add uart sanity checks for stm32 boards starting with creality v4 boards

Marlin/Configuration_adv.h

@@ -1152,7 +1152,7 @@
 #endif
 
 /**
- * Automatic backlash, position and hotend offset calibration
+ * Automatic backlash, position, and hotend offset calibration
  *
  * Enable G425 to run automatic calibration using an electrically-
  * conductive cube, bolt, or washer mounted on the bed.

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

@@ -40,13 +40,15 @@
 #if SERIAL_IN_USE(0)
   // D0-D1. No known conflicts.
 #endif
-#if NOT_TARGET(__AVR_ATmega644P__, __AVR_ATmega1284P__)
-  #if SERIAL_IN_USE(1) && (CHECK_SERIAL_PIN(18) || CHECK_SERIAL_PIN(19))
-    #error "Serial Port 1 pin D18 and/or D19 conflicts with another pin on the board."
-  #endif
-#else
-  #if SERIAL_IN_USE(1) && (CHECK_SERIAL_PIN(10) || CHECK_SERIAL_PIN(11))
-    #error "Serial Port 1 pin D10 and/or D11 conflicts with another pin on the board."
+#if SERIAL_IN_USE(1)
+  #if NOT_TARGET(__AVR_ATmega644P__, __AVR_ATmega1284P__)
+    #if CHECK_SERIAL_PIN(18) || CHECK_SERIAL_PIN(19)
+      #error "Serial Port 1 pin D18 and/or D19 conflicts with another pin on the board."
+    #endif
+  #else
+    #if CHECK_SERIAL_PIN(10) || CHECK_SERIAL_PIN(11)
+      #error "Serial Port 1 pin D10 and/or D11 conflicts with another pin on the board."
+    #endif
   #endif
 #endif
 #if SERIAL_IN_USE(2) && (CHECK_SERIAL_PIN(16) || CHECK_SERIAL_PIN(17))

Marlin/src/HAL/STM32/inc/SanityCheck.h

@@ -50,3 +50,62 @@
 #if ANY(TFT_COLOR_UI, TFT_LVGL_UI, TFT_CLASSIC_UI) && NOT_TARGET(STM32H7xx, STM32F4xx, STM32F1xx)
   #error "TFT_COLOR_UI, TFT_LVGL_UI and TFT_CLASSIC_UI are currently only supported on STM32H7, STM32F4 and STM32F1 hardware."
 #endif
+
+/**
+ * Check for common serial pin conflicts
+ */
+#define _CHECK_SERIAL_PIN(N) (( \
+    BTN_EN1 == N || DOGLCD_CS == N || HEATER_BED_PIN == N || FAN_PIN == N || \
+    SDIO_D2_PIN == N || SDIO_D3_PIN == N || SDIO_CK_PIN == N || SDIO_CMD_PIN == N \
+  ))
+#define CHECK_SERIAL_PIN(T,N) defined(UART##N##_##T##_PIN) && _CHECK_SERIAL_PIN(UART##N##_##T##_PIN)
+#if SERIAL_IN_USE(1)
+  #if CHECK_SERIAL_PIN(TX,1)
+    #error "Serial Port 1 TX IO pins conflict with another pin on the board."
+  #endif
+  #if CHECK_SERIAL_PIN(RX,1)
+    #error "Serial Port 1 RX IO pins conflict with another pin on the board."
+  #endif
+#endif
+#if SERIAL_IN_USE(2)
+  #if CHECK_SERIAL_PIN(TX,2)
+    #error "Serial Port 2 TX IO pins conflict with another pin on the board."
+  #endif
+  #if CHECK_SERIAL_PIN(RX,2)
+    #error "Serial Port 2 RX IO pins conflict with another pin on the board."
+  #endif
+#endif
+#if SERIAL_IN_USE(3)
+  #if CHECK_SERIAL_PIN(TX,3)
+    #error "Serial Port 3 TX IO pins conflict with another pin on the board."
+  #endif
+  #if CHECK_SERIAL_PIN(RX,3)
+    #error "Serial Port 3 RX IO pins conflict with another pin on the board."
+  #endif
+#endif
+#if SERIAL_IN_USE(4)
+  #if CHECK_SERIAL_PIN(TX,4)
+    #error "Serial Port 4 TX IO pins conflict with another pin on the board."
+  #endif
+  #if CHECK_SERIAL_PIN(RX,4)
+    #error "Serial Port 4 RX IO pins conflict with another pin on the board."
+  #endif
+#endif
+#if SERIAL_IN_USE(5)
+  #if CHECK_SERIAL_PIN(TX,5)
+    #error "Serial Port 5 TX IO pins conflict with another pin on the board."
+  #endif
+  #if CHECK_SERIAL_PIN(RX,5)
+    #error "Serial Port 5 RX IO pins conflict with another pin on the board."
+  #endif
+#endif
+#if SERIAL_IN_USE(6)
+  #if CHECK_SERIAL_PIN(TX,6)
+    #error "Serial Port 6 TX IO pins conflict with another pin on the board."
+  #endif
+  #if CHECK_SERIAL_PIN(RX,6)
+    #error "Serial Port 6 RX IO pins conflict with another pin on the board."
+  #endif
+#endif
+#undef CHECK_SERIAL_PIN
+#undef _CHECK_SERIAL_PIN

Marlin/src/inc/Conditionals_post.h

@@ -2446,11 +2446,11 @@
 //
 
 // Flag the indexed hardware serial ports in use
-#define SERIAL_IN_USE(N) (  (defined(SERIAL_PORT)      && SERIAL_PORT == N) \
-                          || (defined(SERIAL_PORT_2)    && SERIAL_PORT_2 == N) \
-                          || (defined(SERIAL_PORT_3)    && SERIAL_PORT_3 == N) \
-                          || (defined(MMU2_SERIAL_PORT) && MMU2_SERIAL_PORT == N) \
-                          || (defined(LCD_SERIAL_PORT)  && LCD_SERIAL_PORT == N) )
+#define SERIAL_IN_USE(N) (   (defined(SERIAL_PORT)      && N == SERIAL_PORT) \
+                          || (defined(SERIAL_PORT_2)    && N == SERIAL_PORT_2) \
+                          || (defined(SERIAL_PORT_3)    && N == SERIAL_PORT_3) \
+                          || (defined(MMU2_SERIAL_PORT) && N == MMU2_SERIAL_PORT) \
+                          || (defined(LCD_SERIAL_PORT)  && N == LCD_SERIAL_PORT) )
 
 // Flag the named hardware serial ports in use
 #define TMC_UART_IS(A,N) (defined(A##_HARDWARE_SERIAL) && (CAT(HW_,A##_HARDWARE_SERIAL) == HW_Serial##N || CAT(HW_,A##_HARDWARE_SERIAL) == HW_MSerial##N))

Marlin/src/pins/pinsDebug_list.h

@@ -2231,6 +2231,80 @@
   REPORT_NAME_DIGITAL(__LINE__, TFT_RESET_PIN)
 #endif
 
+//
+// Hardware UART
+//
+#if SERIAL_IN_USE(1)
+  #if PIN_EXISTS(UART1_TX)
+    REPORT_NAME_DIGITAL(__LINE__, UART1_TX_PIN)
+  #endif
+  #if PIN_EXISTS(UART1_RX)
+    REPORT_NAME_DIGITAL(__LINE__, UART1_RX_PIN)
+  #endif
+#endif
+#if SERIAL_IN_USE(2)
+  #if PIN_EXISTS(UART2_TX)
+    REPORT_NAME_DIGITAL(__LINE__, UART2_TX_PIN)
+  #endif
+  #if PIN_EXISTS(UART2_RX)
+    REPORT_NAME_DIGITAL(__LINE__, UART2_RX_PIN)
+  #endif
+#endif
+#if SERIAL_IN_USE(3)
+  #if PIN_EXISTS(UART3_TX)
+    REPORT_NAME_DIGITAL(__LINE__, UART3_TX_PIN)
+  #endif
+  #if PIN_EXISTS(UART3_RX)
+    REPORT_NAME_DIGITAL(__LINE__, UART3_RX_PIN)
+  #endif
+#endif
+#if SERIAL_IN_USE(4)
+  #if PIN_EXISTS(UART4_TX)
+    REPORT_NAME_DIGITAL(__LINE__, UART4_TX_PIN)
+  #endif
+  #if PIN_EXISTS(UART4_RX)
+    REPORT_NAME_DIGITAL(__LINE__, UART4_RX_PIN)
+  #endif
+#endif
+#if SERIAL_IN_USE(5)
+  #if PIN_EXISTS(UART5_TX)
+    REPORT_NAME_DIGITAL(__LINE__, UART5_TX_PIN)
+  #endif
+  #if PIN_EXISTS(UART5_RX)
+    REPORT_NAME_DIGITAL(__LINE__, UART5_RX_PIN)
+  #endif
+#endif
+#if SERIAL_IN_USE(6)
+  #if PIN_EXISTS(UART6_TX)
+    REPORT_NAME_DIGITAL(__LINE__, UART6_TX_PIN)
+  #endif
+  #if PIN_EXISTS(UART6_RX)
+    REPORT_NAME_DIGITAL(__LINE__, UART6_RX_PIN)
+  #endif
+#endif
+
+//
+// SDIO
+//
+#if PIN_EXISTS(SDIO_D0)
+  REPORT_NAME_DIGITAL(__LINE__, SDIO_D0_PIN)
+#endif
+#if PIN_EXISTS(SDIO_D1)
+  REPORT_NAME_DIGITAL(__LINE__, SDIO_D1_PIN)
+#endif
+#if PIN_EXISTS(SDIO_D2)
+  REPORT_NAME_DIGITAL(__LINE__, SDIO_D2_PIN)
+#endif
+#if PIN_EXISTS(SDIO_D3)
+  REPORT_NAME_DIGITAL(__LINE__, SDIO_D3_PIN)
+#endif
+#if PIN_EXISTS(SDIO_CK)
+  REPORT_NAME_DIGITAL(__LINE__, SDIO_CK_PIN)
+#endif
+#if PIN_EXISTS(SDIO_CMD)
+  REPORT_NAME_DIGITAL(__LINE__, SDIO_CMD_PIN)
+#endif
+
 //
 // Miscellaneous
 //

Marlin/src/pins/stm32f1/pins_CREALITY_V4.h

@@ -173,14 +173,14 @@
    *   GND | 9 10 | 5V
    *        ------
    */
-  #define EXP3_01_PIN                     PC6
-  #define EXP3_02_PIN                     PB2
-  #define EXP3_03_PIN                     PB10
-  #define EXP3_04_PIN                     PB11
-  #define EXP3_05_PIN                     PB14
-  #define EXP3_06_PIN                     PB13
-  #define EXP3_07_PIN                     PB12
-  #define EXP3_08_PIN                     PB15
+  #define EXP3_01_PIN                       PC6
+  #define EXP3_02_PIN                       PB2
+  #define EXP3_03_PIN                       PB10
+  #define EXP3_04_PIN                       PB11
+  #define EXP3_05_PIN                       PB14
+  #define EXP3_06_PIN                       PB13
+  #define EXP3_07_PIN                       PB12
+  #define EXP3_08_PIN                       PB15
 
 #elif EITHER(VET6_12864_LCD, DWIN_VET6_CREALITY_LCD)
 
@@ -194,14 +194,14 @@
    *   GND | 9 10 | 5V
    *        ------
    */
-  #define EXP3_01_PIN                     -1
-  #define EXP3_02_PIN                     PC5
-  #define EXP3_03_PIN                     PB10
-  #define EXP3_04_PIN                     -1
-  #define EXP3_05_PIN                     PA6
-  #define EXP3_06_PIN                     PA5
-  #define EXP3_07_PIN                     PA4
-  #define EXP3_08_PIN                     PA7
+  #define EXP3_01_PIN                       -1
+  #define EXP3_02_PIN                       PC5
+  #define EXP3_03_PIN                       PB10
+  #define EXP3_04_PIN                       -1
+  #define EXP3_05_PIN                       PA6
+  #define EXP3_06_PIN                       PA5
+  #define EXP3_07_PIN                       PA4
+  #define EXP3_08_PIN                       PA7
 
 #elif EITHER(CR10_STOCKDISPLAY, FYSETC_MINI_12864_2_1)
   #error "Define RET6_12864_LCD or VET6_12864_LCD to select pins for the LCD with the Creality V4 controller."
@@ -283,3 +283,26 @@
   #define NEOPIXEL_PIN                      PA13
 
 #endif
+
+// Pins for documentation and sanity checks only.
+// Changing these will not change the pin they are on.
+
+// Hardware UART pins
+#define UART1_TX_PIN                        PA9   // default uses CH340 RX
+#define UART1_RX_PIN                        PA10  // default uses CH340 TX
+#define UART2_TX_PIN                        PA2   // default uses HEATER_BED_PIN
+#define UART2_RX_PIN                        PA3   // not connected
+#define UART3_TX_PIN                        PB10  // default uses LCD connector
+#define UART3_RX_PIN                        PB11  // default uses LCD connector
+#define UART4_TX_PIN                        PC10  // default uses sdcard SDIO_D2
+#define UART4_RX_PIN                        PC11  // default uses sdcard SDIO_D3
+#define UART5_TX_PIN                        PC12  // default uses sdcard SDIO_CK
+#define UART5_RX_PIN                        PD2   // default uses sdcard SDIO_CMD
+
+// SDIO pins
+#define SDIO_D0_PIN                         PC8
+#define SDIO_D1_PIN                         PC9
+#define SDIO_D2_PIN                         PC10
+#define SDIO_D3_PIN                         PC11
+#define SDIO_CK_PIN                         PC12
+#define SDIO_CMD_PIN                        PD2