafruit PT1000
 //#define MAX31865_SENSOR_OHMS_1      100
 //#define MAX31865_CALIBRATION_OHMS_1 430
 

Marlin/Configuration_adv.h

   #define REDUNDANT_BETA                   3950    // Beta value
 #endif
 
-//
-// Hephestos 2 24V heated bed upgrade kit.
-// https://store.bq.com/en/heated-bed-kit-hephestos2
-//
+/**
+ * Configuration options for MAX Thermocouples (-2, -3, -5).
+ *   FORCE_HW_SPI:   Ignore SCK/MOSI/MISO pins and just use the CS pin & default SPI bus.
+ *   MAX31865_WIRES: Set the number of wires for the probe connected to a MAX31865 board, 2-4. Default: 2
+ *   MAX31865_50HZ:  Enable 50Hz filter instead of the default 60Hz.
+ */
+//#define TEMP_SENSOR_FORCE_HW_SPI
+//#define MAX31865_SENSOR_WIRES_0 2
+//#define MAX31865_SENSOR_WIRES_1 2
+//#define MAX31865_50HZ_FILTER
+
+/**
+ * Hephestos 2 24V heated bed upgrade kit.
+ * https://store.bq.com/en/heated-bed-kit-hephestos2
+ */
 //#define HEPHESTOS2_HEATED_BED_KIT
 #if ENABLED(HEPHESTOS2_HEATED_BED_KIT)
   #undef TEMP_SENSOR_BED

Marlin/src/HAL/SAMD51/inc/SanityCheck.h

   #error "No custom SD drive cable defined for this board."
 #endif
 
-#if defined(MAX6675_SCK_PIN) && defined(MAX6675_DO_PIN) && (MAX6675_SCK_PIN == SCK1 || MAX6675_DO_PIN == MISO1)
+#if (defined(TEMP_0_SCK_PIN) && defined(TEMP_0_MISO_PIN) && (TEMP_0_SCK_PIN == SCK1 || TEMP_0_MISO_PIN == MISO1)) || \
+    (defined(TEMP_1_SCK_PIN) && defined(TEMP_1_MISO_PIN) && (TEMP_1_SCK_PIN == SCK1 || TEMP_1_MISO_PIN == MISO1))
   #error "OnBoard SPI BUS can't be shared with other devices."
 #endif
 

Marlin/src/MarlinCore.cpp

 
   // Init and disable SPI thermocouples; this is still needed
   #if TEMP_SENSOR_0_IS_MAX_TC || (TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 0)
-    OUT_WRITE(MAX6675_SS_PIN, HIGH);  // Disable
+    OUT_WRITE(TEMP_0_CS_PIN, HIGH);  // Disable
   #endif
   #if TEMP_SENSOR_1_IS_MAX_TC || (TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 1)
-    OUT_WRITE(MAX6675_SS2_PIN, HIGH); // Disable
+    OUT_WRITE(TEMP_1_CS_PIN, HIGH);
   #endif
 
   #if ENABLED(DUET_SMART_EFFECTOR) && PIN_EXISTS(SMART_EFFECTOR_MOD)

Marlin/src/core/macros.h

 #define __TERN(T,V...)      ___TERN(_CAT(_NO,T),V)  // Prepend '_NO' to get '_NOT_0' or '_NOT_1'
 #define ___TERN(P,V...)     THIRD(P,V)              // If first argument has a comma, A. Else B.
 
-#define _OPTARG(A)          , A
-#define OPTARG(O,A)         TERN_(O,DEFER4(_OPTARG)(A))
+#define _OPTARG(A...)       , A
+#define OPTARG(O,A...)      TERN_(O,DEFER4(_OPTARG)(A))
 #define _OPTCODE(A)         A;
 #define OPTCODE(O,A)        TERN_(O,DEFER4(_OPTCODE)(A))
 

Marlin/src/gcode/calibrate/G34_M422.cpp

           sprintf_P(msg,
             PSTR("1:2=%s" TERN_(TRIPLE_Z, " 3-2=%s 3-1=%s") TERN_(QUAD_Z, " 4-3=%s 4-2=%s 4-1=%s")),
             dtostrf(ABS(z_measured[1] - z_measured[0]), 1, 3, fstr1)
-            OPTARG(TRIPLE_Z, dtostrf(ABS(z_measured[2] - z_measured[1]), 1, 3, fstr2))
-            OPTARG(TRIPLE_Z, dtostrf(ABS(z_measured[2] - z_measured[0]), 1, 3, fstr3))
-            OPTARG(QUAD_Z,   dtostrf(ABS(z_measured[3] - z_measured[2]), 1, 3, fstr4))
-            OPTARG(QUAD_Z,   dtostrf(ABS(z_measured[3] - z_measured[1]), 1, 3, fstr5))
-            OPTARG(QUAD_Z,   dtostrf(ABS(z_measured[3] - z_measured[0]), 1, 3, fstr6))
+            OPTARG(TRIPLE_Z,
+              dtostrf(ABS(z_measured[2] - z_measured[1]), 1, 3, fstr2),
+              dtostrf(ABS(z_measured[2] - z_measured[0]), 1, 3, fstr3))
+            OPTARG(QUAD_Z,
+              dtostrf(ABS(z_measured[3] - z_measured[2]), 1, 3, fstr4),
+              dtostrf(ABS(z_measured[3] - z_measured[1]), 1, 3, fstr5),
+              dtostrf(ABS(z_measured[3] - z_measured[0]), 1, 3, fstr6))
           );
           ui.set_status(msg);
         #endif

Marlin/src/inc/Conditionals_post.h

 
 #if TEMP_SENSOR_0 == -5 || TEMP_SENSOR_0 == -3 || TEMP_SENSOR_0 == -2
   #define TEMP_SENSOR_0_IS_MAX_TC 1
-  #define HAS_MAX_TC 1
-  #if TEMP_SENSOR_0 == -3
-    #define TEMP_SENSOR_0_MAX_TC_TMIN -270
-    #define TEMP_SENSOR_0_MAX_TC_TMAX 1800
-  #else
-    #define TEMP_SENSOR_0_MAX_TC_TMIN    0
-    #define TEMP_SENSOR_0_MAX_TC_TMAX 1024
-  #endif
   #if TEMP_SENSOR_0 == -5
     #define TEMP_SENSOR_0_IS_MAX31865 1
+    #define TEMP_SENSOR_0_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_0_MAX_TC_TMAX 1024
+    #ifndef MAX31865_SENSOR_WIRES_0
+      #define MAX31865_SENSOR_WIRES_0 2
+    #endif
   #elif TEMP_SENSOR_0 == -3
     #define TEMP_SENSOR_0_IS_MAX31855 1
+    #define TEMP_SENSOR_0_MAX_TC_TMIN -270
+    #define TEMP_SENSOR_0_MAX_TC_TMAX 1800
   #elif TEMP_SENSOR_0 == -2
     #define TEMP_SENSOR_0_IS_MAX6675 1
+    #define TEMP_SENSOR_0_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_0_MAX_TC_TMAX 1024
   #endif
 #elif TEMP_SENSOR_0 == -4
   #define TEMP_SENSOR_0_IS_AD8495 1
 
 #if TEMP_SENSOR_1 == -5 || TEMP_SENSOR_1 == -3 || TEMP_SENSOR_1 == -2
   #define TEMP_SENSOR_1_IS_MAX_TC 1
-  #define HAS_MAX_TC 1
-  #if TEMP_SENSOR_1 == -3
-    #define TEMP_SENSOR_1_MAX_TC_TMIN -270
-    #define TEMP_SENSOR_1_MAX_TC_TMAX 1800
-  #else
-    #define TEMP_SENSOR_1_MAX_TC_TMIN    0
-    #define TEMP_SENSOR_1_MAX_TC_TMAX 1024
-  #endif
   #if TEMP_SENSOR_1 == -5
     #define TEMP_SENSOR_1_IS_MAX31865 1
+    #define TEMP_SENSOR_1_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_1_MAX_TC_TMAX 1024
+    #ifndef MAX31865_SENSOR_WIRES_1
+      #define MAX31865_SENSOR_WIRES_1 2
+    #endif
   #elif TEMP_SENSOR_1 == -3
     #define TEMP_SENSOR_1_IS_MAX31855 1
+    #define TEMP_SENSOR_1_MAX_TC_TMIN -270
+    #define TEMP_SENSOR_1_MAX_TC_TMAX 1800
   #elif TEMP_SENSOR_1 == -2
     #define TEMP_SENSOR_1_IS_MAX6675 1
+    #define TEMP_SENSOR_1_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_1_MAX_TC_TMAX 1024
   #endif
+
   #if TEMP_SENSOR_1 != TEMP_SENSOR_0
     #if   TEMP_SENSOR_1 == -5
       #error "If MAX31865 Thermocouple (-5) is used for TEMP_SENSOR_1 then TEMP_SENSOR_0 must match."
 
 #if TEMP_SENSOR_REDUNDANT == -5 || TEMP_SENSOR_REDUNDANT == -3 || TEMP_SENSOR_REDUNDANT == -2
   #define TEMP_SENSOR_REDUNDANT_IS_MAX_TC 1
-  #define HAS_MAX_TC 1
-  #if TEMP_SENSOR_REDUNDANT == -3
-    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN -270
-    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1800
-  #else
-    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN    0
-    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1024
-  #endif
-  #if TEMP_SENSOR_REDUNDANT_SOURCE == 0
-    #define TEMP_SENSOR_0_MAX_TC_TMIN TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN
-    #define TEMP_SENSOR_0_MAX_TC_TMAX TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX
-  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 1
-    #define TEMP_SENSOR_1_MAX_TC_TMIN TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN
-    #define TEMP_SENSOR_1_MAX_TC_TMAX TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX
-  #endif
+
   #if TEMP_SENSOR_REDUNDANT == -5
     #if TEMP_SENSOR_REDUNDANT_SOURCE != 0 && TEMP_SENSOR_REDUNDANT_SOURCE != 1
       #error "MAX31865 Thermocouples (-5) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
     #endif
-    #define TEMP_SENSOR_REDUNDANT_IS_MAX31865 1
+
+    #define TEMP_SENSOR_REDUNDANT_IS_MAX31865    1
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1024
   #elif TEMP_SENSOR_REDUNDANT == -3
     #if TEMP_SENSOR_REDUNDANT_SOURCE != 0 && TEMP_SENSOR_REDUNDANT_SOURCE != 1
       #error "MAX31855 Thermocouples (-3) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
     #endif
-    #define TEMP_SENSOR_REDUNDANT_IS_MAX31855 1
+
+    #define TEMP_SENSOR_REDUNDANT_IS_MAX31855    1
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN -270
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1800
   #elif TEMP_SENSOR_REDUNDANT == -2
     #if TEMP_SENSOR_REDUNDANT_SOURCE != 0 && TEMP_SENSOR_REDUNDANT_SOURCE != 1
       #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
     #endif
-    #define TEMP_SENSOR_REDUNDANT_IS_MAX6675 1
+
+    #define TEMP_SENSOR_REDUNDANT_IS_MAX6675     1
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1024
   #endif
+
+  // mimic setting up the source TEMP_SENSOR
+  #if TEMP_SENSOR_REDUNDANT_SOURCE == 0
+    #define TEMP_SENSOR_0_MAX_TC_TMIN TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN
+    #define TEMP_SENSOR_0_MAX_TC_TMAX TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX
+    #ifndef MAX31865_SENSOR_WIRES_0
+      #define MAX31865_SENSOR_WIRES_0 2
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 1
+    #define TEMP_SENSOR_1_MAX_TC_TMIN TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN
+    #define TEMP_SENSOR_1_MAX_TC_TMAX TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX
+    #ifndef MAX31865_SENSOR_WIRES_1
+      #define MAX31865_SENSOR_WIRES_1 2
+    #endif
+  #endif
+
   #if (TEMP_SENSOR_0_IS_MAX_TC && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_0) || (TEMP_SENSOR_1_IS_MAX_TC && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_1)
     #if   TEMP_SENSOR_REDUNDANT == -5
       #error "If MAX31865 Thermocouple (-5) is used for TEMP_SENSOR_0/TEMP_SENSOR_1 then TEMP_SENSOR_REDUNDANT must match."
   #endif
 #endif
 
+#if TEMP_SENSOR_0_IS_MAX_TC || TEMP_SENSOR_1_IS_MAX_TC || TEMP_SENSOR_REDUNDANT_IS_MAX_TC
+  #define HAS_MAX_TC 1
+#endif
+#if TEMP_SENSOR_0_IS_MAX6675 || TEMP_SENSOR_1_IS_MAX6675 || TEMP_SENSOR_REDUNDANT_IS_MAX6675
+  #define HAS_MAX6675 1
+#endif
 #if TEMP_SENSOR_0_IS_MAX31855 || TEMP_SENSOR_1_IS_MAX31855 || TEMP_SENSOR_REDUNDANT_IS_MAX31855
   #define HAS_MAX31855 1
 #endif
 #if TEMP_SENSOR_0_IS_MAX31865 || TEMP_SENSOR_1_IS_MAX31865 || TEMP_SENSOR_REDUNDANT_IS_MAX31865
   #define HAS_MAX31865 1
 #endif
-#if TEMP_SENSOR_0_IS_MAX6675 || TEMP_SENSOR_1_IS_MAX6675 || TEMP_SENSOR_REDUNDANT_IS_MAX6675
-  #define HAS_MAX6675 1
-#endif
 
 //
 // Compatibility layer for MAX (SPI) temp boards
 //
-#define TEMP_SENSOR_IS_MAX(n, M) (ENABLED(TEMP_SENSOR_##n##_IS_##M) || (ENABLED(TEMP_SENSOR_REDUNDANT_IS_##M) && TEMP_SENSOR_REDUNDANT_SOURCE == (n)))
+#if HAS_MAX_TC
+
+  // Translate old _SS, _CS, _SCK, _DO, _DI, _MISO, and _MOSI PIN defines.
+  #if TEMP_SENSOR_0_IS_MAX_TC || (TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 1)
+
+    #if !PIN_EXISTS(TEMP_0_CS) // SS, CS
+      #if PIN_EXISTS(MAX6675_SS)
+        #define TEMP_0_CS_PIN MAX6675_SS_PIN
+      #elif PIN_EXISTS(MAX6675_CS)
+        #define TEMP_0_CS_PIN MAX6675_CS_PIN
+      #elif PIN_EXISTS(MAX31855_SS)
+        #define TEMP_0_CS_PIN MAX31855_SS_PIN
+      #elif PIN_EXISTS(MAX31855_CS)
+        #define TEMP_0_CS_PIN MAX31855_CS_PIN
+      #elif PIN_EXISTS(MAX31865_SS)
+        #define TEMP_0_CS_PIN MAX31865_SS_PIN
+      #elif PIN_EXISTS(MAX31865_CS)
+        #define TEMP_0_CS_PIN MAX31865_CS_PIN
+      #endif
+    #endif
 
-#if PIN_EXISTS(MAX6675_SS)
-  #if TEMP_SENSOR_IS_MAX(0, MAX31855)
-    #define MAX31855_CS_PIN MAX6675_SS_PIN
-  #elif TEMP_SENSOR_IS_MAX(0, MAX31865)
-    #define MAX31865_CS_PIN MAX6675_SS_PIN
-  #elif TEMP_SENSOR_IS_MAX(0, MAX6675)
-    #define MAX6675_CS_PIN MAX6675_SS_PIN
-  #endif
-#endif
+    #if TEMP_SENSOR_0_IS_MAX6675
+      #if !PIN_EXISTS(TEMP_0_MISO) // DO
+        #if PIN_EXISTS(MAX6675_MISO)
+          #define TEMP_0_MISO_PIN MAX6675_MISO_PIN
+        #elif PIN_EXISTS(MAX6675_DO)
+          #define TEMP_0_MISO_PIN MAX6675_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_0_SCK) && PIN_EXISTS(MAX6675_SCK)
+        #define TEMP_0_SCK_PIN MAX6675_SCK_PIN
+      #endif
 
-#if PIN_EXISTS(MAX6675_SS2)
-  #if TEMP_SENSOR_IS_MAX(1, MAX31855)
-    #define MAX31855_CS2_PIN MAX6675_SS2_PIN
-  #elif TEMP_SENSOR_IS_MAX(1, MAX31865)
-    #define MAX31865_CS2_PIN MAX6675_SS2_PIN
-  #elif TEMP_SENSOR_IS_MAX(1, MAX6675)
-    #define MAX6675_CS2_PIN MAX6675_SS2_PIN
-  #endif
-#endif
+    #elif TEMP_SENSOR_0_IS_MAX31855
+      #if !PIN_EXISTS(TEMP_0_MISO) // DO
+        #if PIN_EXISTS(MAX31855_MISO)
+          #define TEMP_0_MISO_PIN MAX31855_MISO_PIN
+        #elif PIN_EXISTS(MAX31855_DO)
+          #define TEMP_0_MISO_PIN MAX31855_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_0_SCK) && PIN_EXISTS(MAX31855_SCK)
+        #define TEMP_0_SCK_PIN MAX31855_SCK_PIN
+      #endif
 
-#if PIN_EXISTS(MAX6675_DO)
-  #if HAS_MAX31855
-    #define MAX31855_MISO_PIN MAX6675_DO_PIN
-  #elif HAS_MAX31865
-    #define MAX31865_MISO_PIN MAX6675_DO_PIN
-  #elif HAS_MAX6675
-    #define MAX6675_MISO_PIN MAX6675_DO_PIN
-  #endif
-#endif
+    #elif TEMP_SENSOR_1_IS_MAX31865
+      #if !PIN_EXISTS(TEMP_1_MISO) // DO
+        #if PIN_EXISTS(MAX31865_MISO)
+          #define TEMP_1_MISO_PIN MAX31865_MISO_PIN
+        #elif PIN_EXISTS(MAX31865_DO)
+          #define TEMP_1_MISO_PIN MAX31865_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_1_SCK) && PIN_EXISTS(MAX31865_SCK)
+        #define TEMP_1_SCK_PIN MAX31865_SCK_PIN
+      #endif
+      #if !PIN_EXISTS(TEMP_1_MOSI) && PIN_EXISTS(MAX31865_MOSI) // MOSI for '65 only
+        #define TEMP_1_MOSI_PIN MAX31865_MOSI_PIN
+      #endif
+    #endif
 
-#if PIN_EXISTS(MAX6675_SCK)
-  #if HAS_MAX31855
-    #define MAX31855_SCK_PIN MAX6675_SCK_PIN
-  #elif HAS_MAX31865
-    #define MAX31865_SCK_PIN MAX6675_SCK_PIN
-  #endif
-#endif
+    // Software SPI - enable if MISO/SCK are defined.
+    #if PIN_EXISTS(TEMP_0_MISO) && PIN_EXISTS(TEMP_0_SCK) && DISABLED(TEMP_SENSOR_0_FORCE_HW_SPI)
+      #if TEMP_SENSOR_0_IS_MAX31865 && !PIN_EXISTS(TEMP_0_MOSI)
+        #error "TEMP_SENSOR_0 MAX31865 requires TEMP_0_MOSI_PIN defined for Software SPI. To use Hardware SPI instead, undefine MISO/SCK or enable TEMP_SENSOR_0_FORCE_HW_SPI."
+      #else
+        #define TEMP_SENSOR_0_HAS_SPI_PINS 1
+      #endif
+    #endif
 
-// Compatibility Layer for use when HAL manipulates PINS for MAX31855 and MAX6675
-#if PIN_EXISTS(MAX31855_CS) && !PIN_EXISTS(MAX6675_SS)
-  #define MAX6675_SS_PIN MAX31855_CS_PIN
-#endif
-#if PIN_EXISTS(MAX31855_CS2) && !PIN_EXISTS(MAX6675_SS2)
-  #define MAX6675_SS2_PIN MAX31855_CS2_PIN
-#endif
-#if PIN_EXISTS(MAX6675_CS) && !PIN_EXISTS(MAX6675_SS)
-  #define MAX6675_SS_PIN MAX6675_CS_PIN
-#endif
-#if PIN_EXISTS(MAX6675_CS2) && !PIN_EXISTS(MAX6675_SS2)
-  #define MAX6675_SS2_PIN MAX6675_CS2_PIN
-#endif
-#if PIN_EXISTS(MAX31855_MISO) && !PIN_EXISTS(MAX6675_DO)
-  #define MAX6675_DO_PIN MAX31855_MISO_PIN
-#endif
-#if PIN_EXISTS(MAX6675_MISO) && !PIN_EXISTS(MAX6675_DO)
-  #define MAX6675_DO_PIN MAX6675_MISO_PIN
-#endif
-#if PIN_EXISTS(MAX31855_SCK) && !PIN_EXISTS(MAX6675_SCK)
-  #define MAX6675_SCK_PIN MAX31855_SCK_PIN
-#endif
+  #endif // TEMP_SENSOR_0_IS_MAX_TC
+
+  #if TEMP_SENSOR_1_IS_MAX_TC || (TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 1)
+
+    #if !PIN_EXISTS(TEMP_1_CS) // SS2, CS2
+      #if PIN_EXISTS(MAX6675_SS2)
+        #define TEMP_1_CS_PIN MAX6675_SS2_PIN
+      #elif PIN_EXISTS(MAX6675_CS)
+        #define TEMP_1_CS_PIN MAX6675_CS2_PIN
+      #elif PIN_EXISTS(MAX31855_SS2)
+        #define TEMP_1_CS_PIN MAX31855_SS2_PIN
+      #elif PIN_EXISTS(MAX31855_CS2)
+        #define TEMP_1_CS_PIN MAX31855_CS2_PIN
+      #elif PIN_EXISTS(MAX31865_SS2)
+        #define TEMP_1_CS_PIN MAX31865_SS2_PIN
+      #elif PIN_EXISTS(MAX31865_CS2)
+        #define TEMP_1_CS_PIN MAX31865_CS2_PIN
+      #endif
+    #endif
 
-//
-// User-defined thermocouple libraries
-//
-// Add LIB_MAX6675 / LIB_MAX31855 / LIB_MAX31865 to the build_flags
-// to select a USER library for MAX6675, MAX31855, MAX31865
-//
-#if BOTH(HAS_MAX6675, LIB_MAX6675)
-  #define LIB_USR_MAX6675 1
-#endif
-#if BOTH(HAS_MAX31855, LIB_MAX31855)
-  #define LIB_USR_MAX31855 1
-#endif
-#if HAS_MAX31865
-  #if ENABLED(LIB_MAX31865)
+    #if TEMP_SENSOR_1_IS_MAX6675
+      #if !PIN_EXISTS(TEMP_1_MISO) // DO
+        #if PIN_EXISTS(MAX6675_MISO)
+          #define TEMP_1_MISO_PIN MAX6675_MISO_PIN
+        #elif PIN_EXISTS(MAX6675_DO)
+          #define TEMP_1_MISO_PIN MAX6675_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_1_SCK) && PIN_EXISTS(MAX6675_SCK)
+        #define TEMP_1_SCK_PIN MAX6675_SCK_PIN
+      #endif
+
+    #elif TEMP_SENSOR_1_IS_MAX31855
+      #if !PIN_EXISTS(TEMP_1_MISO) // DO
+        #if PIN_EXISTS(MAX31855_MISO)
+          #define TEMP_1_MISO_PIN MAX31855_MISO_PIN
+        #elif PIN_EXISTS(MAX31855_DO)
+          #define TEMP_1_MISO_PIN MAX31855_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_1_SCK) && PIN_EXISTS(MAX31855_SCK)
+        #define TEMP_1_SCK_PIN MAX31855_SCK_PIN
+      #endif
+
+    #elif TEMP_SENSOR_1_IS_MAX31865
+      #if !PIN_EXISTS(TEMP_1_MISO) // DO
+        #if PIN_EXISTS(MAX31865_MISO)
+          #define TEMP_1_MISO_PIN MAX31865_MISO_PIN
+        #elif PIN_EXISTS(MAX31865_DO)
+          #define TEMP_1_MISO_PIN MAX31865_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_1_SCK) && PIN_EXISTS(MAX31865_SCK)
+        #define TEMP_1_SCK_PIN MAX31865_SCK_PIN
+      #endif
+      #if !PIN_EXISTS(TEMP_1_MOSI) && PIN_EXISTS(MAX31865_MOSI) // MOSI for '65 only
+        #define TEMP_1_MOSI_PIN MAX31865_MOSI_PIN
+      #endif
+    #endif
+
+    // Software SPI - enable if MISO/SCK are defined.
+    #if PIN_EXISTS(TEMP_1_MISO) && PIN_EXISTS(TEMP_1_SCK) && DISABLED(TEMP_SENSOR_1_FORCE_HW_SPI)
+      #if TEMP_SENSOR_1_IS_MAX31865 && !PIN_EXISTS(TEMP_1_MOSI)
+        #error "TEMP_SENSOR_1 MAX31865 requires TEMP_1_MOSI_PIN defined for Software SPI. To use Hardware SPI instead, undefine MISO/SCK or enable TEMP_SENSOR_1_FORCE_HW_SPI."
+      #else
+        #define TEMP_SENSOR_1_HAS_SPI_PINS 1
+      #endif
+    #endif
+
+  #endif // TEMP_SENSOR_1_IS_MAX_TC
+
+  //
+  // User-defined thermocouple libraries
+  //
+  // Add LIB_MAX6675 / LIB_MAX31855 / LIB_MAX31865 to the build_flags
+  // to select a USER library for MAX6675, MAX31855, MAX31865
+  //
+  #if BOTH(HAS_MAX6675, LIB_MAX6675)
+    #define LIB_USR_MAX6675 1
+  #endif
+  #if BOTH(HAS_MAX31855, LIB_MAX31855)
+    #define LIB_USR_MAX31855 1
+  #endif
+  #if BOTH(HAS_MAX31865, LIB_MAX31865)
     #define LIB_USR_MAX31865 1
-  #else
-    #define LIB_ADAFRUIT_MAX31865 1
+  #elif HAS_MAX31865
+    #define LIB_INTERNAL_MAX31865 1
   #endif
-#endif
+
+#endif //HAS_MAX_TC
 
 #if TEMP_SENSOR_2 == -4
   #define TEMP_SENSOR_2_IS_AD8495 1
   #define BED_OR_CHAMBER_OR_FAN 1
 #endif
 
+/**
+ * Up to 3 PWM fans
+ */
+#ifndef FAN_INVERTING
+  #define FAN_INVERTING false
+#endif
+
+#if HAS_FAN7
+  #define FAN_COUNT 8
+#elif HAS_FAN6
+  #define FAN_COUNT 7
+#elif HAS_FAN5
+  #define FAN_COUNT 6
+#elif HAS_FAN4
+  #define FAN_COUNT 5
+#elif HAS_FAN3
+  #define FAN_COUNT 4
+#elif HAS_FAN2
+  #define FAN_COUNT 3
+#elif HAS_FAN1
+  #define FAN_COUNT 2
+#elif HAS_FAN0
+  #define FAN_COUNT 1
+#else
+  #define FAN_COUNT 0
+#endif
+
+#if FAN_COUNT > 0
+  #define HAS_FAN 1
+#endif
+
+/**
+ * Part Cooling fan multipliexer
+ */
+#if PIN_EXISTS(FANMUX0)
+  #define HAS_FANMUX 1
+#endif
+
+/**
+ * MIN/MAX fan PWM scaling
+ */
+#ifndef FAN_OFF_PWM
+  #define FAN_OFF_PWM 0
+#endif
+#ifndef FAN_MIN_PWM
+  #if FAN_OFF_PWM > 0
+    #define FAN_MIN_PWM (FAN_OFF_PWM + 1)
+  #else
+    #define FAN_MIN_PWM 0
+  #endif
+#endif
+#ifndef FAN_MAX_PWM
+  #define FAN_MAX_PWM 255
+#endif
+#if FAN_MIN_PWM < 0 || FAN_MIN_PWM > 255
+  #error "FAN_MIN_PWM must be a value from 0 to 255."
+#elif FAN_MAX_PWM < 0 || FAN_MAX_PWM > 255
+  #error "FAN_MAX_PWM must be a value from 0 to 255."
+#elif FAN_MIN_PWM > FAN_MAX_PWM
+  #error "FAN_MIN_PWM must be less than or equal to FAN_MAX_PWM."
+#elif FAN_OFF_PWM > FAN_MIN_PWM
+  #error "FAN_OFF_PWM must be less than or equal to FAN_MIN_PWM."
+#endif
+
+/**
+ * FAST PWM FAN Settings
+ */
+#if ENABLED(FAST_PWM_FAN) && !defined(FAST_PWM_FAN_FREQUENCY)
+  #define FAST_PWM_FAN_FREQUENCY ((F_CPU) / (2 * 255 * 1)) // Fan frequency default
+#endif
+
 // Servos
 #if PIN_EXISTS(SERVO0) && NUM_SERVOS > 0
   #define HAS_SERVO_0 1
 #endif
 
 /**
- * Up to 3 PWM fans
- */
-#ifndef FAN_INVERTING
-  #define FAN_INVERTING false
-#endif
-
-#if HAS_FAN7
-  #define FAN_COUNT 8
-#elif HAS_FAN6
-  #define FAN_COUNT 7
-#elif HAS_FAN5
-  #define FAN_COUNT 6
-#elif HAS_FAN4
-  #define FAN_COUNT 5
-#elif HAS_FAN3
-  #define FAN_COUNT 4
-#elif HAS_FAN2
-  #define FAN_COUNT 3
-#elif HAS_FAN1
-  #define FAN_COUNT 2
-#elif HAS_FAN0
-  #define FAN_COUNT 1
-#else
-  #define FAN_COUNT 0
-#endif
-
-#if FAN_COUNT > 0
-  #define HAS_FAN 1
-#endif
-
-/**
- * Part Cooling fan multipliexer
- */
-#if PIN_EXISTS(FANMUX0)
-  #define HAS_FANMUX 1
-#endif
-
-/**
- * MIN/MAX fan PWM scaling
- */
-#ifndef FAN_OFF_PWM
-  #define FAN_OFF_PWM 0
-#endif
-#ifndef FAN_MIN_PWM
-  #if FAN_OFF_PWM > 0
-    #define FAN_MIN_PWM (FAN_OFF_PWM + 1)
-  #else
-    #define FAN_MIN_PWM 0
-  #endif
-#endif
-#ifndef FAN_MAX_PWM
-  #define FAN_MAX_PWM 255
-#endif
-#if FAN_MIN_PWM < 0 || FAN_MIN_PWM > 255
-  #error "FAN_MIN_PWM must be a value from 0 to 255."
-#elif FAN_MAX_PWM < 0 || FAN_MAX_PWM > 255
-  #error "FAN_MAX_PWM must be a value from 0 to 255."
-#elif FAN_MIN_PWM > FAN_MAX_PWM
-  #error "FAN_MIN_PWM must be less than or equal to FAN_MAX_PWM."
-#elif FAN_OFF_PWM > FAN_MIN_PWM
-  #error "FAN_OFF_PWM must be less than or equal to FAN_MIN_PWM."
-#endif
-
-/**
- * FAST PWM FAN Settings
- */
-#if ENABLED(FAST_PWM_FAN) && !defined(FAST_PWM_FAN_FREQUENCY)
-  #define FAST_PWM_FAN_FREQUENCY ((F_CPU) / (2 * 255 * 1)) // Fan frequency default
-#endif
-
-/**
  * MIN/MAX case light PWM scaling
  */
 #if ENABLED(CASE_LIGHT_ENABLE)

Marlin/src/inc/SanityCheck.h

   #error "MBL_Z_STEP is now MESH_EDIT_Z_STEP."
 #elif defined(CHDK)
   #error "CHDK is now CHDK_PIN."
-#elif defined(MAX6675_SS) || defined(MAX6675_SS2)
-  #error "MAX6675_SS / MAX6675_SS2 is now MAX6675_SS_PIN / MAX6675_SS2_PIN."
+#elif ANY_PIN( \
+        MAX6675_SS, MAX6675_SS2, MAX6675_CS, MAX6675_CS2, \
+        MAX31855_SS, MAX31855_SS2, MAX31855_CS, MAX31855_CS2, \
+        MAX31865_SS, MAX31865_SS2, MAX31865_CS, MAX31865_CS2)
+  #warning "MAX*_SS_PIN, MAX*_SS2_PIN, MAX*_CS_PIN, and MAX*_CS2_PIN are deprecated and will be removed in a future version. Please use TEMP_0_CS_PIN/TEMP_1_CS_PIN instead."
+#elif ANY_PIN(MAX6675_SCK, MAX31855_SCK, MAX31865_SCK)
+  #warning "MAX*_SCK_PIN is deprecated and will be removed in a future version. Please use TEMP_0_SCK_PIN/TEMP_1_SCK_PIN instead."
+#elif ANY_PIN(MAX6675_MISO, MAX6675_DO, MAX31855_MISO, MAX31855_DO, MAX31865_MISO, MAX31865_DO)
+  #warning "MAX*_MISO_PIN and MAX*_DO_PIN are deprecated and will be removed in a future version. Please use TEMP_0_MISO_PIN/TEMP_1_MISO_PIN instead."
+#elif PIN_EXISTS(MAX31865_MOSI)
+  #warning "MAX31865_MOSI_PIN is deprecated and will be removed in a future version. Please use TEMP_0_MOSI_PIN/TEMP_1_MOSI_PIN instead."
+#elif ANY_PIN(THERMO_CS1_PIN, THERMO_CS2_PIN, THERMO_DO_PIN, THERMO_SCK_PIN)
+  #error "THERMO_*_PIN is now TEMP_n_CS_PIN, TEMP_n_SCK_PIN, TEMP_n_MOSI_PIN, TEMP_n_MISO_PIN."
 #elif defined(MAX31865_SENSOR_OHMS)
   #error "MAX31865_SENSOR_OHMS is now MAX31865_SENSOR_OHMS_0."
 #elif defined(MAX31865_CALIBRATION_OHMS)
 #endif
 
 /**
- * Pins and Sensor IDs must be set for each heater
+ * Required MAX31865 settings
  */
-#if TEMP_SENSOR_0_IS_MAX6675 && !ANY_PIN(MAX6675_SS, MAX31855_CS, MAX31865_CS, MAX6675_CS)
-  #error "TEMP_SENSOR_0 -2 requires a MAX6675_SS_PIN, MAX6675_CS_PIN, MAX31855_CS_PIN, or MAX31865_CS_PIN."
-#elif HAS_HOTEND && !HAS_TEMP_HOTEND && !TEMP_SENSOR_0_IS_DUMMY
-  #error "TEMP_0_PIN (required for TEMP_SENSOR_0) not defined for this board."
-#elif EITHER(HAS_MULTI_HOTEND, HEATERS_PARALLEL) && !HAS_HEATER_1
-  #error "HEATER_1_PIN is not defined. TEMP_SENSOR_1 might not be set, or the board (not EEB / EEF?) doesn't define a pin."
+#if TEMP_SENSOR_0_IS_MAX31865 || (TEMP_SENSOR_REDUNDANT_IS_MAX31865 && TEMP_SENSOR_REDUNDANT_SOURCE == 0)
+  #if !defined(MAX31865_SENSOR_WIRES_0) || !WITHIN(MAX31865_SENSOR_WIRES_0, 2, 4)
+    #error "MAX31865_SENSOR_WIRES_0 must be defined as an integer between 2 and 4."
+  #elif !defined(MAX31865_SENSOR_OHMS_0) || !defined(MAX31865_CALIBRATION_OHMS_0)
+    #error "MAX31865_SENSOR_OHMS_0 and MAX31865_CALIBRATION_OHMS_0 must be set if TEMP_SENSOR_0/TEMP_SENSOR_REDUNDANT is MAX31865."
+  #endif
+#endif
+#if TEMP_SENSOR_1_IS_MAX31865 || (TEMP_SENSOR_REDUNDANT_IS_MAX31865 && TEMP_SENSOR_REDUNDANT_SOURCE == 1)
+  #if !defined(MAX31865_SENSOR_WIRES_1) || !WITHIN(MAX31865_SENSOR_WIRES_1, 2, 4)
+    #error "MAX31865_SENSOR_WIRES_1 must be defined as an integer between 2 and 4."
+  #elif !defined(MAX31865_SENSOR_OHMS_1) || !defined(MAX31865_CALIBRATION_OHMS_1)
+    #error "MAX31865_SENSOR_OHMS_1 and MAX31865_CALIBRATION_OHMS_1 must be set if TEMP_SENSOR_1/TEMP_SENSOR_REDUNDANT is MAX31865."
+  #endif
 #endif
 
 /**
     #error "TEMP_SENSOR_REDUNDANT_TARGET can't be Cooler (-5): requires TEMP_COOLER_PIN"
   #endif
 
-  #if TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 0 && !PIN_EXISTS(MAX6675_SS)
-    #error "TEMP_SENSOR_REDUNDANT MAX Thermocouple with TEMP_SENSOR_REDUNDANT_SOURCE 0 requires a MAX6675_SS_PIN, MAX6675_CS_PIN, MAX31855_CS_PIN, or MAX31865_CS_PIN."
-  #elif TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 1 && !PIN_EXISTS(MAX6675_SS2)
-    #error "TEMP_SENSOR_REDUNDANT MAX Thermocouple with TEMP_SENSOR_REDUNDANT_SOURCE 1 requires a MAX6675_SS2_PIN, MAX6675_CS_PIN, MAX31855_CS_PIN, or MAX31865_CS_PIN."
+  #if TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 0 && !PIN_EXISTS(TEMP_0_CS)
+    #error "TEMP_SENSOR_REDUNDANT MAX Thermocouple with TEMP_SENSOR_REDUNDANT_SOURCE 0 requires TEMP_0_CS_PIN."
+  #elif TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 1 && !PIN_EXISTS(TEMP_1_CS)
+    #error "TEMP_SENSOR_REDUNDANT MAX Thermocouple with TEMP_SENSOR_REDUNDANT_SOURCE 1 requires TEMP_1_CS_PIN."
   #endif
 #endif
 
+/**
+ * Test Sensor & Heater pin combos.
+ * Pins and Sensor IDs must be set for each heater
+ */
+#if !ANY_PIN(TEMP_0, TEMP_0_CS)
+  #error "TEMP_0_PIN or TEMP_0_CS_PIN not defined for this board."
+#elif !HAS_HEATER_0 && EXTRUDERS
+  #error "HEATER_0_PIN not defined for this board."
+#elif TEMP_SENSOR_0_IS_MAX_TC && !PIN_EXISTS(TEMP_0_CS)
+  #error "TEMP_SENSOR_0 MAX thermocouple requires TEMP_0_CS_PIN."
+#elif HAS_HOTEND && !HAS_TEMP_HOTEND && !TEMP_SENSOR_0_IS_DUMMY
+  #error "TEMP_0_PIN (required for TEMP_SENSOR_0) not defined for this board."
+#elif EITHER(HAS_MULTI_HOTEND, HEATERS_PARALLEL) && !HAS_HEATER_1
+  #error "HEATER_1_PIN is not defined. TEMP_SENSOR_1 might not be set, or the board (not EEB / EEF?) doesn't define a pin."
+#endif
+
 #if HAS_MULTI_HOTEND
-  #if TEMP_SENSOR_1_IS_MAX6675 && !ANY_PIN(MAX6675_SS2, MAX31855_CS2, MAX31865_CS2, MAX6675_CS2)
-    #error "TEMP_SENSOR_1 requires a MAX6675_SS2_PIN, MAX6675_CS2_PIN, MAX31855_CS2_PIN, or MAX31865_CS2_PIN."
+  #if TEMP_SENSOR_1_IS_MAX_TC && !PIN_EXISTS(TEMP_1_CS)
+    #error "TEMP_SENSOR_1 MAX thermocouple requires TEMP_1_CS_PIN."
   #elif TEMP_SENSOR_1 == 0
     #error "TEMP_SENSOR_1 is required with 2 or more HOTENDS."
-  #elif !ANY_PIN(TEMP_1, MAX6675_SS2) && !TEMP_SENSOR_1_IS_DUMMY
-    #error "TEMP_1_PIN or MAX6675_SS2_PIN not defined for this board."
+  #elif !ANY_PIN(TEMP_1, TEMP_1_CS) && !TEMP_SENSOR_1_IS_DUMMY
+    #error "TEMP_1_PIN or TEMP_1_CS_PIN not defined for this board."
   #endif
   #if HOTENDS > 2
     #if TEMP_SENSOR_2 == 0
   #error "TEMP_SENSOR_6 shouldn't be set with only 1 HOTEND."
 #elif TEMP_SENSOR_7 != 0
   #error "TEMP_SENSOR_7 shouldn't be set with only 1 HOTEND."
-#endif
+#endif // HAS_MULTI_HOTEND
 
+/**
+ * Pins must be set for temp sensors, with some other feature requirements.
+ */
 #if TEMP_SENSOR_CHAMBER && !PIN_EXISTS(TEMP_CHAMBER)
   #error "TEMP_SENSOR_CHAMBER requires TEMP_CHAMBER_PIN."
 #endif
 
-#if TEMP_SENSOR_COOLER && !(PIN_EXISTS(TEMP_COOLER) && ENABLED(LASER_FEATURE))
-  #error "TEMP_SENSOR_COOLER requires LASER_FEATURE and TEMP_COOLER_PIN."
+#if TEMP_SENSOR_COOLER
+  #if !PIN_EXISTS(TEMP_COOLER)
+    #error "TEMP_SENSOR_COOLER requires TEMP_COOLER_PIN."
+  #elif DISABLED(LASER_FEATURE)
+    #error "TEMP_SENSOR_COOLER requires LASER_FEATURE."
+  #endif
+#endif
+
+#if TEMP_SENSOR_PROBE
+  #if !PIN_EXISTS(TEMP_PROBE)
+    #error "TEMP_SENSOR_PROBE requires TEMP_PROBE_PIN."
+  #elif !HAS_TEMP_ADC_PROBE
+    #error "TEMP_PROBE_PIN must be an ADC pin."
+  #elif DISABLED(FIX_MOUNTED_PROBE)
+    #error "TEMP_SENSOR_PROBE shouldn't be set without FIX_MOUNTED_PROBE."
+  #endif
 #endif
 
 #if ENABLED(LASER_COOLANT_FLOW_METER) && !(PIN_EXISTS(FLOWMETER) && ENABLED(LASER_FEATURE))
   #endif
 #endif
 
-#if TEMP_SENSOR_PROBE
-  #if !PIN_EXISTS(TEMP_PROBE)
-    #error "TEMP_SENSOR_PROBE requires TEMP_PROBE_PIN."
-  #elif !HAS_TEMP_ADC_PROBE
-    #error "TEMP_PROBE_PIN must be an ADC pin."
-  #elif DISABLED(FIX_MOUNTED_PROBE)
-    #error "TEMP_SENSOR_PROBE shouldn't be set without FIX_MOUNTED_PROBE."
-  #endif
-#endif
-
-#if TEMP_SENSOR_IS_MAX(0, MAX31865) && !(defined(MAX31865_SENSOR_OHMS_0) && defined(MAX31865_CALIBRATION_OHMS_0))
-  #error "MAX31865_SENSOR_OHMS_0 and MAX31865_CALIBRATION_OHMS_0 must be set if TEMP_SENSOR_0/TEMP_SENSOR_REDUNDANT is MAX31865."
-#elif TEMP_SENSOR_IS_MAX(1, MAX31865) && !(defined(MAX31865_SENSOR_OHMS_1) && defined(MAX31865_CALIBRATION_OHMS_1))
-  #error "MAX31865_SENSOR_OHMS_1 and MAX31865_CALIBRATION_OHMS_1 must be set if TEMP_SENSOR_1/TEMP_SENSOR_REDUNDANT is MAX31865."
-#endif
-
-/**
- * Test Heater, Temp Sensor, and Extruder Pins
- */
-#if !HAS_HEATER_0 && EXTRUDERS
-  #error "HEATER_0_PIN not defined for this board."
-#elif !ANY_PIN(TEMP_0, MAX6675_SS)
-  #error "TEMP_0_PIN or MAX6675_SS not defined for this board."
-#endif
-
-#if HAS_EXTRUDERS
-  #if ((defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)) && !PINS_EXIST(E0_STEP, E0_DIR))
-    #error "E0_STEP_PIN or E0_DIR_PIN not defined for this board."
-  #elif ( !(defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)) && (!PINS_EXIST(E0_STEP, E0_DIR) || !HAS_E0_ENABLE))
-    #error "E0_STEP_PIN, E0_DIR_PIN, or E0_ENABLE_PIN not defined for this board."
-  #elif EXTRUDERS && TEMP_SENSOR_0 == 0
-    #error "TEMP_SENSOR_0 is required if there are any extruders."
-  #endif
-#endif
-
 /**
  * Temperature status LEDs
  */
 /**
  * Test Extruder Stepper Pins
  */
+#if HAS_EXTRUDERS
+  #if ((defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)) && !PINS_EXIST(E0_STEP, E0_DIR))
+    #error "E0_STEP_PIN or E0_DIR_PIN not defined for this board."
+  #elif ( !(defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)) && (!PINS_EXIST(E0_STEP, E0_DIR) || !HAS_E0_ENABLE))
+    #error "E0_STEP_PIN, E0_DIR_PIN, or E0_ENABLE_PIN not defined for this board."
+  #elif EXTRUDERS && TEMP_SENSOR_0 == 0
+    #error "TEMP_SENSOR_0 is required if there are any extruders."
+  #endif
+#endif
+
 #if E_STEPPERS
   #if !(PINS_EXIST(E0_STEP, E0_DIR) && HAS_E0_ENABLE)
     #error "E0_STEP_PIN, E0_DIR_PIN, or E0_ENABLE_PIN not defined for this board."

Marlin/src/libs/MAX31865.cpp

+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Based on Based on Adafruit MAX31865 library:
+ *
+ * This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865
+ * Designed specifically to work with the Adafruit RTD Sensor
+ * https://www.adafruit.com/products/3328
+ *
+ * This sensor uses SPI to communicate, 4 pins are required to interface.
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Limor Fried/Ladyada for Adafruit Industries.
+ *
+ * Modifications by JoAnn Manges (@GadgetAngel)
+ * Copyright (c) 2020, JoAnn Manges
+ * All rights reserved.
+ */
+
+// Useful for RTD debugging.
+//#define MAX31865_DEBUG
+//#define MAX31865_DEBUG_SPI
+
+//TODO: switch to SPIclass/SoftSPI
+
+#include "../inc/MarlinConfig.h"
+
+#if HAS_MAX31865 && !LIB_USR_MAX31865
+
+#include "MAX31865.h"
+
+// The maximum speed the MAX31865 can do is 5 MHz
+SPISettings MAX31865::spiConfig = SPISettings(
+  #if defined(TARGET_LPC1768)
+    SPI_QUARTER_SPEED
+  #elif defined(ARDUINO_ARCH_STM32)
+    SPI_CLOCK_DIV4
+  #else
+    500000
+  #endif
+  , MSBFIRST
+  , SPI_MODE_1 // CPOL0 CPHA1
+);
+
+#ifndef LARGE_PINMAP
+
+  /**
+   * Create the interface object using software (bitbang) SPI for PIN values
+   * less than or equal to 127.
+   *
+   * @param spi_cs    the SPI CS pin to use
+   * @param spi_mosi  the SPI MOSI pin to use
+   * @param spi_miso  the SPI MISO pin to use
+   * @param spi_clk   the SPI clock pin to use
+  */
+  MAX31865::MAX31865(int8_t spi_cs, int8_t spi_mosi, int8_t spi_miso, int8_t spi_clk) {
+    _cs = spi_cs;
+    _mosi = spi_mosi;
+    _miso = spi_miso;
+    _sclk = spi_clk;
+  }
+
+  /**
+   * Create the interface object using hardware SPI for PIN for PIN values less
+   * than or equal to 127.
+   *
+   * @param spi_cs  the SPI CS pin to use along with the default SPI device
+   */
+  MAX31865::MAX31865(int8_t spi_cs) {
+    _cs = spi_cs;
+    _sclk = _miso = _mosi = -1;
+  }
+
+#else
+
+  /**
+   * Create the interface object using software (bitbang) SPI for PIN values
+   * which are larger than 127. If you have PIN values less than or equal to
+   * 127 use the other call for SW SPI.
+   *
+   * @param spi_cs       the SPI CS pin to use
+   * @param spi_mosi     the SPI MOSI pin to use
+   * @param spi_miso     the SPI MISO pin to use
+   * @param spi_clk      the SPI clock pin to use
+   * @param pin_mapping  set to 1 for positive pin values
+   */
+  MAX31865::MAX31865(uint32_t spi_cs, uint32_t spi_mosi,
+                     uint32_t spi_miso, uint32_t spi_clk,
+                     uint8_t pin_mapping) {
+    _cs = spi_cs;
+    _mosi = spi_mosi;
+    _miso = spi_miso;
+    _sclk = spi_clk;
+  }
+
+  /**
+   * Create the interface object using hardware SPI for PIN values which are
+   * larger than 127. If you have PIN values less than or equal to 127 use
+   * the other call for HW SPI.
+   *
+   * @param spi_cs       the SPI CS pin to use along with the default SPI device
+   * @param pin_mapping  set to 1 for positive pin values
+   */
+  MAX31865::MAX31865(uint32_t spi_cs, uint8_t pin_mapping) {
+    _cs = spi_cs;
+    _sclk = _miso = _mosi = -1UL;  //-1UL or 0xFFFFFFFF or 4294967295
+  }
+
+#endif // LARGE_PINMAP
+
+
+/**
+ *
+ * Instance & Class methods
+ *
+ */
+
+
+/**
+ * Initialize the SPI interface and set the number of RTD wires used
+ *
+ * @param wires  The number of wires in enum format. Can be MAX31865_2WIRE, MAX31865_3WIRE, or MAX31865_4WIRE.
+ * @param zero   The resistance of the RTD at 0 degC, in ohms.
+ * @param ref    The resistance of the reference resistor, in ohms.
+ */
+void MAX31865::begin(max31865_numwires_t wires, float zero, float ref) {
+  Rzero = zero;
+  Rref = ref;
+
+  OUT_WRITE(_cs, HIGH);
+
+  if (_sclk != TERN(LARGE_PINMAP, -1UL, -1)) {
+    // define pin modes for Software SPI
+    #ifdef MAX31865_DEBUG
+      SERIAL_ECHOLN("Initializing MAX31865 Software SPI");
+    #endif
+
+    OUT_WRITE(_sclk, LOW);
+    SET_OUTPUT(_mosi);
+    SET_INPUT(_miso);
+  } else {
+    // start and configure hardware SPI
+    #ifdef MAX31865_DEBUG
+      SERIAL_ECHOLN("Initializing MAX31865 Hardware SPI");
+    #endif
+
+    SPI.begin();
+  }
+
+  setWires(wires);
+  enableBias(false);
+  autoConvert(false);
+  clearFault();
+
+  #ifdef MAX31865_DEBUG_SPI
+    #ifndef LARGE_PINMAP
+      SERIAL_ECHOLNPAIR(
+        "Regular begin call with _cs: ", _cs,
+        " _miso: ", _miso,
+        " _sclk: ", _sclk,
+        " _mosi: ", _mosi
+      );
+    #else
+      SERIAL_ECHOLNPAIR(
+        "LARGE_PINMAP begin call with _cs: ", _cs,
+        " _miso: ", _miso,
+        " _sclk: ", _sclk,
+        " _mosi: ", _mosi
+      );
+    #endif // LARGE_PINMAP
+
+    SERIAL_ECHOLNPAIR("config: ", readRegister8(MAX31856_CONFIG_REG));
+    SERIAL_EOL();
+  #endif // MAX31865_DEBUG_SPI
+}
+
+/**
+ * Read the raw 8-bit FAULTSTAT register
+ *
+ * @return The raw unsigned 8-bit FAULT status register
+ */
+uint8_t MAX31865::readFault() {
+  return readRegister8(MAX31856_FAULTSTAT_REG);
+}
+
+/**
+ * Clear all faults in FAULTSTAT.
+ */
+void MAX31865::clearFault() {
+  setConfig(MAX31856_CONFIG_FAULTSTAT, 1);
+}
+
+/**
+ * Whether we want to have continuous conversions (50/60 Hz)
+ *
+ * @param b  If true, auto conversion is enabled
+ */
+void MAX31865::autoConvert(bool b) {
+  setConfig(MAX31856_CONFIG_MODEAUTO, b);
+}
+
+/**
+ * Whether we want filter out 50Hz noise or 60Hz noise
+ *
+ * @param b  If true, 50Hz noise is filtered, else 60Hz(default)
+ */
+void MAX31865::enable50HzFilter(bool b) {
+  setConfig(MAX31856_CONFIG_FILT50HZ, b);
+}
+
+/**
+ * Enable the bias voltage on the RTD sensor
+ *
+ * @param b  If true bias is enabled, else disabled
+ */
+void MAX31865::enableBias(bool b) {
+  setConfig(MAX31856_CONFIG_BIAS, b);
+
+  // From the datasheet:
+  // Note that if VBIAS is off (to reduce supply current between conversions), any filter
+  // capacitors at the RTDIN inputs need to charge before an accurate conversion can be
+  // performed. Therefore, enable VBIAS and wait at least 10.5 time constants of the input
+  // RC network plus an additional 1ms before initiating the conversion.
+  if (b)
+    DELAY_US(11500); //11.5ms
+}
+
+/**
+ * Start a one-shot temperature reading.
+ */
+void MAX31865::oneShot() {
+  setConfig(MAX31856_CONFIG_1SHOT, 1);
+
+  // From the datasheet:
+  // Note that a single conversion requires approximately 52ms in 60Hz filter
+  // mode or 62.5ms in 50Hz filter mode to complete. 1-Shot is a self-clearing bit.
+  // TODO: switch this out depeding on the filter mode.
+  DELAY_US(65000); // 65ms
+}
+
+/**
+ * How many wires we have in our RTD setup, can be MAX31865_2WIRE,
+ * MAX31865_3WIRE, or MAX31865_4WIRE
+ *
+ * @param wires The number of wires in enum format
+ */
+void MAX31865::setWires(max31865_numwires_t wires) {
+  uint8_t t = readRegister8(MAX31856_CONFIG_REG);
+  if (wires == MAX31865_3WIRE)
+    t |= MAX31856_CONFIG_3WIRE;
+  else // 2 or 4 wire
+    t &= ~MAX31856_CONFIG_3WIRE;
+  writeRegister8(MAX31856_CONFIG_REG, t);
+}
+
+/**
+ * Read the raw 16-bit value from the RTD_REG in one shot mode. This will include
+ * the fault bit, D0.
+ *
+ * @return The raw unsigned 16-bit register value with ERROR bit attached, NOT temperature!
+ */
+uint16_t MAX31865::readRaw() {
+  clearFault();
+  enableBias(true);
+
+  oneShot();
+  uint16_t rtd = readRegister16(MAX31856_RTDMSB_REG);
+
+  #ifdef MAX31865_DEBUG
+    SERIAL_ECHOLNPAIR("RTD MSB:", (rtd >> 8), "  RTD LSB:", (rtd & 0x00FF));
+  #endif
+
+  // Disable the bias to lower power dissipation between reads.
+  // If the ref resistor heats up, the temperature reading will be skewed.
+  enableBias(false);
+
+  return rtd;
+}
+
+/**
+ * Calulate and return the resistance value of the connected RTD.
+ *
+ * @param  refResistor The value of the matching reference resistor, usually 430 or 4300
+ * @return             The raw RTD resistance value, NOT temperature!
+ */
+float MAX31865::readResistance() {
+  // Strip the error bit (D0) and convert to a float ratio.
+  // less precise method: (readRaw() * Rref) >> 16
+  return (((readRaw() >> 1) / 32768.0f) * Rref);
+}
+
+/**
+ * Read the RTD and pass it to temperature(float) for calculation.
+ *
+ * @return  Temperature in C
+ */
+float MAX31865::temperature() {
+  return temperature(readResistance());
+}
+
+/**
+ * Given the 15-bit ADC value, calculate the resistance and pass it to temperature(float) for calculation.
+ *
+ * @return  Temperature in C
+ */
+float MAX31865::temperature(uint16_t adcVal) {
+  return temperature(((adcVal) / 32768.0f) * Rref);
+}
+
+/**
+ * Calculate the temperature in C from the RTD resistance.
+ * Uses the technique outlined in this PDF:
+ * http://www.analog.com/media/en/technical-documentation/application-notes/AN709_0.pdf
+ *
+ * @param    Rrtd  the resistance value in ohms
+ * @return         the temperature in degC
+ */
+float MAX31865::temperature(float Rrtd) {
+  float temp = (RTD_Z1 + sqrt(RTD_Z2 + (RTD_Z3 * Rrtd))) / RTD_Z4;
+
+  // From the PDF...
+  //
+  // The previous equation is valid only for temperatures of 0°C and above.
+  // The equation for RRTD(t) that defines negative temperature behavior is a
+  // fourth-order polynomial (after expanding the third term) and is quite
+  // impractical to solve for a single expression of temperature as a function
+  // of resistance.
+  //
+  if (temp < 0) {
+    Rrtd = (Rrtd / Rzero) * 100; // normalize to 100 ohm
+    float rpoly = Rrtd;
+
+    temp = -242.02 + (2.2228 * rpoly);
+    rpoly *= Rrtd; // square
+    temp += 2.5859e-3 * rpoly;
+    rpoly *= Rrtd; // ^3
+    temp -= 4.8260e-6 * rpoly;
+    rpoly *= Rrtd; // ^4
+    temp -= 2.8183e-8 * rpoly;
+    rpoly *= Rrtd; // ^5
+    temp += 1.5243e-10 * rpoly;
+  }
+
+  return temp;
+}
+
+//
+// private:
+//
+
+
+/**
+ * Set a value in the configuration register.
+ *
+ * @param config  8-bit value for the config item
+ * @param enable  whether to enable or disable the value
+ */
+void MAX31865::setConfig(uint8_t config, bool enable) {
+  uint8_t t = readRegister8(MAX31856_CONFIG_REG);
+  if (enable)
+    t |= config;
+  else
+    t &= ~config; // disable
+  writeRegister8(MAX31856_CONFIG_REG, t);
+}
+
+/**
+ * Read a single byte from the specified register address.
+ *
+ * @param  addr  the register address
+ * @return       the register contents
+ */
+uint8_t MAX31865::readRegister8(uint8_t addr) {
+  uint8_t ret = 0;
+  readRegisterN(addr, &ret, 1);
+
+  return ret;
+}
+
+/**
+ * Read two bytes: 1 from the specified register address, and 1 from the next address.
+ *
+ * @param  addr  the first register address
+ * @return       both register contents as a single 16-bit int
+ */
+uint16_t MAX31865::readRegister16(uint8_t addr) {
+  uint8_t buffer[2] = {0, 0};
+  readRegisterN(addr, buffer, 2);
+
+  uint16_t ret = buffer[0];
+  ret <<= 8;
+  ret |= buffer[1];
+
+  return ret;
+}
+
+/**
+ * Read +n+ bytes from a specified address into +buffer+. Set D7 to 0 to specify a read.
+ *
+ * @param addr    the first register address
+ * @param buffer  storage for the read bytes
+ * @param n       the number of bytes to read
+ */
+void MAX31865::readRegisterN(uint8_t addr, uint8_t buffer[], uint8_t n) {
+  addr &= 0x7F; // make sure top bit is not set
+  if (_sclk == TERN(LARGE_PINMAP, -1UL, -1))
+    SPI.beginTransaction(spiConfig);
+  else
+    WRITE(_sclk, LOW);
+
+  WRITE(_cs, LOW);
+  spixfer(addr);
+
+  while (n--) {
+    buffer[0] = spixfer(0xFF);
+    #ifdef MAX31865_DEBUG_SPI
+      SERIAL_ECHOLNPAIR("buffer read ", n, " data: ", buffer[0]);
+    #endif
+    buffer++;
+  }
+
+  if (_sclk == TERN(LARGE_PINMAP, -1UL, -1))
+    SPI.endTransaction();
+
+  WRITE(_cs, HIGH);
+}
+
+/**
+ * Write an 8-bit value to a register. Set D7 to 1 to specify a write.
+ *
+ * @param addr  the address to write to
+ * @param data  the data to write
+ */
+void MAX31865::writeRegister8(uint8_t addr, uint8_t data) {
+  if (_sclk == TERN(LARGE_PINMAP, -1UL, -1))
+    SPI.beginTransaction(spiConfig);
+  else
+    WRITE(_sclk, LOW);
+
+  WRITE(_cs, LOW);
+
+  spixfer(addr | 0x80); // make sure top bit is set
+  spixfer(data);
+
+  if (_sclk == TERN(LARGE_PINMAP, -1UL, -1))
+    SPI.endTransaction();
+
+  WRITE(_cs, HIGH);
+}
+
+/**
+ * Transfer SPI data +x+ and read the response. From the datasheet...
+ * Input data (SDI) is latched on the internal strobe edge and output data (SDO) is
+ * shifted out on the shift edge. There is one clock for each bit transferred.
+ * Address and data bits are transferred in groups of eight, MSB first.
+ *
+ * @param  x  an 8-bit chunk of data to write
+ * @return    the 8-bit response
+ */
+uint8_t MAX31865::spixfer(uint8_t x) {
+  if (_sclk == TERN(LARGE_PINMAP, -1UL, -1))
+    return SPI.transfer(x);
+
+  uint8_t reply = 0;
+  for (int i = 7; i >= 0; i--) {
+    reply <<= 1;
+    WRITE(_sclk, HIGH);
+    WRITE(_mosi, x & (1 << i));
+    WRITE(_sclk, LOW);
+    if (READ(_miso))
+      reply |= 1;
+  }
+
+  return reply;
+}
+
+#endif // HAS_MAX31865 && !LIB_USR_MAX31865

Marlin/src/libs/MAX31865.h

+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Based on Adafruit MAX31865 library:
+ *
+ * This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865
+ * Designed specifically to work with the Adafruit RTD Sensor
+ * https://www.adafruit.com/products/3328
+ *
+ * This sensor uses SPI to communicate, 4 pins are required to interface.
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Limor Fried/Ladyada for Adafruit Industries.
+ *
+ * Modifications by JoAnn Manges (@GadgetAngel)
+ * Copyright (c) 2020, JoAnn Manges
+ * All rights reserved.
+ */
+#pragma once
+
+#include "../inc/MarlinConfig.h"
+#include "../HAL/shared/Delay.h"
+#include HAL_PATH(../HAL, MarlinSPI.h)
+
+#define MAX31856_CONFIG_REG 0x00
+#define MAX31856_CONFIG_BIAS 0x80
+#define MAX31856_CONFIG_MODEAUTO 0x40
+#define MAX31856_CONFIG_MODEOFF 0x00
+#define MAX31856_CONFIG_1SHOT 0x20
+#define MAX31856_CONFIG_3WIRE 0x10
+#define MAX31856_CONFIG_24WIRE 0x00
+#define MAX31856_CONFIG_FAULTSTAT 0x02
+#define MAX31856_CONFIG_FILT50HZ 0x01
+#define MAX31856_CONFIG_FILT60HZ 0x00
+
+#define MAX31856_RTDMSB_REG 0x01
+#define MAX31856_RTDLSB_REG 0x02
+#define MAX31856_HFAULTMSB_REG 0x03
+#define MAX31856_HFAULTLSB_REG 0x04
+#define MAX31856_LFAULTMSB_REG 0x05
+#define MAX31856_LFAULTLSB_REG 0x06
+#define MAX31856_FAULTSTAT_REG 0x07
+
+#define MAX31865_FAULT_HIGHTHRESH 0x80  // D7
+#define MAX31865_FAULT_LOWTHRESH 0x40   // D6
+#define MAX31865_FAULT_REFINLOW 0x20    // D5
+#define MAX31865_FAULT_REFINHIGH 0x10   // D4
+#define MAX31865_FAULT_RTDINLOW 0x08    // D3
+#define MAX31865_FAULT_OVUV 0x04        // D2
+
+// http://www.analog.com/media/en/technical-documentation/application-notes/AN709_0.pdf
+// constants for calulating temperature from the measured RTD resistance.
+#define RTD_Z1 -0.0039083
+#define RTD_Z2 0.00001758480889
+#define RTD_Z3 -0.0000000231
+#define RTD_Z4 -0.000001155
+
+typedef enum max31865_numwires {
+  MAX31865_2WIRE = 0,
+  MAX31865_3WIRE = 1,
+  MAX31865_4WIRE = 0
+} max31865_numwires_t;
+
+/* Interface class for the MAX31865 RTD Sensor reader */
+class MAX31865 {
+private:
+  static SPISettings spiConfig;
+
+  TERN(LARGE_PINMAP, uint32_t, uint8_t) _sclk, _miso, _mosi, _cs;
+  float Rzero, Rref;
+
+  void setConfig(uint8_t config, bool enable);
+
+  void readRegisterN(uint8_t addr, uint8_t buffer[], uint8_t n);
+  uint8_t readRegister8(uint8_t addr);
+  uint16_t readRegister16(uint8_t addr);
+
+  void writeRegister8(uint8_t addr, uint8_t reg);
+  uint8_t spixfer(uint8_t addr);
+
+public:
+  #ifdef LARGE_PINMAP
+    MAX31865(uint32_t spi_cs, uint8_t pin_mapping);
+    MAX31865(uint32_t spi_cs, uint32_t spi_mosi, uint32_t spi_miso,
+             uint32_t spi_clk, uint8_t pin_mapping);
+  #else
+    MAX31865(int8_t spi_cs);
+    MAX31865(int8_t spi_cs, int8_t spi_mosi, int8_t spi_miso,
+             int8_t spi_clk);
+  #endif
+
+  void begin(max31865_numwires_t wires, float zero, float ref);
+
+  uint8_t readFault();
+  void clearFault();
+
+  void setWires(max31865_numwires_t wires);
+  void autoConvert(bool b);
+  void enable50HzFilter(bool b);
+  void enableBias(bool b);
+  void oneShot();
+
+  uint16_t readRaw();
+  float readResistance();
+  float temperature();
+  float temperature(uint16_t adcVal);
+  float temperature(float Rrtd);
+};

Marlin/src/module/motion.cpp

    * at the same positions relative to the machine.
    */
   void update_software_endstops(const AxisEnum axis
-    OPTARG(HAS_HOTEND_OFFSET, const uint8_t old_tool_index/*=0*/)
-    OPTARG(HAS_HOTEND_OFFSET, const uint8_t new_tool_index/*=0*/)
+    OPTARG(HAS_HOTEND_OFFSET, const uint8_t old_tool_index/*=0*/, const uint8_t new_tool_index/*=0*/)
   ) {
 
     #if ENABLED(DUAL_X_CARRIAGE)

Marlin/src/module/temperature.cpp

 #include "temperature.h"
 #include "endstops.h"
 #include "planner.h"
+#include "printcounter.h"
 
 #if EITHER(HAS_COOLER, LASER_COOLANT_FLOW_METER)
   #include "../feature/cooler.h"
   #include "../feature/host_actions.h"
 #endif
 
-#define TEMP_SENSOR_IS_ANY_MAX_TC(n) (ENABLED(TEMP_SENSOR_##n##_IS_MAX_TC) || (ENABLED(TEMP_SENSOR_REDUNDANT_IS_MAX_TC) && ENABLED(TEMP_SENSOR_REDUNDANT_SOURCE) && TEMP_SENSOR_REDUNDANT_SOURCE == n))
+// MAX TC related macros
+#define TEMP_SENSOR_IS_MAX(n, M) (ENABLED(TEMP_SENSOR_##n##_IS_MAX##M) || (ENABLED(TEMP_SENSOR_REDUNDANT_IS_MAX##M) && TEMP_SENSOR_REDUNDANT_SOURCE == (n)))
+#define TEMP_SENSOR_IS_ANY_MAX_TC(n) (ENABLED(TEMP_SENSOR_##n##_IS_MAX_TC) || (ENABLED(TEMP_SENSOR_REDUNDANT_IS_MAX_TC) && TEMP_SENSOR_REDUNDANT_SOURCE == n))
 
-// LIB_MAX31855 can be added to the build_flags in platformio.ini to use a user-defined library
-#if LIB_USR_MAX31855
+// LIB_MAX6675 can be added to the build_flags in platformio.ini to use a user-defined library
+// If LIB_MAX6675 is not on the build_flags then raw SPI reads will be used.
+#if HAS_MAX6675 && LIB_USR_MAX6675
+  #include <max6675.h>
+  #define HAS_MAX6675_LIBRARY 1
+#endif
+
+// LIB_MAX31855 can be added to the build_flags in platformio.ini to use a user-defined library.
+// If LIB_MAX31855 is not on the build_flags then raw SPI reads will be used.
+#if HAS_MAX31855 && LIB_USR_MAX31855
   #include <Adafruit_MAX31855.h>
-  #if PIN_EXISTS(MAX31855_MISO) && PIN_EXISTS(MAX31855_SCK)
-    #define MAX31855_USES_SW_SPI 1
-  #endif
-  #if TEMP_SENSOR_IS_MAX(0, MAX31855) && PIN_EXISTS(MAX31855_CS)
-    #define HAS_MAX31855_TEMP 1
-    Adafruit_MAX31855 max31855_0 = Adafruit_MAX31855(MAX31855_CS_PIN
-      #if MAX31855_USES_SW_SPI
-        , MAX31855_MISO_PIN, MAX31855_SCK_PIN  // For software SPI also set MISO/SCK
-      #endif
-      #if ENABLED(LARGE_PINMAP)
-        , HIGH
-      #endif
-    );
-  #endif
-  #if TEMP_SENSOR_IS_MAX(1, MAX31855) && PIN_EXISTS(MAX31855_CS2)
-    #define HAS_MAX31855_TEMP 1
-    Adafruit_MAX31855 max31855_1 = Adafruit_MAX31855(MAX31855_CS2_PIN
-      #if MAX31855_USES_SW_SPI
-        , MAX31855_MISO_PIN, MAX31855_SCK_PIN  // For software SPI also set MISO/SCK
-      #endif
-      #if ENABLED(LARGE_PINMAP)
-        , HIGH
-      #endif
-    );
-  #endif
+  #define HAS_MAX31855_LIBRARY 1
+  typedef Adafruit_MAX31855 MAX31855;
 #endif
 
-// LIB_MAX31865 can be added to the build_flags in platformio.ini to use a user-defined library.
-// If LIB_MAX31865 is not on the build_flags then the Adafruit MAX31865 V1.1.0 library is used.
 #if HAS_MAX31865
-  #include <Adafruit_MAX31865.h>
-  #ifndef MAX31865_MOSI_PIN
-    #define MAX31865_MOSI_PIN SD_MOSI_PIN
-  #endif
-  #if PIN_EXISTS(MAX31865_MISO) && PIN_EXISTS(MAX31865_SCK)
-    #define MAX31865_USES_SW_SPI 1
-  #endif
-  #if TEMP_SENSOR_IS_MAX(0, MAX31865) && PIN_EXISTS(MAX31865_CS)
-    #define HAS_MAX31865_TEMP 1
-      Adafruit_MAX31865 max31865_0 = Adafruit_MAX31865(MAX31865_CS_PIN
-        #if MAX31865_USES_SW_SPI && PIN_EXISTS(MAX31865_MOSI)
-          , MAX31865_MOSI_PIN, MAX31865_MISO_PIN, MAX31865_SCK_PIN  // For software SPI also set MOSI/MISO/SCK
-        #endif
-        #if ENABLED(LARGE_PINMAP)
-          , HIGH
-        #endif
-      );
-  #endif
-  #if TEMP_SENSOR_IS_MAX(1, MAX31865) && PIN_EXISTS(MAX31865_CS2)
-    #define HAS_MAX31865_TEMP 1
-    Adafruit_MAX31865 max31865_1 = Adafruit_MAX31865(MAX31865_CS2_PIN
-      #if MAX31865_USES_SW_SPI && PIN_EXISTS(MAX31865_MOSI)
-        , MAX31865_MOSI_PIN, MAX31865_MISO_PIN, MAX31865_SCK_PIN  // For software SPI also set MOSI/MISO/SCK
-      #endif
-      #if ENABLED(LARGE_PINMAP)
-        , HIGH
-      #endif
-    );
+  #if LIB_USR_MAX31865
+    #include <Adafruit_MAX31865.h>
+    typedef Adafruit_MAX31865 MAX31865;
+  #else
+    #include "../libs/MAX31865.h"
   #endif
 #endif
 
-// LIB_MAX6675 can be added to the build_flags in platformio.ini to use a user-defined library
-#if LIB_USR_MAX6675
-  #include <max6675.h>
-  #if PIN_EXISTS(MAX6675_MISO) && PIN_EXISTS(MAX6675_SCK)
-    #define MAX6675_USES_SW_SPI 1
-  #endif
-  #if TEMP_SENSOR_IS_MAX(0, MAX6675) && PIN_EXISTS(MAX6675_CS)
-    #define HAS_MAX6675_TEMP 1
-    MAX6675 max6675_0 = MAX6675(MAX6675_CS_PIN
-      #if MAX6675_USES_SW_SPI
-        , MAX6675_MISO_PIN, MAX6675_SCK_PIN   // For software SPI also set MISO/SCK
-      #endif
-      #if ENABLED(LARGE_PINMAP)
-        , HIGH
-      #endif
-    );
-  #endif
-  #if TEMP_SENSOR_IS_MAX(1, MAX6675) && PIN_EXISTS(MAX6675_CS2)
-    #define HAS_MAX6675_TEMP 1
-    MAX6675 max6675_1 = MAX6675(MAX6675_CS2_PIN
-      #if MAX6675_USES_SW_SPI
-        , MAX6675_MISO_PIN, MAX6675_SCK_PIN   // For software SPI also set MISO/SCK
-      #endif
-      #if ENABLED(LARGE_PINMAP)
-        , HIGH
-      #endif
-    );
-  #endif
+#if HAS_MAX6675_LIBRARY || HAS_MAX31855_LIBRARY || HAS_MAX31865
+  #define HAS_MAXTC_LIBRARIES 1
 #endif
 
-#if !HAS_MAX6675_TEMP && !HAS_MAX31855_TEMP && !HAS_MAX31865_TEMP
-  #define NO_THERMO_TEMPS 1
+// If we have a MAX TC with SCK and MISO pins defined, it's either on a separate/dedicated Hardware
+// SPI bus, or some pins for Software SPI. Alternate Hardware SPI buses are not supported yet, so
+// your SPI options are:
+//
+//  1. Only CS pin(s) defined:                  Hardware SPI on the default bus (usually the SD card SPI).
+//  2. CS, MISO, and SCK pins defined:          Software SPI on a separate bus, as defined by MISO, SCK.
+//  3. CS, MISO, and SCK pins w/ FORCE_HW_SPI:  Hardware SPI on the default bus, ignoring MISO, SCK.
+//
+#if TEMP_SENSOR_IS_ANY_MAX_TC(0) && TEMP_SENSOR_0_HAS_SPI_PINS && DISABLED(TEMP_SENSOR_FORCE_HW_SPI)
+    #define TEMP_SENSOR_0_USES_SW_SPI 1
 #endif
-
-#if (TEMP_SENSOR_0_IS_MAX_TC || TEMP_SENSOR_1_IS_MAX_TC || TEMP_SENSOR_REDUNDANT_IS_MAX_TC) && PINS_EXIST(MAX6675_SCK, MAX6675_DO) && NO_THERMO_TEMPS
-  #define THERMO_SEPARATE_SPI 1
+#if TEMP_SENSOR_IS_ANY_MAX_TC(1) && TEMP_SENSOR_1_HAS_SPI_PINS && DISABLED(TEMP_SENSOR_FORCE_HW_SPI)
+    #define TEMP_SENSOR_1_USES_SW_SPI 1
 #endif
 
-#if THERMO_SEPARATE_SPI
+#if (TEMP_SENSOR_0_USES_SW_SPI || TEMP_SENSOR_1_USES_SW_SPI) && !HAS_MAXTC_LIBRARIES
   #include "../libs/private_spi.h"
+  #define HAS_MAXTC_SW_SPI 1
 #endif
 
 #if ENABLED(PID_EXTRUSION_SCALING)
   #include "../feature/babystep.h"
 #endif
 
-#include "printcounter.h"
-
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
   #include "../feature/filwidth.h"
 #endif
 #define _E_PSTR(h,N) ((HOTENDS) > N && (h) == N) ? PSTR(LCD_STR_E##N) :
 #define HEATER_PSTR(h) _BED_PSTR(h) _CHAMBER_PSTR(h) _COOLER_PSTR(h) _E_PSTR(h,1) _E_PSTR(h,2) _E_PSTR(h,3) _E_PSTR(h,4) _E_PSTR(h,5) PSTR(LCD_STR_E0)
 
-// public:
+//
+// Initialize MAX TC objects/SPI
+//
+#if HAS_MAX_TC
+
+  #if HAS_MAXTC_SW_SPI
+    // Initialize SoftSPI for non-lib Software SPI; Libraries take care of it themselves.
+    template<uint8_t MisoPin, uint8_t MosiPin, uint8_t SckPin>
+      SoftSPI<MisoPin, MosiPin, SckPin> SPIclass<MisoPin, MosiPin, SckPin>::softSPI;
+    SPIclass<TEMP_0_MISO_PIN, TEMP_0_MOSI_PIN, TEMP_0_SCK_PIN> max_tc_spi;
+  #endif
+
+  #define MAXTC_INIT(n, M) \
+      MAX##M max##M##_##n = MAX##M( \
+        TEMP_##n##_CS_PIN \
+        OPTARG(_MAX31865_##n##_SW, TEMP_##n##_MOSI_PIN) \
+        OPTARG(TEMP_SENSOR_##n##_USES_SW_SPI, TEMP_##n##_MISO_PIN, TEMP_##n##_SCK_PIN) \
+        OPTARG(LARGE_PINMAP, HIGH) \
+      )
+
+  #if HAS_MAX6675_LIBRARY
+    #if TEMP_SENSOR_IS_MAX(0, 6675)
+      MAXTC_INIT(0, 6675);
+    #endif
+    #if TEMP_SENSOR_IS_MAX(1, 6675)
+      MAXTC_INIT(1, 6675);
+    #endif
+  #endif
+
+  #if HAS_MAX31855_LIBRARY
+    #if TEMP_SENSOR_IS_MAX(0, 31855)
+      MAXTC_INIT(0, 31855);
+    #endif
+    #if TEMP_SENSOR_IS_MAX(1, 31855)
+      MAXTC_INIT(1, 31855);
+    #endif
+  #endif
+
+  // MAX31865 always uses a library, unlike '55 & 6675
+  #if HAS_MAX31865
+    #define _MAX31865_0_SW TEMP_SENSOR_0_USES_SW_SPI
+    #define _MAX31865_1_SW TEMP_SENSOR_1_USES_SW_SPI
+
+    #if TEMP_SENSOR_IS_MAX(0, 31865)
+      MAXTC_INIT(0, 31865);
+    #endif
+    #if TEMP_SENSOR_IS_MAX(1, 31865)
+      MAXTC_INIT(1, 31865);
+    #endif
+
+    #undef _MAX31865_0_SW
+    #undef _MAX31865_1_SW
+  #endif
+
+  #undef MAXTC_INIT
+
+#endif
+
+/**
+ * public:
+ */
 
 #if ENABLED(NO_FAN_SLOWING_IN_PID_TUNING)
   bool Temperature::adaptive_fan_slowing = true;
   uint8_t Temperature::coolerfan_speed; // = 0
 #endif
 
+// Init fans according to whether they're native PWM or Software PWM
+#ifdef BOARD_OPENDRAIN_MOSFETS
+  #define _INIT_SOFT_FAN(P) OUT_WRITE_OD(P, FAN_INVERTING ? LOW : HIGH)
+#else
+  #define _INIT_SOFT_FAN(P) OUT_WRITE(P, FAN_INVERTING ? LOW : HIGH)
+#endif
+#if ENABLED(FAN_SOFT_PWM)
+  #define _INIT_FAN_PIN(P) _INIT_SOFT_FAN(P)
+#else
+  #define _INIT_FAN_PIN(P) do{ if (PWM_PIN(P)) SET_PWM(P); else _INIT_SOFT_FAN(P); }while(0)
+#endif
+#if ENABLED(FAST_PWM_FAN)
+  #define SET_FAST_PWM_FREQ(P) set_pwm_frequency(P, FAST_PWM_FAN_FREQUENCY)
+#else
+  #define SET_FAST_PWM_FREQ(P) NOOP
+#endif
+#define INIT_FAN_PIN(P) do{ _INIT_FAN_PIN(P); SET_FAST_PWM_FREQ(P); }while(0)
+
+// HAS_FAN does not include CONTROLLER_FAN
 #if HAS_FAN
 
   uint8_t Temperature::fan_speed[FAN_COUNT]; // = { 0 }
   celsius_t Temperature::extrude_min_temp = EXTRUDE_MINTEMP;
 #endif
 
-// private:
+#if HAS_ADC_BUTTONS
+  uint32_t Temperature::current_ADCKey_raw = HAL_ADC_RANGE;
+  uint16_t Temperature::ADCKey_count = 0;
+#endif
+
+#if ENABLED(PID_EXTRUSION_SCALING)
+  int16_t Temperature::lpq_len; // Initialized in settings.cpp
+#endif
+
+/**
+ * private:
+ */
 
 volatile bool Temperature::raw_temps_ready = false;
 
   bool Temperature::paused_for_probing;
 #endif
 
-// public:
-
-#if HAS_ADC_BUTTONS
-  uint32_t Temperature::current_ADCKey_raw = HAL_ADC_RANGE;
-  uint16_t Temperature::ADCKey_count = 0;
-#endif
-
-#if ENABLED(PID_EXTRUSION_SCALING)
-  int16_t Temperature::lpq_len; // Initialized in settings.cpp
-#endif
+/**
+ * public:
+ * Class and Instance Methods
+ */
 
 #if HAS_PID_HEATING
 
 
 #endif // HAS_PID_HEATING
 
-/**
- * Class and Instance Methods
- */
-
 int16_t Temperature::getHeaterPower(const heater_id_t heater_id) {
   switch (heater_id) {
     #if HAS_HEATED_BED
 #define _EFANOVERLAP(A,B) _FANOVERLAP(E##A,B)
 
 #if HAS_AUTO_FAN
+  #if EXTRUDER_AUTO_FAN_SPEED != 255
+    #define INIT_E_AUTO_FAN_PIN(P) do{ if (P == FAN1_PIN || P == FAN2_PIN) { SET_PWM(P); SET_FAST_PWM_FREQ(P); } else SET_OUTPUT(P); }while(0)
+  #else
+    #define INIT_E_AUTO_FAN_PIN(P) SET_OUTPUT(P)
+  #endif
+  #if CHAMBER_AUTO_FAN_SPEED != 255
+    #define INIT_CHAMBER_AUTO_FAN_PIN(P) do{ if (P == FAN1_PIN || P == FAN2_PIN) { SET_PWM(P); SET_FAST_PWM_FREQ(P); } else SET_OUTPUT(P); }while(0)
+  #else
+    #define INIT_CHAMBER_AUTO_FAN_PIN(P) SET_OUTPUT(P)
+  #endif
 
   #define CHAMBER_FAN_INDEX HOTENDS
 
   }
 
   celsius_float_t Temperature::user_thermistor_to_deg_c(const uint8_t t_index, const int16_t raw) {
-    //#if (MOTHERBOARD == BOARD_RAMPS_14_EFB)
-    //  static uint32_t clocks_total = 0;
-    //  static uint32_t calls = 0;
-    //  uint32_t tcnt5 = TCNT5;
-    //#endif
 
     if (!WITHIN(t_index, 0, COUNT(user_thermistor) - 1)) return 25;
 
       value += t.sh_c_coeff * cu(log_resistance);
     value = 1.0f / value;
 
-    //#if (MOTHERBOARD == BOARD_RAMPS_14_EFB)
-    //  int32_t clocks = TCNT5 - tcnt5;
-    //  if (clocks >= 0) {
-    //    clocks_total += clocks;
-    //    calls++;
-    //  }
-    //#endif
-
     // Return degrees C (up to 999, as the LCD only displays 3 digits)
     return _MIN(value + THERMISTOR_ABS_ZERO_C, 999);
   }
         #if TEMP_SENSOR_0_IS_CUSTOM
           return user_thermistor_to_deg_c(CTI_HOTEND_0, raw);
         #elif TEMP_SENSOR_0_IS_MAX_TC
-          return TERN(TEMP_SENSOR_0_IS_MAX31865, max31865_0.temperature(MAX31865_SENSOR_OHMS_0, MAX31865_CALIBRATION_OHMS_0), raw * 0.25);
+          #if TEMP_SENSOR_0_IS_MAX31865
+            return TERN(LIB_INTERNAL_MAX31865,
+              max31865_0.temperature((uint16_t)raw),
+              max31865_0.temperature(MAX31865_SENSOR_OHMS_0, MAX31865_CALIBRATION_OHMS_0)
+            );
+          #else
+            return raw * 0.25;
+          #endif
         #elif TEMP_SENSOR_0_IS_AD595
           return TEMP_AD595(raw);
         #elif TEMP_SENSOR_0_IS_AD8495
         #if TEMP_SENSOR_1_IS_CUSTOM
           return user_thermistor_to_deg_c(CTI_HOTEND_1, raw);
         #elif TEMP_SENSOR_1_IS_MAX_TC
-          return TERN(TEMP_SENSOR_1_IS_MAX31865, max31865_1.temperature(MAX31865_SENSOR_OHMS_1, MAX31865_CALIBRATION_OHMS_1), raw * 0.25);
+          #if TEMP_SENSOR_0_IS_MAX31865
+            return TERN(LIB_INTERNAL_MAX31865,
+              max31865_1.temperature((uint16_t)raw),
+              max31865_1.temperature(MAX31865_SENSOR_OHMS_1, MAX31865_CALIBRATION_OHMS_1)
+            );
+          #else
+            return raw * 0.25;
+          #endif
         #elif TEMP_SENSOR_1_IS_AD595
           return TEMP_AD595(raw);
         #elif TEMP_SENSOR_1_IS_AD8495
     #if TEMP_SENSOR_REDUNDANT_IS_CUSTOM
       return user_thermistor_to_deg_c(CTI_REDUNDANT, raw);
     #elif TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 0
-      return TERN(TEMP_SENSOR_REDUNDANT_IS_MAX31865, max31865_0.temperature(MAX31865_SENSOR_OHMS_0, MAX31865_CALIBRATION_OHMS_0), raw * 0.25);
+      return TERN(TEMP_SENSOR_REDUNDANT_IS_MAX31865, max31865_0.temperature((uint16_t)raw), raw * 0.25);
     #elif TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 1
-      return TERN(TEMP_SENSOR_REDUNDANT_IS_MAX31865, max31865_1.temperature(MAX31865_SENSOR_OHMS_1, MAX31865_CALIBRATION_OHMS_1), raw * 0.25);
+      return TERN(TEMP_SENSOR_REDUNDANT_IS_MAX31865, max31865_1.temperature((uint16_t)raw), raw * 0.25);
     #elif TEMP_SENSOR_REDUNDANT_IS_THERMISTOR
       SCAN_THERMISTOR_TABLE(TEMPTABLE_REDUNDANT, TEMPTABLE_REDUNDANT_LEN);
     #elif TEMP_SENSOR_REDUNDANT_IS_AD595
   TERN_(TEMP_SENSOR_0_IS_MAX_TC, temp_hotend[0].raw = READ_MAX_TC(0));
   TERN_(TEMP_SENSOR_1_IS_MAX_TC, temp_hotend[1].raw = READ_MAX_TC(1));
   TERN_(TEMP_SENSOR_REDUNDANT_IS_MAX_TC, temp_redundant.raw = READ_MAX_TC(TEMP_SENSOR_REDUNDANT_SOURCE));
+
   #if HAS_HOTEND
     HOTEND_LOOP() temp_hotend[e].celsius = analog_to_celsius_hotend(temp_hotend[e].raw, e);
   #endif
     if (cutter.unitPower > 0 && COOLERCMP(temp_cooler.raw, maxtemp_raw_COOLER)) max_temp_error(H_COOLER);
     if (COOLERCMP(mintemp_raw_COOLER, temp_cooler.raw)) min_temp_error(H_COOLER);
   #endif
-}
-
-#if THERMO_SEPARATE_SPI
-  template<uint8_t MisoPin, uint8_t MosiPin, uint8_t SckPin> SoftSPI<MisoPin, MosiPin, SckPin> SPIclass<MisoPin, MosiPin, SckPin>::softSPI;
-  SPIclass<MAX6675_DO_PIN, SD_MOSI_PIN, MAX6675_SCK_PIN> max_tc_spi;
-#endif
-
-// Init fans according to whether they're native PWM or Software PWM
-#ifdef BOARD_OPENDRAIN_MOSFETS
-  #define _INIT_SOFT_FAN(P) OUT_WRITE_OD(P, FAN_INVERTING ? LOW : HIGH)
-#else
-  #define _INIT_SOFT_FAN(P) OUT_WRITE(P, FAN_INVERTING ? LOW : HIGH)
-#endif
-#if ENABLED(FAN_SOFT_PWM)
-  #define _INIT_FAN_PIN(P) _INIT_SOFT_FAN(P)
-#else
-  #define _INIT_FAN_PIN(P) do{ if (PWM_PIN(P)) SET_PWM(P); else _INIT_SOFT_FAN(P); }while(0)
-#endif
-#if ENABLED(FAST_PWM_FAN)
-  #define SET_FAST_PWM_FREQ(P) set_pwm_frequency(P, FAST_PWM_FAN_FREQUENCY)
-#else
-  #define SET_FAST_PWM_FREQ(P) NOOP
-#endif
-#define INIT_FAN_PIN(P) do{ _INIT_FAN_PIN(P); SET_FAST_PWM_FREQ(P); }while(0)
-#if EXTRUDER_AUTO_FAN_SPEED != 255
-  #define INIT_E_AUTO_FAN_PIN(P) do{ if (P == FAN1_PIN || P == FAN2_PIN) { SET_PWM(P); SET_FAST_PWM_FREQ(P); } else SET_OUTPUT(P); }while(0)
-#else
-  #define INIT_E_AUTO_FAN_PIN(P) SET_OUTPUT(P)
-#endif
-#if CHAMBER_AUTO_FAN_SPEED != 255
-  #define INIT_CHAMBER_AUTO_FAN_PIN(P) do{ if (P == FAN1_PIN || P == FAN2_PIN) { SET_PWM(P); SET_FAST_PWM_FREQ(P); } else SET_OUTPUT(P); }while(0)
-#else
-  #define INIT_CHAMBER_AUTO_FAN_PIN(P) SET_OUTPUT(P)
-#endif
+} // Temperature::updateTemperaturesFromRawValues
 
 /**
  * Initialize the temperature manager
   #endif
 
   // Init (and disable) SPI thermocouples
-  #if TEMP_SENSOR_IS_MAX(0, MAX6675) && PIN_EXISTS(MAX6675_CS)
-    OUT_WRITE(MAX6675_CS_PIN, HIGH);
-  #endif
-  #if TEMP_SENSOR_IS_MAX(1, MAX6675) && PIN_EXISTS(MAX6675_CS2)
-    OUT_WRITE(MAX6675_CS2_PIN, HIGH);
-  #endif
-  #if TEMP_SENSOR_IS_MAX(0, MAX6675) && PIN_EXISTS(MAX31855_CS)
-    OUT_WRITE(MAX31855_CS_PIN, HIGH);
-  #endif
-  #if TEMP_SENSOR_IS_MAX(1, MAX6675) && PIN_EXISTS(MAX31855_CS2)
-    OUT_WRITE(MAX31855_CS2_PIN, HIGH);
-  #endif
-  #if TEMP_SENSOR_IS_MAX(0, MAX6675) && PIN_EXISTS(MAX31865_CS)
-    OUT_WRITE(MAX31865_CS_PIN, HIGH);
-  #endif
-  #if TEMP_SENSOR_IS_MAX(1, MAX6675) && PIN_EXISTS(MAX31865_CS2)
-    OUT_WRITE(MAX31865_CS2_PIN, HIGH);
-  #endif
-
-  #if HAS_MAX31865_TEMP
-    #if TEMP_SENSOR_IS_MAX(0, MAX31865)
-      max31865_0.begin(MAX31865_2WIRE); // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
-    #endif
-    #if TEMP_SENSOR_IS_MAX(1, MAX31865)
-      max31865_1.begin(MAX31865_2WIRE);
-    #endif
-  #endif
-
-  #if HAS_MAX31855_TEMP
-    #if TEMP_SENSOR_IS_MAX(0, MAX31855)
-      max31855_0.begin(MAX31855);
-    #endif
-    #if TEMP_SENSOR_IS_MAX(1, MAX31855)
-      max31855_1.begin(MAX31855);
+  #if TEMP_SENSOR_IS_ANY_MAX_TC(0) && PIN_EXISTS(TEMP_0_CS)
+    OUT_WRITE(TEMP_0_CS_PIN, HIGH);
+  #endif
+  #if TEMP_SENSOR_IS_ANY_MAX_TC(1) && PIN_EXISTS(TEMP_1_CS)
+    OUT_WRITE(TEMP_1_CS_PIN, HIGH);
+  #endif
+
+  // Setup objects for library-based polling of MAX TCs
+  #if HAS_MAXTC_LIBRARIES
+    #define _MAX31865_WIRES(n) MAX31865_##n##WIRE
+    #define MAX31865_WIRES(n) _MAX31865_WIRES(n)
+
+    #if TEMP_SENSOR_IS_MAX(0, 6675) && HAS_MAX6675_LIBRARY
+      max6675_0.begin();
+    #elif TEMP_SENSOR_IS_MAX(0, 31855) && HAS_MAX31855_LIBRARY
+      max31855_0.begin();
+    #elif TEMP_SENSOR_IS_MAX(0, 31865)
+      max31865_0.begin(
+        MAX31865_WIRES(MAX31865_SENSOR_WIRES_0) // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
+        OPTARG(LIB_INTERNAL_MAX31865, MAX31865_SENSOR_OHMS_0, MAX31865_CALIBRATION_OHMS_0)
+      );
+      #if defined(LIB_INTERNAL_MAX31865) && ENABLED(MAX31865_50HZ_FILTER)
+        max31865_0.enable50HzFilter(1);
+      #endif
     #endif
-  #endif
 
-  #if HAS_MAX6675_TEMP
-    #if TEMP_SENSOR_IS_MAX(0, MAX6675)
-      max6675_0.begin(MAX6675);
-    #endif
-    #if TEMP_SENSOR_IS_MAX(1, MAX6675)
-      max6675_1.begin(MAX6675);
+    #if TEMP_SENSOR_IS_MAX(1, 6675) && HAS_MAX6675_LIBRARY
+      max6675_1.begin();
+    #elif TEMP_SENSOR_IS_MAX(1, 31855) && HAS_MAX31855_LIBRARY
+      max31855_1.begin();
+    #elif TEMP_SENSOR_IS_MAX(1, 31865)
+      max31865_1.begin(
+        MAX31865_WIRES(MAX31865_SENSOR_WIRES_1) // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
+        OPTARG(LIB_INTERNAL_MAX31865, MAX31865_SENSOR_OHMS_1, MAX31865_CALIBRATION_OHMS_1)
+      );
+      #if defined(LIB_INTERNAL_MAX31865) && ENABLED(MAX31865_50HZ_FILTER)
+        max31865_1.enable50HzFilter(1);
+      #endif
     #endif
+    #undef MAX31865_WIRES
+    #undef _MAX31865_WIRES
   #endif
 
   #if MB(RUMBA)
       OUT_WRITE(HEATER_0_PIN, HEATER_0_INVERTING);
     #endif
   #endif
-
   #if HAS_HEATER_1
     OUT_WRITE(HEATER_1_PIN, HEATER_1_INVERTING);
   #endif
     INIT_FAN_PIN(CONTROLLER_FAN_PIN);
   #endif
 
-  TERN_(THERMO_SEPARATE_SPI, max_tc_spi.init());
+  #if HAS_MAXTC_SW_SPI
+    max_tc_spi.init();
+  #endif
 
   HAL_adc_init();
 
     INIT_CHAMBER_AUTO_FAN_PIN(CHAMBER_AUTO_FAN_PIN);
   #endif
 
-  // Wait for temperature measurement to settle
-  //delay(250);
-
   #if HAS_HOTEND
-
     #define _TEMP_MIN_E(NR) do{ \
       const celsius_t tmin = _MAX(HEATER_##NR##_MINTEMP, TERN(TEMP_SENSOR_##NR##_IS_CUSTOM, 0, (int)pgm_read_word(&TEMPTABLE_##NR [TEMP_SENSOR_##NR##_MINTEMP_IND].celsius))); \
       temp_range[NR].mintemp = tmin; \
     #if _MINMAX_TEST(7, MAX)
       _TEMP_MAX_E(7);
     #endif
-
   #endif // HAS_HOTEND
 
   #if HAS_HEATED_BED
 
 void Temperature::disable_all_heaters() {
 
+  // Disable autotemp, unpause and reset everything
   TERN_(AUTOTEMP, planner.autotemp_enabled = false);
-
-  // Unpause and reset everything
   TERN_(PROBING_HEATERS_OFF, pause_heaters(false));
 
   #if HAS_HOTEND
 
 #if ENABLED(PRINTJOB_TIMER_AUTOSTART)
 
-  #include "printcounter.h"
-
   bool Temperature::auto_job_over_threshold() {
     #if HAS_HOTEND
       HOTEND_LOOP() if (degTargetHotend(e) > (EXTRUDE_MINTEMP) / 2) return true;
     }
   }
 
-#endif
+#endif // PRINTJOB_TIMER_AUTOSTART
 
 #if ENABLED(PROBING_HEATERS_OFF)
 
     #endif
   }
 
-#endif
+#endif // SINGLENOZZLE_STANDBY_TEMP || SINGLENOZZLE_STANDBY_FAN
 
 #if HAS_MAX_TC
 
     #define THERMOCOUPLE_MAX_ERRORS 15
   #endif
 
-  int Temperature::read_max_tc(TERN_(HAS_MULTI_MAX_TC, const uint8_t hindex/*=0*/)) {
-    #define MAX6675_HEAT_INTERVAL 250UL
+  /**
+   * @brief Read MAX Thermocouple temperature.
+   *
+   * Reads the thermocouple board via HW or SW SPI, using a library (LIB_USR_x) or raw SPI reads.
+   * Doesn't strictly return a temperature; returns an "ADC Value" (i.e. raw register content).
+   *
+   * @param  hindex  the hotend we're referencing (if MULTI_MAX_TC)
+   * @return         integer representing the board's buffer, to be converted later if needed
+   */
+  int16_t Temperature::read_max_tc(TERN_(HAS_MULTI_MAX_TC, const uint8_t hindex/*=0*/)) {
+    #define MAXTC_HEAT_INTERVAL 250UL
 
-    #if HAS_MAX31855_TEMP
-      static uint32_t max_tc_temp = 2000;
-      #define MAX_TC_ERROR_MASK    7
-      #define MAX_TC_DISCARD_BITS 18
-      #define MAX_TC_SPEED_BITS    3        // (_BV(SPR1)) // clock ÷ 64
-    #elif HAS_MAX31865_TEMP
-      static uint16_t max_tc_temp = 2000;   // From datasheet 16 bits D15-D0
-      #define MAX_TC_ERROR_MASK    1        // D0 Bit not used
+    #if HAS_MAX31855
+      #define MAX_TC_ERROR_MASK    7        // D2-0: SCV, SCG, OC
+      #define MAX_TC_DISCARD_BITS 18        // Data D31-18; sign bit D31
+      #define MAX_TC_SPEED_BITS    3        // ~1MHz
+    #elif HAS_MAX31865
+      #define MAX_TC_ERROR_MASK    1        // D0 Bit on fault only
       #define MAX_TC_DISCARD_BITS  1        // Data is in D15-D1
-      #define MAX_TC_SPEED_BITS    3        //  (_BV(SPR1)) // clock ÷ 64
-    #else
-      static uint16_t max_tc_temp = 2000;
-      #define MAX_TC_ERROR_MASK    4
-      #define MAX_TC_DISCARD_BITS  3
-      #define MAX_TC_SPEED_BITS    2        // (_BV(SPR0)) // clock ÷ 16
+      #define MAX_TC_SPEED_BITS    3        // ~1MHz
+    #else // MAX6675
+      #define MAX_TC_ERROR_MASK    3        // D2 only; 1 = open circuit
+      #define MAX_TC_DISCARD_BITS  3        // Data D15-D1
+      #define MAX_TC_SPEED_BITS    2        // ~2MHz
     #endif
 
     #if HAS_MULTI_MAX_TC
       // Needed to return the correct temp when this is called between readings
-      static celsius_t max_tc_temp_previous[MAX_TC_COUNT] = { 0 };
+      static int16_t max_tc_temp_previous[MAX_TC_COUNT] = { 0 };
       #define THERMO_TEMP(I) max_tc_temp_previous[I]
       #define THERMO_SEL(A,B) (hindex ? (B) : (A))
-      #define MAX6675_WRITE(V)     do{ switch (hindex) { case 1:      WRITE(MAX6675_SS2_PIN, V); break; default:      WRITE(MAX6675_SS_PIN, V); } }while(0)
-      #define MAX6675_SET_OUTPUT() do{ switch (hindex) { case 1: SET_OUTPUT(MAX6675_SS2_PIN);    break; default: SET_OUTPUT(MAX6675_SS_PIN);    } }while(0)
+      #define MAXTC_CS_WRITE(V) do{ switch (hindex) { case 1: WRITE(TEMP_1_CS_PIN, V); break; default: WRITE(TEMP_0_CS_PIN, V); } }while(0)
     #else
+      // When we have only 1 max tc, THERMO_SEL will pick the appropriate sensor
+      // variable, and MAXTC_*() macros will be hardcoded to the correct CS pin.
       constexpr uint8_t hindex = 0;
       #define THERMO_TEMP(I) max_tc_temp
-      #if TEMP_SENSOR_IS_ANY_MAX_TC(1)
-        #define THERMO_SEL(A,B) B
-      #else
+      #if TEMP_SENSOR_IS_ANY_MAX_TC(0)
         #define THERMO_SEL(A,B) A
-      #endif
-      #if TEMP_SENSOR_IS_MAX(0, MAX6675)
-        #define MAX6675_WRITE(V)          WRITE(MAX6675_SS_PIN, V)
-        #define MAX6675_SET_OUTPUT() SET_OUTPUT(MAX6675_SS_PIN)
+        #define MAXTC_CS_WRITE(V)  WRITE(TEMP_0_CS_PIN, V)
       #else
-        #define MAX6675_WRITE(V)          WRITE(MAX6675_SS2_PIN, V)
-        #define MAX6675_SET_OUTPUT() SET_OUTPUT(MAX6675_SS2_PIN)
+        #define THERMO_SEL(A,B) B
+        #define MAXTC_CS_WRITE(V)  WRITE(TEMP_1_CS_PIN, V)
       #endif
-
     #endif
 
+    static TERN(HAS_MAX31855, uint32_t, uint16_t) max_tc_temp = THERMO_SEL(
+      TEMP_SENSOR_0_MAX_TC_TMAX,
+      TEMP_SENSOR_1_MAX_TC_TMAX
+    );
+
     static uint8_t max_tc_errors[MAX_TC_COUNT] = { 0 };
+    static millis_t next_max_tc_ms[MAX_TC_COUNT] = { 0 };
 
     // Return last-read value between readings
-    static millis_t next_max_tc_ms[MAX_TC_COUNT] = { 0 };
     millis_t ms = millis();
-    if (PENDING(ms, next_max_tc_ms[hindex])) return int(THERMO_TEMP(hindex));
-    next_max_tc_ms[hindex] = ms + MAX6675_HEAT_INTERVAL;
+    if (PENDING(ms, next_max_tc_ms[hindex]))
+      return (int16_t)THERMO_TEMP(hindex);
 
-    //
-    // TODO: spiBegin, spiRec and spiInit doesn't work when soft spi is used.
-    //
-    #if !THERMO_SEPARATE_SPI && NO_THERMO_TEMPS
-      spiBegin();
-      spiInit(MAX_TC_SPEED_BITS);
-    #endif
+    next_max_tc_ms[hindex] = ms + MAXTC_HEAT_INTERVAL;
 
-    #if NO_THERMO_TEMPS
-      MAX6675_WRITE(LOW);  // enable TT_MAX6675
-      DELAY_NS(100);       // Ensure 100ns delay
-    #endif
+    #if !HAS_MAXTC_LIBRARIES
+      max_tc_temp = 0;
 
-    max_tc_temp = 0;
+      #if !HAS_MAXTC_SW_SPI
+        // Initialize SPI using the default Hardware SPI bus.
+        // FIXME: spiBegin, spiRec and spiInit doesn't work when soft spi is used.
+        spiBegin();
+        spiInit(MAX_TC_SPEED_BITS);
+      #endif
+
+      MAXTC_CS_WRITE(LOW);  // enable MAXTC
+      DELAY_NS(100);        // Ensure 100ns delay
 
-    // Read a big-endian temperature value
-    #if NO_THERMO_TEMPS
+      // Read a big-endian temperature value without using a library
       for (uint8_t i = sizeof(max_tc_temp); i--;) {
-        max_tc_temp |= TERN(THERMO_SEPARATE_SPI, max_tc_spi.receive(), spiRec());
+        max_tc_temp |= TERN(HAS_MAXTC_SW_SPI, max_tc_spi.receive(), spiRec());
         if (i > 0) max_tc_temp <<= 8; // shift left if not the last byte
       }
-        MAX6675_WRITE(HIGH); // disable TT_MAX6675
-    #endif
 
-    #if HAS_MAX31855_TEMP
-      Adafruit_MAX31855 &max855ref = THERMO_SEL(max31855_0, max31855_1);
-      max_tc_temp = max855ref.readRaw32();
-    #endif
-
-    #if HAS_MAX31865_TEMP
-      Adafruit_MAX31865 &max865ref = THERMO_SEL(max31865_0, max31865_1);
-      #if ENABLED(LIB_USR_MAX31865)
-        max_tc_temp = max865ref.readRTD_with_Fault();
+      MAXTC_CS_WRITE(HIGH);  // disable MAXTC
+    #else
+      #if HAS_MAX6675_LIBRARY
+        MAX6675 &max6675ref = THERMO_SEL(max6675_0, max6675_1);
+        max_tc_temp = max6675ref.readRaw16();
       #endif
-    #endif
 
-    #if HAS_MAX6675_TEMP
-      MAX6675 &max6675ref = THERMO_SEL(max6675_0, max6675_1);
-      max_tc_temp = max6675ref.readRaw16();
-    #endif
+      #if HAS_MAX31855_LIBRARY
+        MAX31855 &max855ref = THERMO_SEL(max31855_0, max31855_1);
+        max_tc_temp = max855ref.readRaw32();
+      #endif
 
-    #if ENABLED(LIB_ADAFRUIT_MAX31865)
-      const uint8_t fault_31865 = max865ref.readFault() & 0x3FU;
+      #if HAS_MAX31865
+        MAX31865 &max865ref = THERMO_SEL(max31865_0, max31865_1);
+        max_tc_temp = TERN(LIB_INTERNAL_MAX31865, max865ref.readRaw(), max865ref.readRTD_with_Fault());
+      #endif
     #endif
 
-    if (DISABLED(IGNORE_THERMOCOUPLE_ERRORS)
-      && TERN(LIB_ADAFRUIT_MAX31865, fault_31865, (max_tc_temp & MAX_TC_ERROR_MASK))
-    ) {
+    // Handle an error. If there have been more than THERMOCOUPLE_MAX_ERRORS, send an error over serial.
+    // Either way, return the TMAX for the thermocouple to trigger a max_temp_error()
+    if (max_tc_temp & MAX_TC_ERROR_MASK) {
       max_tc_errors[hindex]++;
+
       if (max_tc_errors[hindex] > THERMOCOUPLE_MAX_ERRORS) {
         SERIAL_ERROR_START();
         SERIAL_ECHOPGM("Temp measurement error! ");
-        #if MAX_TC_ERROR_MASK == 7
-          SERIAL_ECHOPGM("MAX31855 Fault : (", max_tc_temp & 0x7, ") >> ");
+        #if HAS_MAX31855
+          SERIAL_ECHOPAIR("MAX31855 Fault: (", max_tc_temp & 0x7, ") >> ");
           if (max_tc_temp & 0x1)
             SERIAL_ECHOLNPGM("Open Circuit");
           else if (max_tc_temp & 0x2)
           else if (max_tc_temp & 0x4)
             SERIAL_ECHOLNPGM("Short to VCC");
         #elif HAS_MAX31865
-          #if ENABLED(LIB_USR_MAX31865)
-            // At the present time we do not have the ability to set the MAX31865 HIGH threshold
-            // or thr LOW threshold, so no need to check for them, zero these bits out
-            const uint8_t fault_31865 = max865ref.readFault() & 0x3FU;
-          #endif
+          const uint8_t fault_31865 = max865ref.readFault();
           max865ref.clearFault();
           if (fault_31865) {
             SERIAL_EOL();
-            SERIAL_ECHOLNPAIR("\nMAX31865 Fault :(", fault_31865, ")  >>");
+            SERIAL_ECHOLNPAIR("\nMAX31865 Fault: (", fault_31865, ")  >>");
             if (fault_31865 & MAX31865_FAULT_HIGHTHRESH)
               SERIAL_ECHOLNPGM("RTD High Threshold");
             if (fault_31865 & MAX31865_FAULT_LOWTHRESH)
               SERIAL_ECHOLNPGM("RTD Low Threshold");
             if (fault_31865 & MAX31865_FAULT_REFINLOW)
-              SERIAL_ECHOLNPGM("REFIN- > 0.85 x Bias");
+              SERIAL_ECHOLNPGM("REFIN- > 0.85 x V bias");
             if (fault_31865 & MAX31865_FAULT_REFINHIGH)
-              SERIAL_ECHOLNPGM("REFIN- < 0.85 x Bias - FORCE- open");
+              SERIAL_ECHOLNPGM("REFIN- < 0.85 x V bias (FORCE- open)");
             if (fault_31865 & MAX31865_FAULT_RTDINLOW)
-              SERIAL_ECHOLNPGM("REFIN- < 0.85 x Bias - FORCE- open");
+              SERIAL_ECHOLNPGM("REFIN- < 0.85 x V bias (FORCE- open)");
             if (fault_31865 & MAX31865_FAULT_OVUV)
               SERIAL_ECHOLNPGM("Under/Over voltage");
           }
-        #else
-          SERIAL_ECHOLNPGM("MAX6675 Open Circuit");
+        #else // MAX6675
+          SERIAL_ECHOLNPGM("MAX6675 Fault: Open Circuit");
         #endif
 
-        // Thermocouple open
-        max_tc_temp = 4 * THERMO_SEL(TEMP_SENSOR_0_MAX_TC_TMAX, TEMP_SENSOR_1_MAX_TC_TMAX);
+        // Set thermocouple above max temperature (TMAX)
+        max_tc_temp = THERMO_SEL(TEMP_SENSOR_0_MAX_TC_TMAX, TEMP_SENSOR_1_MAX_TC_TMAX) << (MAX_TC_DISCARD_BITS + 1);
       }
-      else
-        max_tc_temp >>= MAX_TC_DISCARD_BITS;
     }
     else {
-      max_tc_temp >>= MAX_TC_DISCARD_BITS;
-      max_tc_errors[hindex] = 0;
+      max_tc_errors[hindex] = 0; // No error bit, reset error count
     }
 
-    #if HAS_MAX31855
-      if (max_tc_temp & 0x00002000) max_tc_temp |= 0xFFFFC000; // Support negative temperature
-    #endif
+    max_tc_temp >>= MAX_TC_DISCARD_BITS;
 
-    // Return the RTD resistance for MAX31865 for display in SHOW_TEMP_ADC_VALUES
-    #if HAS_MAX31865_TEMP
-      #if ENABLED(LIB_ADAFRUIT_MAX31865)
-        max_tc_temp = (uint32_t(max865ref.readRTD()) * THERMO_SEL(MAX31865_CALIBRATION_OHMS_0, MAX31865_CALIBRATION_OHMS_1)) >> 16;
-      #elif ENABLED(LIB_USR_MAX31865)
-        max_tc_temp = (uint32_t(max_tc_temp) * THERMO_SEL(MAX31865_CALIBRATION_OHMS_0, MAX31865_CALIBRATION_OHMS_1)) >> 16;
-      #endif
+    #if HAS_MAX31855
+      // Support negative temperature for MAX38155
+      if (max_tc_temp & 0x00002000) max_tc_temp |= 0xFFFFC000;
     #endif
 
     THERMO_TEMP(hindex) = max_tc_temp;
 
-    return int(max_tc_temp);
+    return (int16_t)max_tc_temp;
   }
 
 #endif // HAS_MAX_TC
     temp_redundant.update();
   #endif
 
-  TERN_(HAS_TEMP_ADC_2, temp_hotend[2].update());
-  TERN_(HAS_TEMP_ADC_3, temp_hotend[3].update());
-  TERN_(HAS_TEMP_ADC_4, temp_hotend[4].update());
-  TERN_(HAS_TEMP_ADC_5, temp_hotend[5].update());
-  TERN_(HAS_TEMP_ADC_6, temp_hotend[6].update());
-  TERN_(HAS_TEMP_ADC_7, temp_hotend[7].update());
-  TERN_(HAS_TEMP_ADC_BED, temp_bed.update());
+  TERN_(HAS_TEMP_ADC_2,       temp_hotend[2].update());
+  TERN_(HAS_TEMP_ADC_3,       temp_hotend[3].update());
+  TERN_(HAS_TEMP_ADC_4,       temp_hotend[4].update());
+  TERN_(HAS_TEMP_ADC_5,       temp_hotend[5].update());
+  TERN_(HAS_TEMP_ADC_6,       temp_hotend[6].update());
+  TERN_(HAS_TEMP_ADC_7,       temp_hotend[7].update());
+  TERN_(HAS_TEMP_ADC_BED,     temp_bed.update());
   TERN_(HAS_TEMP_ADC_CHAMBER, temp_chamber.update());
-  TERN_(HAS_TEMP_ADC_PROBE, temp_probe.update());
-  TERN_(HAS_TEMP_ADC_COOLER, temp_cooler.update());
+  TERN_(HAS_TEMP_ADC_PROBE,   temp_probe.update());
+  TERN_(HAS_TEMP_ADC_COOLER,  temp_cooler.update());
 
   TERN_(HAS_JOY_ADC_X, joystick.x.update());
   TERN_(HAS_JOY_ADC_Y, joystick.y.update());
     SERIAL_PRINT(t, SFP);
     #if ENABLED(SHOW_TEMP_ADC_VALUES)
       // Temperature MAX SPI boards do not have an OVERSAMPLENR defined
-      SERIAL_ECHOPAIR(" (", TERN(NO_THERMO_TEMPS, false, k == 'T') ? r : r * RECIPROCAL(OVERSAMPLENR));
+      SERIAL_ECHOPAIR(" (", TERN(HAS_MAXTC_LIBRARIES, k == 'T', false) ? r : r * RECIPROCAL(OVERSAMPLENR));
       SERIAL_CHAR(')');
     #endif
     delay(2);

Marlin/src/module/temperature.h

 
       static heater_idle_t heater_idle[NR_HEATER_IDLE];
 
+    #endif // HEATER_IDLE_TIMER
+
+    #if HAS_ADC_BUTTONS
+      static uint32_t current_ADCKey_raw;
+      static uint16_t ADCKey_count;
+    #endif
+
+    #if ENABLED(PID_EXTRUSION_SCALING)
+      static int16_t lpq_len;
     #endif
 
   private:
     #endif
 
   public:
-    #if HAS_ADC_BUTTONS
-      static uint32_t current_ADCKey_raw;
-      static uint16_t ADCKey_count;
-    #endif
-
-    #if ENABLED(PID_EXTRUSION_SCALING)
-      static int16_t lpq_len;
-    #endif
-
     /**
      * Instance Methods
      */
       #else
         #define READ_MAX_TC(N) read_max_tc()
       #endif
-      static int read_max_tc(TERN_(HAS_MULTI_MAX_TC, const uint8_t hindex=0));
+      static int16_t read_max_tc(TERN_(HAS_MULTI_MAX_TC, const uint8_t hindex=0));
     #endif
 
     static void checkExtruderAutoFans();

Marlin/src/pins/linux/pins_RAMPS_LINUX.h

 #define TEMP_1_PIN                             1  // Analog Input
 #define TEMP_BED_PIN                           2  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      66  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       66  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      66  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       66  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/lpc1768/pins_BTT_SKR_common.h

   #endif
 #endif
 
+// CS, MISO, MOSI, and SCK for MAX Thermocouple SPI
+#if HAS_MAX_TC
+  //#define TEMP_0_CS_PIN   P...
+  //#define TEMP_0_MISO_PIN P...
+  //#define TEMP_0_MOSI_PIN P...
+  //#define TEMP_0_SCK_PIN  P...
+
+  //#define TEMP_1_CS_PIN   P...
+  //#define TEMP_1_MISO_PIN P...
+  //#define TEMP_1_MOSI_PIN P...
+  //#define TEMP_1_SCK_PIN  P...
+#endif
+
 //
 // Heaters / Fans
 //

Marlin/src/pins/lpc1768/pins_RAMPS_RE_ARM.h

 
 #define PS_ON_PIN                          P2_12  // (12)
 
-#if !defined(MAX6675_SS_PIN) && DISABLED(USE_ZMAX_PLUG)
-  #define MAX6675_SS_PIN                   P1_28
+#if !defined(TEMP_0_CS_PIN) && DISABLED(USE_ZMAX_PLUG)
+  #define TEMP_0_CS_PIN                    P1_28
 #endif
 
 #if ENABLED(CASE_LIGHT_ENABLE) && !PIN_EXISTS(CASE_LIGHT) && !defined(SPINDLE_LASER_ENA_PIN)

Marlin/src/pins/mega/pins_MALYAN_M180.h

 #define TEMP_BED_PIN                          15  // Analog Input
 
 // Extruder thermocouples 0 and 1 are read out by two separate ICs using
-// SPI for Max6675 Thermocouple
+// SPI for MAX Thermocouple
 // Uses a separate SPI bus
-#define THERMO_SCK_PIN                        78  // E2 - SCK
-#define THERMO_DO_PIN                          3  // E5 - DO
-#define THERMO_CS1_PIN                         5  // E3 - CS0
-#define THERMO_CS2_PIN                         2  // E4 - CS1
+#define TEMP_0_CS_PIN                          5  // E3 - CS0
+#define TEMP_0_SCK_PIN                        78  // E2 - SCK
+#define TEMP_0_MISO_PIN                        3  // E5 - MISO
+//#define TEMP_0_MOSI_PIN                    ...  // For MAX31865
 
-#define MAX6675_SS_PIN            THERMO_CS1_PIN
-#define MAX6675_SS2_PIN           THERMO_CS2_PIN
-#define MAX6675_SCK_PIN           THERMO_SCK_PIN
-#define MAX6675_DO_PIN             THERMO_DO_PIN
+#define TEMP_1_CS_PIN                          2  // E4 - CS1
+#define TEMP_1_SCK_PIN            TEMP_0_SCK_PIN
+#define TEMP_1_MISO_PIN          TEMP_0_MISO_PIN
+//#define TEMP_1_MOSI_PIN        TEMP_0_MOSI_PIN
 
 //
 // Heaters / Fans

Marlin/src/pins/mega/pins_MIGHTYBOARD_REVE.h

 // K7 - 69 / ADC15 - 15
 #define TEMP_BED_PIN                          15
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 // Uses a separate SPI bus
 //
 //  3 E5 DO (SO)
 //  2 E4 CS2
 // 78 E2 SCK
 //
-#define THERMO_SCK_PIN                        78  // E2
-#define THERMO_DO_PIN                          3  // E5
-#define THERMO_CS1_PIN                         5  // E3
-#define THERMO_CS2_PIN                         2  // E4
-
-#define MAX6675_SS_PIN            THERMO_CS1_PIN
-#define MAX6675_SS2_PIN           THERMO_CS2_PIN
-#define MAX6675_SCK_PIN           THERMO_SCK_PIN
-#define MAX6675_DO_PIN             THERMO_DO_PIN
+#define TEMP_0_CS_PIN                          5  // E3
+#define TEMP_0_SCK_PIN                        78  // E2
+#define TEMP_0_MISO_PIN                        3  // E5
+//#define TEMP_0_MOSI_PIN                    ...  // For MAX31865
+
+#define TEMP_1_CS_PIN                          2  // E4
+#define TEMP_1_SCK_PIN            TEMP_0_SCK_PIN
+#define TEMP_1_MISO_PIN          TEMP_0_MISO_PIN
+//#define TEMP_1_MOSI_PIN        TEMP_0_MOSI_PIN
 
 //
 // Augmentation for auto-assigning plugs

Marlin/src/pins/mega/pins_PICA.h

 
 #define SSR_PIN                                6
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      66  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       66  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      66  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       66  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/pinsDebug_list.h

 #if PIN_EXISTS(LED_RED)
   REPORT_NAME_DIGITAL(__LINE__, LED_RED_PIN)
 #endif
-#if PIN_EXISTS(MAX6675_DO)
-  REPORT_NAME_DIGITAL(__LINE__, MAX6675_DO_PIN)
+#if PIN_EXISTS(TEMP_0_CS)
+  REPORT_NAME_DIGITAL(__LINE__, TEMP_0_CS_PIN)
 #endif
-#if PIN_EXISTS(MAX6675_SCK)
-  REPORT_NAME_DIGITAL(__LINE__, MAX6675_SCK_PIN)
+#if PIN_EXISTS(TEMP_0_SCK)
+  REPORT_NAME_DIGITAL(__LINE__, TEMP_0_SCK_PIN)
 #endif
-#if PIN_EXISTS(MAX6675_SS)
-  REPORT_NAME_DIGITAL(__LINE__, MAX6675_SS_PIN)
+#if PIN_EXISTS(TEMP_0_MOSI)
+  REPORT_NAME_DIGITAL(__LINE__, TEMP_0_MOSI_PIN)
 #endif
-#if PIN_EXISTS(MAX6675_SS2)
-  REPORT_NAME_DIGITAL(__LINE__, MAX6675_SS2_PIN)
+#if PIN_EXISTS(TEMP_0_MISO)
+  REPORT_NAME_DIGITAL(__LINE__, TEMP_0_MISO_PIN)
+#endif
+#if PIN_EXISTS(TEMP_1_CS)
+  REPORT_NAME_DIGITAL(__LINE__, TEMP_1_CS_PIN)
+#endif
+#if PIN_EXISTS(TEMP_1_SCK)
+  REPORT_NAME_DIGITAL(__LINE__, TEMP_1_SCK_PIN)
+#endif
+#if PIN_EXISTS(TEMP_1_MOSI)
+  REPORT_NAME_DIGITAL(__LINE__, TEMP_1_MOSI_PIN)
+#endif
+#if PIN_EXISTS(TEMP_1_MISO)
+  REPORT_NAME_DIGITAL(__LINE__, TEMP_1_MISO_PIN)
 #endif
 #if PIN_EXISTS(MAX7219_CLK)
   REPORT_NAME_DIGITAL(__LINE__, MAX7219_CLK_PIN)
 #if PIN_EXISTS(SUICIDE)
   REPORT_NAME_DIGITAL(__LINE__, SUICIDE_PIN)
 #endif
-#if PIN_EXISTS(THERMO_CS1)
-  REPORT_NAME_DIGITAL(__LINE__, THERMO_CS1_PIN)
-#endif
-#if PIN_EXISTS(THERMO_CS2)
-  REPORT_NAME_DIGITAL(__LINE__, THERMO_CS2_PIN)
-#endif
-#if PIN_EXISTS(THERMO_DO)
-  REPORT_NAME_DIGITAL(__LINE__, THERMO_DO_PIN)
-#endif
-#if PIN_EXISTS(THERMO_SCK)
-  REPORT_NAME_DIGITAL(__LINE__, THERMO_SCK_PIN)
-#endif
 #if PIN_EXISTS(TLC_BLANK)
   REPORT_NAME_DIGITAL(__LINE__, TLC_BLANK_PIN)
 #endif

Marlin/src/pins/rambo/pins_RAMBO.h

 #define SPINDLE_DIR_PIN                       32
 
 //
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 //
-#ifndef MAX6675_SS_PIN
-  #define MAX6675_SS_PIN                      32  // SPINDLE_DIR_PIN / STAT_LED_BLUE_PIN
+#ifndef TEMP_0_CS_PIN
+  #define TEMP_0_CS_PIN                       32  // SPINDLE_DIR_PIN / STAT_LED_BLUE_PIN
 #endif
 
 //

Marlin/src/pins/ramps/pins_FORMBOT_RAPTOR.h

 #define TEMP_1_PIN                            15  // Analog Input
 #define TEMP_BED_PIN                          14  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      66  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       66  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      66  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       66  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/ramps/pins_FORMBOT_TREX2PLUS.h

 #define TEMP_1_PIN                            15  // Analog Input
 #define TEMP_BED_PIN                           3  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      66  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       66  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      66  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       66  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/ramps/pins_FORMBOT_TREX3.h

 #define TEMP_1_PIN                            15  // Analog Input
 #define TEMP_BED_PIN                          14  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      66  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       66  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      66  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       66  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/ramps/pins_RAMPS.h

 #endif
 
 //
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 //
-#ifndef MAX6675_SS_PIN
-  #define MAX6675_SS_PIN                      66  // Don't use 53 if using Display/SD card (SDSS) or 49 (SD_DETECT_PIN)
+#ifndef TEMP_0_CS_PIN
+  #define TEMP_0_CS_PIN                       66  // Don't use 53 if using Display/SD card (SDSS) or 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/ramps/pins_RAMPS_OLD.h

 #define TEMP_0_PIN                             2  // Analog Input
 #define TEMP_BED_PIN                           1  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      66  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       66  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      66  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       66  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/ramps/pins_RIGIDBOARD.h

 #define TEMP_1_PIN                            13  // Analog Input
 #define TEMP_BED_PIN                          15  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
-#undef MAX6675_SS_PIN
+// SPI for MAX Thermocouple
+#undef TEMP_0_CS_PIN
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      53  // Don't use pin 53 if there is even the remote possibility of using Display/SD card
+  #define TEMP_0_CS_PIN                       53  // Don't use pin 53 if there is even the remote possibility of using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      49  // Don't use pin 49 as this is tied to the switch inside the SD card socket to detect if there is an SD card present
+  #define TEMP_0_CS_PIN                       49  // Don't use pin 49 as this is tied to the switch inside the SD card socket to detect if there is an SD card present
 #endif
 
 //

Marlin/src/pins/ramps/pins_TENLOG_D3_HERO.h

 #define TEMP_1_PIN                            15  // Analog Input
 #define TEMP_BED_PIN                          14  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      -1  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       -1  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      -1  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       -1  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/ramps/pins_TT_OSCAR.h

   #define TEMP_4_PIN                          12
 #endif
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 //#if DISABLED(SDSUPPORT)
-//  #define MAX6675_SS_PIN   66   // Don't use 53 if using Display/SD card
+//  #define TEMP_0_CS_PIN    66   // Don't use 53 if using Display/SD card
 //#else
-//  #define MAX6675_SS_PIN   66   // Don't use 49 (SD_DETECT_PIN)
+//  #define TEMP_0_CS_PIN    66   // Don't use 49 (SD_DETECT_PIN)
 //#endif
 
 //

Marlin/src/pins/sam/pins_DUE3DOM.h

 #define TEMP_2_PIN                             5  // Analog Input (unused)
 #define TEMP_BED_PIN                           1  // Analog Input (BED thermistor)
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      -1
+  #define TEMP_0_CS_PIN                       -1
 #else
-  #define MAX6675_SS_PIN                      -1
+  #define TEMP_0_CS_PIN                       -1
 #endif
 
 //

Marlin/src/pins/sam/pins_DUE3DOM_MINI.h

 #define TEMP_2_PIN                             5  // Analog Input (OnBoard thermistor beta 3950)
 #define TEMP_BED_PIN                           1  // Analog Input (BED thermistor)
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      53
+  #define TEMP_0_CS_PIN                       53
 #else
-  #define MAX6675_SS_PIN                      53
+  #define TEMP_0_CS_PIN                       53
 #endif
 
 //

Marlin/src/pins/sam/pins_RADDS.h

 #define TEMP_4_PIN                             5  // dummy so will compile when PINS_DEBUGGING is enabled
 #define TEMP_BED_PIN                           4  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      53
+  #define TEMP_0_CS_PIN                       53
 #else
-  #define MAX6675_SS_PIN                      49
+  #define TEMP_0_CS_PIN                       49
 #endif
 
 //

Marlin/src/pins/sam/pins_RAMPS_DUO.h

 #undef TEMP_BED_PIN
 #define TEMP_BED_PIN                          10  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
-#undef MAX6675_SS_PIN
+// SPI for MAX Thermocouple
+#undef TEMP_0_CS_PIN
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      69  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       69  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      69  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       69  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/sam/pins_RAMPS_FD_V1.h

 #define TEMP_2_PIN                             3  // Analog Input
 #define TEMP_BED_PIN                           0  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      53
+  #define TEMP_0_CS_PIN                       53
 #else
-  #define MAX6675_SS_PIN                      49
+  #define TEMP_0_CS_PIN                       49
 #endif
 
 //

Marlin/src/pins/sam/pins_RAMPS_SMART.h

 #undef TEMP_BED_PIN
 #define TEMP_BED_PIN                          11  // Analog Input
 
-// SPI for Max6675 or Max31855 Thermocouple
-#undef MAX6675_SS_PIN
+// SPI for MAX Thermocouple
+#undef TEMP_0_CS_PIN
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      67  // Don't use 53 if using Display/SD card
+  #define TEMP_0_CS_PIN                       67  // Don't use 53 if using Display/SD card
 #else
-  #define MAX6675_SS_PIN                      67  // Don't use 49 (SD_DETECT_PIN)
+  #define TEMP_0_CS_PIN                       67  // Don't use 49 (SD_DETECT_PIN)
 #endif
 
 //

Marlin/src/pins/sam/pins_RURAMPS4D_11.h

   #define TEMP_5_PIN                           6  // A6 (Marlin 2.0 not support)
 #endif
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 /*
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      53
+  #define TEMP_0_CS_PIN                       53
 #else
-  #define MAX6675_SS_PIN                      49
+  #define TEMP_0_CS_PIN                       49
 #endif
 */
 

Marlin/src/pins/sam/pins_RURAMPS4D_13.h

   #define TEMP_5_PIN                           6  // A6 (Marlin 2.0 not support)
 #endif
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 /*
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS_PIN                      53
+  #define TEMP_0_CS_PIN                       53
 #else
-  #define MAX6675_SS_PIN                      49
+  #define TEMP_0_CS_PIN                       49
 #endif
 */
 

Marlin/src/pins/sam/pins_ULTRATRONICS_PRO.h

 #define SD_MISO_PIN                           74
 #define SD_MOSI_PIN                           75
 
-// SPI for Max6675 or Max31855 Thermocouple
-#define MAX6675_SS_PIN                        65
-#define MAX31855_SS0                          65
-#define MAX31855_SS1                          52
-#define MAX31855_SS2                          50
-#define MAX31855_SS3                          51
+// SPI for MAX Thermocouple
+#define TEMP_0_CS_PIN                         65
+#define TEMP_1_CS_PIN                         52
+#define TEMP_2_CS_PIN                         50
+#define TEMP_3_CS_PIN                         51
 
 #define ENC424_SS                             61
 

Marlin/src/pins/stm32f1/pins_MINGDA_MPX_ARM_MINI.h

 //#define TEMP_0_PIN                        PB3   // E0 K+
 #define TEMP_BED_PIN                        PF7   // THERM_BED
 
-#define MAX6675_SS_PIN                      PB5
-#define MAX6675_SCK_PIN                     PB3
-#define MAX6675_DO_PIN                      PB4
-#define MAX6675_MOSI_PIN                    PA14
+#define TEMP_0_CS_PIN                       PB5
+#define TEMP_0_SCK_PIN                      PB3
+#define TEMP_0_MISO_PIN                     PB4
+#define TEMP_0_MOSI_PIN                     PA14
 
 //
 // Heaters / Fans

Marlin/src/pins/stm32f1/pins_MKS_ROBIN.h

 //
 // Thermocouples
 //
-//#define MAX6675_SS_PIN                    PE5   // TC1 - CS1
-//#define MAX6675_SS_PIN                    PE6   // TC2 - CS2
+//#define TEMP_0_CS_PIN                     PE5   // TC1 - CS1
+//#define TEMP_0_CS_PIN                     PE6   // TC2 - CS2
 
 //
 // Filament runout sensor

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h

 //
 // Thermocouples
 //
-//#define MAX6675_SS_PIN                    PE5   // TC1 - CS1
-//#define MAX6675_SS_PIN                    PE6   // TC2 - CS2
+//#define TEMP_0_CS_PIN                     PE5   // TC1 - CS1
+//#define TEMP_0_CS_PIN                     PE6   // TC2 - CS2
 
 //
 // Misc. Functions

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_V2.h

 //
 // Thermocouples
 //
-//#define MAX6675_SS_PIN                    PE5   // TC1 - CS1
-//#define MAX6675_SS_PIN                    PE6   // TC2 - CS2
+//#define TEMP_0_CS_PIN                     PE5   // TC1 - CS1
+//#define TEMP_0_CS_PIN                     PE6   // TC2 - CS2
 
 //
 // Misc. Functions

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_PRO.h

 /**
  * Note: MKS Robin Pro board is using SPI2 interface. Make sure your stm32duino library is configured accordingly
  */
-//#define MAX6675_SS_PIN                    PE5   // TC1 - CS1
-//#define MAX6675_SS_PIN                    PF11  // TC2 - CS2
+//#define TEMP_0_CS_PIN                     PE5   // TC1 - CS1
+//#define TEMP_0_CS_PIN                     PF11  // TC2 - CS2
 
 #define POWER_LOSS_PIN                      PA2   // PW_DET
 #define PS_ON_PIN                           PG11  // PW_OFF

Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h

 
 #define TEMP_BED_PIN                        PC0   // T0 <-> Bed
 
-// SPI for Max6675 or Max31855 Thermocouple
+// SPI for MAX Thermocouple
 // Uses a separate SPI bus
-// If you have a two-way thermocouple, you can customize two THERMO_CSx_PIN pins (x:1~2)
+// If you have a two-way thermocouple, you can customize two TEMP_x_CS_PIN pins (x:0~1)
 
-#define THERMO_SCK_PIN                      PI1   // SCK
-#define THERMO_DO_PIN                       PI2   // MISO
-#define THERMO_CS1_PIN                      PH9   // GTR K-TEMP
-#define THERMO_CS2_PIN                      PH2   // M5 K-TEMP
+#define TEMP_0_CS_PIN                       PH9   // GTR K-TEMP
+#define TEMP_0_SCK_PIN                      PI1   // SCK
+#define TEMP_0_MISO_PIN                     PI2   // MISO
+//#define TEMP_0_MOSI_PIN                   ...   // For MAX31865
 
-#define MAX6675_SS_PIN            THERMO_CS1_PIN
-#define MAX6675_SS2_PIN           THERMO_CS2_PIN
-#define MAX6675_SCK_PIN           THERMO_SCK_PIN
-#define MAX6675_DO_PIN             THERMO_DO_PIN
+#define TEMP_1_CS_PIN                       PH2   // M5 K-TEMP
+#define TEMP_1_SCK_PIN           TEMP_0_SCK_PIN
+#define TEMP_1_MISO_PIN         TEMP_0_MISO_PIN
+//#define TEMP_1_MOSI_PIN       TEMP_0_MOSI_PIN
 
 //
 // Heaters / Fans

Marlin/src/pins/stm32f4/pins_LERDGE_S.h

 // MAX6675 Cold-Junction-Compensated K-Thermocouple to Digital Converter (0°C to +1024°C)
 // https://datasheets.maximintegrated.com/en/ds/MAX6675.pdf
 
-#define MAX6675_SCK_PIN                     PB3   // max6675 datasheet: SCK pin, found with multimeter, not tested
-#define MAX6675_DO_PIN                      PB4   // max6675 datasheet: SO pin, found with multimeter, not tested
-#define MAX6675_SS_PIN                      PC4   // max6675 datasheet: /CS pin, found with multimeter, not tested and likely wrong
+#define TEMP_0_CS_PIN                       PC4   // max6675 datasheet: /CS pin, found with multimeter, not tested and likely wrong
+#define TEMP_0_SCK_PIN                      PB3   // max6675 datasheet: SCK pin, found with multimeter, not tested
+#define TEMP_0_MISO_PIN                     PB4   // max6675 datasheet: SO pin, found with multimeter, not tested
 
 // Expansion board with second max6675
 // Warning: Some boards leave the slot unpopulated.
 
-//#define MAX6675_SCK2_PIN                  PB3   // max6675 datasheet: SCK pin, found with multimeter, not tested
-//#define MAX6675_DO2_PIN                   PB4   // max6675 datasheet: SO pin, found with multimeter, not tested
-//#define MAX6675_SS2_PIN                   PF1   // max6675 datasheet: /CS pin, found with multimeter, not tested
+//#define TEMP_1_CS_PIN                     PF1   // max6675 datasheet: /CS pin, found with multimeter, not tested
+//#define TEMP_1_SCK_PIN                    PB3   // max6675 datasheet: SCK pin, found with multimeter, not tested
+//#define TEMP_1_MISO_PIN                   PB4   // max6675 datasheet: SO pin, found with multimeter, not tested
 
 //
 // Heaters / Fans

Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3.h

 //
 // Thermocouples
 //
-//#define MAX6675_SS_PIN            HEATER_0_PIN  // TC1 - CS1
-//#define MAX6675_SS_PIN            HEATER_1_PIN  // TC2 - CS2
+//#define TEMP_0_CS_PIN             HEATER_0_PIN  // TC1 - CS1
+//#define TEMP_0_CS_PIN             HEATER_1_PIN  // TC2 - CS2
 
 //
 // Misc. Functions

Marlin/src/pins/stm32f4/pins_MKS_ROBIN_PRO_V2.h

 //
 // Thermocouples
 //
-//#define MAX6675_SS_PIN                    PE5   // TC1 - CS1
-//#define MAX6675_SS_PIN                    PE6   // TC2 - CS2
+//#define TEMP_0_CS_PIN                     PE5   // TC1 - CS1
+//#define TEMP_0_CS_PIN                     PE6   // TC2 - CS2
 
 //
 // Misc. Functions

ini/features.ini

                                          src_filter=+<src/module/TMC26X.cpp>
 HAS_L64XX                              = Arduino-L6470@0.8.0
                                          src_filter=+<src/libs/L64XX> +<src/module/stepper/L64xx.cpp> +<src/gcode/feature/L6470> +<src/HAL/shared/HAL_spi_L6470.cpp>
+LIB_INTERNAL_MAX31865                  = src_filter=+<src/libs/MAX31865.cpp>
 NEOPIXEL_LED                           = adafruit/Adafruit NeoPixel@~1.8.0
                                          src_filter=+<src/feature/leds/neopixel.cpp>
-TEMP_.+_IS_MAX31865                    = Adafruit MAX31865 library@~1.1.0
 I2C_AMMETER                            = peterus/INA226Lib@1.1.2
 USES_LIQUIDCRYSTAL                     = fmalpartida/LiquidCrystal@1.5.0
 USES_LIQUIDCRYSTAL_I2C                 = marcoschwartz/LiquidCrystal_I2C@1.1.4

platformio.ini

   -<src/gcode/units/M149.cpp>
   -<src/libs/BL24CXX.cpp> -<src/libs/W25Qxx.cpp>
   -<src/libs/L64XX> -<src/module/stepper/L64xx.cpp> -<src/HAL/shared/HAL_spi_L6470.cpp>
+  -<src/libs/MAX31865.cpp>
   -<src/libs/hex_print.cpp>
   -<src/libs/least_squares_fit.cpp>
   -<src/libs/nozzle.cpp> -<src/gcode/feature/clean>