Fix MAX31865 on SPI (PT100/1000) support (#20074)

Marlin/Configuration.h

@@ -436,11 +436,11 @@
 #define DUMMY_THERMISTOR_998_VALUE 25
 #define DUMMY_THERMISTOR_999_VALUE 100
 
-// Resistor values when using a MAX31865 (sensor -5)
-// Sensor value is typically 100 (PT100) or 1000 (PT1000)
-// Calibration value is typically 430 ohm for AdaFruit PT100 modules and 4300 ohm for AdaFruit PT1000 modules.
-//#define MAX31865_SENSOR_OHMS      100
-//#define MAX31865_CALIBRATION_OHMS 430
+// 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_SENSOR_OHMS_1      100
+//#define MAX31865_CALIBRATION_OHMS_1 430
 
 // Use temp sensor 1 as a redundant sensor with sensor 0. If the readings
 // from the two sensors differ too much the print will be aborted.

Marlin/src/inc/Conditionals_post.h

@@ -445,9 +445,9 @@
     #define HEATER_0_MAX6675_TMAX 1024
   #endif
   #if TEMP_SENSOR_0 == -5
-    #define MAX6675_IS_MAX31865 1
+    #define MAX6675_0_IS_MAX31865 1
   #elif TEMP_SENSOR_0 == -3
-    #define MAX6675_IS_MAX31855 1
+    #define MAX6675_0_IS_MAX31855 1
   #endif
 #elif TEMP_SENSOR_0 == -4
   #define HEATER_0_USES_AD8495 1
@@ -473,6 +473,11 @@
     #define HEATER_1_MAX6675_TMIN    0
     #define HEATER_1_MAX6675_TMAX 1024
   #endif
+  #if TEMP_SENSOR_1 == -5
+    #define MAX6675_1_IS_MAX31865 1
+  #elif TEMP_SENSOR_1 == -3
+    #define MAX6675_1_IS_MAX31855 1
+  #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."

Marlin/src/inc/SanityCheck.h

@@ -405,6 +405,10 @@
   #error "MAX6675_SS is now MAX6675_SS_PIN. Please update your configuration and/or pins."
 #elif defined(MAX6675_SS2)
   #error "MAX6675_SS2 is now MAX6675_SS2_PIN. Please update your configuration and/or pins."
+#elif defined(MAX31865_SENSOR_OHMS)
+  #error "MAX31865_SENSOR_OHMS is now MAX31865_SENSOR_OHMS_0. Please update your configuration."
+#elif defined(MAX31865_CALIBRATION_OHMS)
+  #error "MAX31865_CALIBRATION_OHMS is now MAX31865_CALIBRATION_OHMS_0. Please update your configuration."
 #elif defined(SPINDLE_LASER_ENABLE)
   #error "SPINDLE_LASER_ENABLE is now SPINDLE_FEATURE or LASER_FEATURE. Please update your Configuration_adv.h."
 #elif defined(SPINDLE_LASER_ENABLE_PIN)
@@ -1814,8 +1818,10 @@ static_assert(hbm[Z_AXIS] >= 0, "HOMING_BUMP_MM.Z must be greater than or equal
   #error "TEMP_SENSOR_1 is required with TEMP_SENSOR_1_AS_REDUNDANT."
 #endif
 
-#if MAX6675_IS_MAX31865 && !(defined(MAX31865_SENSOR_OHMS) && defined(MAX31865_CALIBRATION_OHMS))
-  #error "MAX31865_SENSOR_OHMS and MAX31865_CALIBRATION_OHMS must be set in Configuration.h when using a MAX31865 temperature sensor."
+#if MAX6675_0_IS_MAX31865 && !(defined(MAX31865_SENSOR_OHMS_0) && defined(MAX31865_CALIBRATION_OHMS_0))
+  #error "MAX31865_SENSOR_OHMS_0 and MAX31865_CALIBRATION_OHMS_0 must be set in Configuration.h if TEMP_SENSOR_0 is MAX31865."
+#elif MAX6675_1_IS_MAX31865 && !(defined(MAX31865_SENSOR_OHMS_1) && defined(MAX31865_CALIBRATION_OHMS_1))
+  #error "MAX31865_SENSOR_OHMS_1 and MAX31865_CALIBRATION_OHMS_1 must be set in Configuration.h if TEMP_SENSOR_1 is MAX31865."
 #endif
 
 /**

Marlin/src/module/temperature.cpp

@@ -44,30 +44,44 @@
   #include "../lcd/extui/ui_api.h"
 #endif
 
-#if MAX6675_IS_MAX31865
+#if MAX6675_0_IS_MAX31865 || MAX6675_1_IS_MAX31865
   #include <Adafruit_MAX31865.h>
-  #ifndef MAX31865_CS_PIN
-    #define MAX31865_CS_PIN     MAX6675_SS_PIN  // HW:49   SW:65    for example
+  #if MAX6675_0_IS_MAX31865 && !defined(MAX31865_CS_PIN) && PIN_EXISTS(MAX6675_SS)
+    #define MAX31865_CS_PIN   MAX6675_SS_PIN
+  #endif
+  #if MAX6675_1_IS_MAX31865 && !defined(MAX31865_CS2_PIN) && PIN_EXISTS(MAX6675_SS2)
+    #define MAX31865_CS2_PIN  MAX6675_SS2_PIN
   #endif
   #ifndef MAX31865_MOSI_PIN
-    #define MAX31865_MOSI_PIN   MOSI_PIN        //            63
+    #define MAX31865_MOSI_PIN MOSI_PIN
   #endif
   #ifndef MAX31865_MISO_PIN
-    #define MAX31865_MISO_PIN   MAX6675_DO_PIN  //            42
+    #define MAX31865_MISO_PIN MAX6675_DO_PIN
   #endif
   #ifndef MAX31865_SCK_PIN
-    #define MAX31865_SCK_PIN    MAX6675_SCK_PIN //            40
+    #define MAX31865_SCK_PIN  MAX6675_SCK_PIN
+  #endif
+  #if MAX6675_0_IS_MAX31865 && PIN_EXISTS(MAX31865_CS)
+    #define HAS_MAX31865 1
+    Adafruit_MAX31865 max31865_0 = Adafruit_MAX31865(MAX31865_CS_PIN
+      #if MAX31865_CS_PIN != MAX6675_SS_PIN
+        , MAX31865_MOSI_PIN, MAX31865_MISO_PIN, MAX31865_SCK_PIN // For software SPI also set MOSI/MISO/SCK
+      #endif
+    );
+  #endif
+  #if MAX6675_1_IS_MAX31865 && PIN_EXISTS(MAX31865_CS2)
+    #define HAS_MAX31865 1
+    Adafruit_MAX31865 max31865_1 = Adafruit_MAX31865(MAX31865_CS2_PIN
+      #if MAX31865_CS2_PIN != MAX6675_SS2_PIN
+        , MAX31865_MOSI_PIN, MAX31865_MISO_PIN, MAX31865_SCK_PIN // For software SPI also set MOSI/MISO/SCK
+      #endif
+    );
   #endif
-  Adafruit_MAX31865 max31865 = Adafruit_MAX31865(MAX31865_CS_PIN
-    #if MAX31865_CS_PIN != MAX6675_SS_PIN
-      , MAX31865_MOSI_PIN           // For software SPI also set MOSI/MISO/SCK
-      , MAX31865_MISO_PIN
-      , MAX31865_SCK_PIN
-    #endif
-  );
 #endif
 
-#define MAX6675_SEPARATE_SPI (EITHER(HEATER_0_USES_MAX6675, HEATER_1_USES_MAX6675) && PINS_EXIST(MAX6675_SCK, MAX6675_DO))
+#if EITHER(HEATER_0_USES_MAX6675, HEATER_1_USES_MAX6675) && PINS_EXIST(MAX6675_SCK, MAX6675_DO)
+  #define MAX6675_SEPARATE_SPI 1
+#endif
 
 #if MAX6675_SEPARATE_SPI
   #include "../libs/private_spi.h"
@@ -1471,13 +1485,7 @@ void Temperature::manage_heater() {
         #if HEATER_0_USER_THERMISTOR
           return user_thermistor_to_deg_c(CTI_HOTEND_0, raw);
         #elif HEATER_0_USES_MAX6675
-          return (
-            #if MAX6675_IS_MAX31865
-              max31865.temperature(MAX31865_SENSOR_OHMS, MAX31865_CALIBRATION_OHMS)
-            #else
-              raw * 0.25
-            #endif
-          );
+          return TERN(MAX6675_0_IS_MAX31865, max31865_0.temperature(MAX31865_SENSOR_OHMS_0, MAX31865_CALIBRATION_OHMS_0), raw * 0.25);
         #elif HEATER_0_USES_AD595
           return TEMP_AD595(raw);
         #elif HEATER_0_USES_AD8495
@@ -1489,7 +1497,7 @@ void Temperature::manage_heater() {
         #if HEATER_1_USER_THERMISTOR
           return user_thermistor_to_deg_c(CTI_HOTEND_1, raw);
         #elif HEATER_1_USES_MAX6675
-          return raw * 0.25;
+          return TERN(MAX6675_1_IS_MAX31865, max31865_1.temperature(MAX31865_SENSOR_OHMS_1, MAX31865_CALIBRATION_OHMS_1), raw * 0.25);
         #elif HEATER_1_USES_AD595
           return TEMP_AD595(raw);
         #elif HEATER_1_USES_AD8495
@@ -1691,7 +1699,8 @@ void Temperature::updateTemperaturesFromRawValues() {
  */
 void Temperature::init() {
 
-  TERN_(MAX6675_IS_MAX31865, max31865.begin(MAX31865_2WIRE)); // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
+  TERN_(MAX6675_0_IS_MAX31865, max31865_0.begin(MAX31865_2WIRE)); // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
+  TERN_(MAX6675_1_IS_MAX31865, max31865_1.begin(MAX31865_2WIRE));
 
   #if EARLY_WATCHDOG
     // Flag that the thermalManager should be running
@@ -2200,50 +2209,64 @@ void Temperature::disable_all_heaters() {
     #define THERMOCOUPLE_MAX_ERRORS 15
   #endif
 
-  int Temperature::read_max6675(
-    #if COUNT_6675 > 1
-      const uint8_t hindex
-    #endif
-  ) {
-    #if COUNT_6675 == 1
-      constexpr uint8_t hindex = 0;
-    #else
-      // Needed to return the correct temp when this is called too soon
-      static uint16_t max6675_temp_previous[COUNT_6675] = { 0 };
-    #endif
-
-    static uint8_t max6675_errors[COUNT_6675] = { 0 };
-
+  int Temperature::read_max6675(TERN_(HAS_MULTI_6675, const uint8_t hindex/*=0*/)) {
     #define MAX6675_HEAT_INTERVAL 250UL
 
-    #if MAX6675_IS_MAX31855
+    #if MAX6675_0_IS_MAX31855 || MAX6675_1_IS_MAX31855
       static uint32_t max6675_temp = 2000;
       #define MAX6675_ERROR_MASK    7
       #define MAX6675_DISCARD_BITS 18
-      #define MAX6675_SPEED_BITS    3  // (_BV(SPR1)) // clock ÷ 64
+      #define MAX6675_SPEED_BITS    3       // (_BV(SPR1)) // clock ÷ 64
+    #elif HAS_MAX31865
+      static uint16_t max6675_temp = 2000;  // From datasheet 16 bits D15-D0
+      #define MAX6675_ERROR_MASK    1       // D0 Bit not used
+      #define MAX6675_DISCARD_BITS  1       // Data is in D15-D1
+      #define MAX6675_SPEED_BITS    3       //  (_BV(SPR1)) // clock ÷ 64
     #else
       static uint16_t max6675_temp = 2000;
       #define MAX6675_ERROR_MASK    4
       #define MAX6675_DISCARD_BITS  3
-      #define MAX6675_SPEED_BITS    2  // (_BV(SPR0)) // clock ÷ 16
+      #define MAX6675_SPEED_BITS    2       // (_BV(SPR0)) // clock ÷ 16
     #endif
 
+    #if HAS_MULTI_6675
+      // Needed to return the correct temp when this is called between readings
+      static uint16_t max6675_temp_previous[COUNT_6675] = { 0 };
+      #define MAX6675_TEMP(I) max6675_temp_previous[I]
+      #define MAX6675_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)
+    #else
+      constexpr uint8_t hindex = 0;
+      #define MAX6675_TEMP(I) max6675_temp
+      #if MAX6675_1_IS_MAX31865
+        #define MAX6675_SEL(A,B) B
+      #else
+        #define MAX6675_SEL(A,B) A
+      #endif
+      #if HEATER_0_USES_MAX6675
+        #define MAX6675_WRITE(V)          WRITE(MAX6675_SS_PIN, V)
+        #define MAX6675_SET_OUTPUT() SET_OUTPUT(MAX6675_SS_PIN)
+      #else
+        #define MAX6675_WRITE(V)          WRITE(MAX6675_SS2_PIN, V)
+        #define MAX6675_SET_OUTPUT() SET_OUTPUT(MAX6675_SS2_PIN)
+      #endif
+    #endif
+
+    static uint8_t max6675_errors[COUNT_6675] = { 0 };
+
     // Return last-read value between readings
     static millis_t next_max6675_ms[COUNT_6675] = { 0 };
     millis_t ms = millis();
-    if (PENDING(ms, next_max6675_ms[hindex]))
-      return int(
-        #if COUNT_6675 == 1
-          max6675_temp
-        #else
-          max6675_temp_previous[hindex] // Need to return the correct previous value
-        #endif
-      );
-
+    if (PENDING(ms, next_max6675_ms[hindex])) return int(MAX6675_TEMP(hindex));
     next_max6675_ms[hindex] = ms + MAX6675_HEAT_INTERVAL;
 
-    #if MAX6675_IS_MAX31865
-      max6675_temp = int(max31865.temperature(MAX31865_SENSOR_OHMS, MAX31865_CALIBRATION_OHMS));
+    #if HAS_MAX31865
+      Adafruit_MAX31865 &maxref = MAX6675_SEL(max31865_0, max31865_1);
+      max6675_temp = int(maxref.temperature(
+        MAX6675_SEL(MAX31865_SENSOR_OHMS_0, MAX31865_SENSOR_OHMS_1),
+        MAX6675_SEL(MAX31865_CALIBRATION_OHMS_0, MAX31865_CALIBRATION_OHMS_1)
+      ));
     #endif
 
     //
@@ -2254,39 +2277,24 @@ void Temperature::disable_all_heaters() {
       spiInit(MAX6675_SPEED_BITS);
     #endif
 
-    #if COUNT_6675 > 1
-      #define WRITE_MAX6675(V) do{ switch (hindex) { case 1: WRITE(MAX6675_SS2_PIN, V); break; default: WRITE(MAX6675_SS_PIN, V); } }while(0)
-      #define SET_OUTPUT_MAX6675() do{ switch (hindex) { case 1: SET_OUTPUT(MAX6675_SS2_PIN); break; default: SET_OUTPUT(MAX6675_SS_PIN); } }while(0)
-    #elif HEATER_1_USES_MAX6675
-      #define WRITE_MAX6675(V) WRITE(MAX6675_SS2_PIN, V)
-      #define SET_OUTPUT_MAX6675() SET_OUTPUT(MAX6675_SS2_PIN)
-    #else
-      #define WRITE_MAX6675(V) WRITE(MAX6675_SS_PIN, V)
-      #define SET_OUTPUT_MAX6675() SET_OUTPUT(MAX6675_SS_PIN)
-    #endif
-
-    SET_OUTPUT_MAX6675();
-    WRITE_MAX6675(LOW);  // enable TT_MAX6675
+    MAX6675_SET_OUTPUT();
+    MAX6675_WRITE(LOW);  // enable TT_MAX6675
 
     DELAY_NS(100);       // Ensure 100ns delay
 
     // Read a big-endian temperature value
     max6675_temp = 0;
     for (uint8_t i = sizeof(max6675_temp); i--;) {
-      max6675_temp |= (
-        #if MAX6675_SEPARATE_SPI
-          max6675_spi.receive()
-        #else
-          spiRec()
-        #endif
-      );
+      max6675_temp |= TERN(MAX6675_SEPARATE_SPI, max6675_spi.receive(), spiRec());
       if (i > 0) max6675_temp <<= 8; // shift left if not the last byte
     }
 
-    WRITE_MAX6675(HIGH); // disable TT_MAX6675
+    MAX6675_WRITE(HIGH); // disable TT_MAX6675
+
+    const uint8_t fault_31865 = TERN1(HAS_MAX31865, maxref.readFault());
 
-    if (DISABLED(IGNORE_THERMOCOUPLE_ERRORS) && (max6675_temp & MAX6675_ERROR_MASK)) {
-      max6675_errors[hindex] += 1;
+    if (DISABLED(IGNORE_THERMOCOUPLE_ERRORS) && (max6675_temp & MAX6675_ERROR_MASK) && fault_31865) {
+      max6675_errors[hindex]++;
       if (max6675_errors[hindex] > THERMOCOUPLE_MAX_ERRORS) {
         SERIAL_ERROR_START();
         SERIAL_ECHOPGM("Temp measurement error! ");
@@ -2298,18 +2306,29 @@ void Temperature::disable_all_heaters() {
             SERIAL_ECHOLNPGM("Short to GND");
           else if (max6675_temp & 4)
             SERIAL_ECHOLNPGM("Short to VCC");
+        #elif HAS_MAX31865
+          if (fault_31865) {
+            maxref.clearFault();
+            SERIAL_ECHOPAIR("MAX31865 Fault :(", fault_31865, ")  >>");
+            if (fault_31865 & MAX31865_FAULT_HIGHTHRESH)
+              SERIAL_ECHOLNPGM("RTD High Threshold");
+            else if (fault_31865 & MAX31865_FAULT_LOWTHRESH)
+              SERIAL_ECHOLNPGM("RTD Low Threshold");
+            else if (fault_31865 & MAX31865_FAULT_REFINLOW)
+              SERIAL_ECHOLNPGM("REFIN- > 0.85 x Bias");
+            else if (fault_31865 & MAX31865_FAULT_REFINHIGH)
+              SERIAL_ECHOLNPGM("REFIN- < 0.85 x Bias - FORCE- open");
+            else if (fault_31865 & MAX31865_FAULT_RTDINLOW)
+              SERIAL_ECHOLNPGM("REFIN- < 0.85 x Bias - FORCE- open");
+            else if (fault_31865 & MAX31865_FAULT_OVUV)
+              SERIAL_ECHOLNPGM("Under/Over voltage");
+          }
         #else
           SERIAL_ECHOLNPGM("MAX6675");
         #endif
 
         // Thermocouple open
-        max6675_temp = 4 * (
-          #if COUNT_6675 > 1
-            hindex ? HEATER_1_MAX6675_TMAX : HEATER_0_MAX6675_TMAX
-          #else
-            TERN(HEATER_1_USES_MAX6675, HEATER_1_MAX6675_TMAX, HEATER_0_MAX6675_TMAX)
-          #endif
-        );
+        max6675_temp = 4 * MAX6675_SEL(HEATER_0_MAX6675_TMAX, HEATER_1_MAX6675_TMAX);
       }
       else
         max6675_temp >>= MAX6675_DISCARD_BITS;
@@ -2319,13 +2338,11 @@ void Temperature::disable_all_heaters() {
       max6675_errors[hindex] = 0;
     }
 
-    #if ENABLED(MAX6675_IS_MAX31855)
+    #if MAX6675_0_IS_MAX31855 || MAX6675_1_IS_MAX31855
       if (max6675_temp & 0x00002000) max6675_temp |= 0xFFFFC000; // Support negative temperature
     #endif
 
-    #if COUNT_6675 > 1
-      max6675_temp_previous[hindex] = max6675_temp;
-    #endif
+    MAX6675_TEMP(hindex) = max6675_temp;
 
     return int(max6675_temp);
   }

Marlin/src/module/temperature.h

@@ -811,7 +811,7 @@ class Temperature {
     #if HAS_MAX6675
       #define COUNT_6675 1 + BOTH(HEATER_0_USES_MAX6675, HEATER_1_USES_MAX6675)
       #if COUNT_6675 > 1
-        #define HAS_MULTI_6675
+        #define HAS_MULTI_6675 1
         #define READ_MAX6675(N) read_max6675(N)
       #else
         #define READ_MAX6675(N) read_max6675()

buildroot/share/PlatformIO/variants/archim/variant.h

@@ -55,10 +55,10 @@ extern "C"{
  *----------------------------------------------------------------------------*/
 
 // Number of pins defined in PinDescription array
-#define PINS_COUNT           (79U)
-#define NUM_DIGITAL_PINS     (66U)
-#define NUM_ANALOG_INPUTS    (12U)
-#define analogInputToDigitalPin(p)  ((p < 12U) ? (p) + 54U : -1)
+#define PINS_COUNT           79
+#define NUM_DIGITAL_PINS     66
+#define NUM_ANALOG_INPUTS    12
+#define analogInputToDigitalPin(p)  ((p < 12) ? (p) + 54 : -1)
 
 #define digitalPinToPort(P)        ( g_APinDescription[P].pPort )
 #define digitalPinToBitMask(P)     ( g_APinDescription[P].ulPin )

platformio.ini

@@ -222,7 +222,7 @@ HAS_L64XX               = Arduino-L6470@0.8.0
                           src_filter=+<src/libs/L64XX> +<src/module/stepper/L64xx.cpp> +<src/gcode/feature/L6470>
 NEOPIXEL_LED            = Adafruit NeoPixel@1.5.0
                           src_filter=+<src/feature/leds/neopixel.cpp>
-MAX6675_IS_MAX31865     = Adafruit MAX31865 library@~1.1.0
+MAX6675_._IS_MAX31865   = Adafruit MAX31865 library@~1.1.0
 USES_LIQUIDCRYSTAL      = LiquidCrystal@1.5.0
 USES_LIQUIDCRYSTAL_I2C  = marcoschwartz/LiquidCrystal_I2C@1.1.4
 USES_LIQUIDTWI2         = LiquidTWI2@1.2.7