Improve U8G+SPI delay override (#18386)

Co-authored-by: Scott Lahteine <github@thinkyhead.com>

Marlin/src/inc/Conditionals_LCD.h

 #elif ENABLED(CR10_STOCKDISPLAY)
 
   #define IS_RRD_FG_SC
-  #ifndef ST7920_DELAY_1
-    #define ST7920_DELAY_1 DELAY_NS(125)
-  #endif
-  #ifndef ST7920_DELAY_2
-    #define ST7920_DELAY_2 DELAY_NS(125)
-  #endif
-  #ifndef ST7920_DELAY_3
-    #define ST7920_DELAY_3 DELAY_NS(125)
-  #endif
+  #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
+  #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
+  #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
 
 #elif ENABLED(MKS_12864OLED)
 

Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp

 #include "ultralcd_st7920_u8glib_rrd_AVR.h"
 
 #ifndef ST7920_DELAY_1
-  #define ST7920_DELAY_1 CPU_ST7920_DELAY_1
+  #ifdef BOARD_ST7920_DELAY_1
+    #define ST7920_DELAY_1 BOARD_ST7920_DELAY_1
+  #else
+    #define ST7920_DELAY_1 CPU_ST7920_DELAY_1
+  #endif
 #endif
 #ifndef ST7920_DELAY_2
-  #define ST7920_DELAY_2 CPU_ST7920_DELAY_2
+  #ifdef BOARD_ST7920_DELAY_2
+    #define ST7920_DELAY_2 BOARD_ST7920_DELAY_2
+  #else
+    #define ST7920_DELAY_2 CPU_ST7920_DELAY_2
+  #endif
 #endif
 #ifndef ST7920_DELAY_3
-  #define ST7920_DELAY_3 CPU_ST7920_DELAY_3
+  #ifdef BOARD_ST7920_DELAY_3
+    #define ST7920_DELAY_3 BOARD_ST7920_DELAY_3
+  #else
+    #define ST7920_DELAY_3 CPU_ST7920_DELAY_3
+  #endif
 #endif
 
 // Optimize this code with -O3
 #pragma GCC optimize (3)
 
-
 #ifdef ARDUINO_ARCH_STM32F1
   #define ST7920_DAT(V) !!((V) & 0x80)
 #else

Marlin/src/pins/mega/pins_PICA.h

 //
 // Servos
 //
-#define SERVO0_PIN                           3
-#define SERVO1_PIN                           4
-#define SERVO2_PIN                           5
+#define SERVO0_PIN                             3
+#define SERVO1_PIN                             4
+#define SERVO2_PIN                             5
 //
 // Limit Switches
 //

Marlin/src/pins/ramps/pins_FORMBOT_TREX2PLUS.h

 #pragma once
 
 /**
- * Override default LCD timing for Formbot T-Rex 2+ machines.
- * The long LCD cables and the routing near electrically noisy stepper motors
- * requires a slightly longer setup and hold time on the signals.
- */
-#define BOARD_ST7920_DELAY_1 DELAY_NS(200)
-#define BOARD_ST7920_DELAY_2 DELAY_NS(200)
-#define BOARD_ST7920_DELAY_3 DELAY_NS(200)
-
-/**
  * Formbot pin assignments
  */
 
   #define LCD_PINS_D6                         27
   #define LCD_PINS_D7                         29
 #endif
+
+#if HAS_GRAPHICAL_LCD
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1 DELAY_NS(200)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2 DELAY_NS(200)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(200)
+  #endif
+#endif

Marlin/src/pins/sanguino/pins_MELZI_CREALITY.h

 
 // Alter timing for graphical display
 #if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
+  #endif
 #endif
 
 #include "pins_MELZI.h"

Marlin/src/pins/sanguino/pins_MELZI_MALYAN.h

 
 // Alter timing for graphical display
 #if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
+  #endif
 #endif
 
 #include "pins_MELZI.h"

Marlin/src/pins/sanguino/pins_MELZI_TRONXY.h

 #define BOARD_INFO_NAME "Melzi (Tronxy)"
 
 #if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(0)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(0)
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1 DELAY_NS(0)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(0)
+  #endif
 #endif
 
 #include "pins_MELZI.h"

Marlin/src/pins/sanguino/pins_MELZI_V2.h

 
 #define BOARD_INFO_NAME "Melzi V2"
 
-#if ENABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER)
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(0)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(188)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(0)
+#if HAS_GRAPHICAL_LCD
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1 DELAY_NS(0)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2 DELAY_NS(188)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(0)
+  #endif
 #endif
 
 #include "pins_MELZI.h"

Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_V1_1.h

 
     #else                                         // !FYSETC_MINI_12864
 
-    #define LCD_PINS_D4                     PC13
-    #if ENABLED(ULTIPANEL)
-      #define LCD_PINS_D5                   PB7
-      #define LCD_PINS_D6                   PC15
-      #define LCD_PINS_D7                   PC14
-    #endif
+      #define LCD_PINS_D4                   PC13
+      #if ENABLED(ULTIPANEL)
+        #define LCD_PINS_D5                 PB7
+        #define LCD_PINS_D6                 PC15
+        #define LCD_PINS_D7                 PC14
+      #endif
 
     #endif // !FYSETC_MINI_12864
 
+    #if HAS_GRAPHICAL_LCD
+      #ifndef BOARD_ST7920_DELAY_1
+        #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
+      #endif
+      #ifndef BOARD_ST7920_DELAY_2
+        #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
+      #endif
+      #ifndef BOARD_ST7920_DELAY_3
+        #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
+      #endif
+    #endif
+
   #endif
 
 #endif // HAS_SPI_LCD
 #endif
 #define ON_BOARD_SPI_DEVICE 1                     // SPI1
 #define ONBOARD_SD_CS_PIN                   PA4   // Chip select for "System" SD card
-
-#if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
-#endif

Marlin/src/pins/stm32f1/pins_CCROBOT_MEEB_3DP.h

 //
 #if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
   #define FLASH_EEPROM_EMULATION
-  #define EEPROM_PAGE_SIZE     0x800U             // 2KB
+  #define EEPROM_PAGE_SIZE 0x800U                 // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #define MARLIN_EEPROM_SIZE   0x1000             // 4KB
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
 #endif
 
 //
 
 // Alter timing for graphical display
 #if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
+  #endif
 #endif
 
 //

Marlin/src/pins/stm32f1/pins_CHITU3D_V5.h

   // SoC Flash (framework-arduinoststm32-maple/STM32F1/libraries/EEPROM/EEPROM.h)
   #define EEPROM_START_ADDRESS (0x8000000UL + (512 * 1024) - 2 * EEPROM_PAGE_SIZE)
   #define EEPROM_PAGE_SIZE     (0x800U)     // 2KB, but will use 2x more (4KB)
-  #define MARLIN_EEPROM_SIZE EEPROM_PAGE_SIZE
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE
 #else
-  #define MARLIN_EEPROM_SIZE 0x800U         // On SD, Limit to 2KB, require this amount of RAM
+  #define MARLIN_EEPROM_SIZE 0x800U               // On SD, Limit to 2KB, require this amount of RAM
 #endif
 
 //

Marlin/src/pins/stm32f1/pins_CHITU3D_V6.h

   // SoC Flash (framework-arduinoststm32-maple/STM32F1/libraries/EEPROM/EEPROM.h)
   #define EEPROM_START_ADDRESS (0x8000000UL + (512 * 1024) - 2 * EEPROM_PAGE_SIZE)
   #define EEPROM_PAGE_SIZE     (0x800U)     // 2KB, but will use 2x more (4KB)
-  #define MARLIN_EEPROM_SIZE EEPROM_PAGE_SIZE
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE
 #else
-  #define MARLIN_EEPROM_SIZE 0x800U         // On SD, Limit to 2KB, require this amount of RAM
+  #define MARLIN_EEPROM_SIZE 0x800U               // On SD, Limit to 2KB, require this amount of RAM
 #endif
 
 //

Marlin/src/pins/stm32f1/pins_CREALITY_V4.h

 #define SD_DETECT_PIN                       PC7
 #define SDCARD_CONNECTION                ONBOARD
 #define ON_BOARD_SPI_DEVICE 1
-#define ONBOARD_SD_CS_PIN                   PA4  // SDSS
+#define ONBOARD_SD_CS_PIN                   PA4   // SDSS
 #define SDIO_SUPPORT
 
 #if ENABLED(RET6_12864_LCD)

Marlin/src/pins/stm32f1/pins_GTM32_MINI.h

   #endif
 
   #if HAS_GRAPHICAL_LCD
-    #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
-    #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
-    #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+    #ifndef BOARD_ST7920_DELAY_1
+      #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_2
+      #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_3
+      #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+    #endif
   #endif
 
 #endif // HAS_SPI_LCD

Marlin/src/pins/stm32f1/pins_GTM32_PRO_VB.h

   #endif
 
   #if HAS_GRAPHICAL_LCD
-    #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
-    #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
-    #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+    #ifndef BOARD_ST7920_DELAY_1
+      #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_2
+      #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_3
+      #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+    #endif
   #endif
 
 #endif // HAS_SPI_LCD

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3_common.h

   #define FLASH_EEPROM_EMULATION
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #define MARLIN_EEPROM_SIZE   EEPROM_PAGE_SIZE  // 2KB
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE  // 2KB
 #endif
 
 //

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_LITE.h

 
   #endif // !MKS_MINI_12864
 
+  #if HAS_GRAPHICAL_LCD
+    #ifndef BOARD_ST7920_DELAY_1
+      #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_2
+      #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_3
+      #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
+    #endif
+  #endif
+
 #endif // HAS_SPI_LCD
 
 // Motor current PWM pins
 #define MISO_PIN                            P1B4
 #define MOSI_PIN                            P1B5
 #define SS_PIN                              PA15
-
-#if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
-#endif

Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h

 
   // Alter timing for graphical display
   #if HAS_GRAPHICAL_LCD
-    #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
-    #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
-    #define BOARD_ST7920_DELAY_3 DELAY_NS(600)
+    #ifndef BOARD_ST7920_DELAY_1
+      #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_2
+      #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_3
+      #define BOARD_ST7920_DELAY_3 DELAY_NS(600)
+    #endif
   #endif
 
 #endif // HAS_SPI_LCD

Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h

     #define LCD_PINS_ENABLE                 PG5
     #define LCD_PINS_D4                     PG7
 
-    //#undef ST7920_DELAY_1
-    //#undef ST7920_DELAY_2
-    //#undef ST7920_DELAY_3
+    // CR10_STOCKDISPLAY default timing is too fast
+    #undef BOARD_ST7920_DELAY_1
+    #undef BOARD_ST7920_DELAY_2
+    #undef BOARD_ST7920_DELAY_3
 
   #else
 
 
   // Alter timing for graphical display
   #if HAS_GRAPHICAL_LCD
-    #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
-    #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
-    #define BOARD_ST7920_DELAY_3 DELAY_NS(600)
+    #ifndef BOARD_ST7920_DELAY_1
+      #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_2
+      #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_3
+      #define BOARD_ST7920_DELAY_3 DELAY_NS(600)
+    #endif
   #endif
 
   //#define DOGLCD_CS                       PB12

Marlin/src/pins/stm32f4/pins_BTT_SKR_PRO_common.h

     #define LCD_PINS_ENABLE                 PG7
     #define LCD_PINS_D4                     PG3
 
-    // CR10_Stock Display needs a different delay setting on SKR PRO v1.1, so undef it here.
-    // It will be defined again at the #HAS_GRAPHICAL_LCD section below.
-    #undef ST7920_DELAY_1
-    #undef ST7920_DELAY_2
-    #undef ST7920_DELAY_3
+    // CR10_STOCKDISPLAY default timing is too fast
+    #undef BOARD_ST7920_DELAY_1
+    #undef BOARD_ST7920_DELAY_2
+    #undef BOARD_ST7920_DELAY_3
 
   #elif ENABLED(MKS_MINI_12864)
     #define DOGLCD_A0                       PG6
 
   // Alter timing for graphical display
   #if HAS_GRAPHICAL_LCD
-    #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
-    #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
-    #define BOARD_ST7920_DELAY_3 DELAY_NS(600)
+    #ifndef BOARD_ST7920_DELAY_1
+      #define BOARD_ST7920_DELAY_1  DELAY_NS(96)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_2
+      #define BOARD_ST7920_DELAY_2  DELAY_NS(48)
+    #endif
+    #ifndef BOARD_ST7920_DELAY_3
+      #define BOARD_ST7920_DELAY_3 DELAY_NS(600)
+    #endif
   #endif
 
 #endif // HAS_SPI_LCD

Marlin/src/pins/stm32f4/pins_FYSETC_S6.h

     #define LCD_PINS_ENABLE                 PD1
     #define LCD_PINS_D4                     PC12
 
-    // CR10_Stock Display needs a different delay setting on SKR PRO v1.1, so undef it here.
-    // It will be defined again at the #HAS_GRAPHICAL_LCD section below.
-    #undef ST7920_DELAY_1
-    #undef ST7920_DELAY_2
-    #undef ST7920_DELAY_3
+    // CR10_STOCKDISPLAY default timing is too fast
+    #undef BOARD_ST7920_DELAY_1
+    #undef BOARD_ST7920_DELAY_2
+    #undef BOARD_ST7920_DELAY_3
 
   #else
 

Marlin/src/pins/stm32f4/pins_GENERIC_STM32F4.h

 // ST7920 Delays
 //
 #if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1  DELAY_NS(96)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2  DELAY_NS(48)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+  #endif
 #endif

Marlin/src/pins/stm32f4/pins_LERDGE_K.h

 // ST7920 Delays
 //
 #if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1  DELAY_NS(96)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2  DELAY_NS(48)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+  #endif
 #endif

Marlin/src/pins/stm32f4/pins_LERDGE_X.h

 // ST7920 Delays
 //
 #if HAS_GRAPHICAL_LCD
-  #define BOARD_ST7920_DELAY_1 DELAY_NS(96)
-  #define BOARD_ST7920_DELAY_2 DELAY_NS(48)
-  #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+  #ifndef BOARD_ST7920_DELAY_1
+    #define BOARD_ST7920_DELAY_1  DELAY_NS(96)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_2
+    #define BOARD_ST7920_DELAY_2  DELAY_NS(48)
+  #endif
+  #ifndef BOARD_ST7920_DELAY_3
+    #define BOARD_ST7920_DELAY_3 DELAY_NS(715)
+  #endif
 #endif

Marlin/src/pins/stm32f4/pins_RUMBA32_MKS.h

 
 #if NO_EEPROM_SELECTED
   #define FLASH_EEPROM_EMULATION
-  #define MARLIN_EEPROM_SIZE 0x1000             // 4KB
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
 #endif
 
 #if ENABLED(FLASH_EEPROM_EMULATION)

Marlin/src/pins/stm32f4/pins_RUMBA32_common.h

 // TIM7 is used for SERVO
 // TIMER_SERIAL defaults to TIM7 so we'll override it here
 //
-#define STEP_TIMER                          10
-#define TEMP_TIMER                          14
+#define STEP_TIMER 10
+#define TEMP_TIMER 14
 #define TIMER_SERIAL                        TIM9
-#define HAL_TIMER_RATE                      F_CPU
+#define HAL_TIMER_RATE                     F_CPU
 
 //
 // Limit Switches

Marlin/src/pins/teensy2/pins_PRINTRBOARD_REVF.h

     //#define MOSI                            22  //         12               B2                ICSP-03             EXP2-05
     //#define MISO                            23  //         13               B3                ICSP-06             EXP2-05
 
-    // increase delays
+    // Alter timing for graphical display
     #define BOARD_ST7920_DELAY_1 DELAY_NS(313)
     #define BOARD_ST7920_DELAY_2 DELAY_NS(313)
     #define BOARD_ST7920_DELAY_3 DELAY_NS(313)