extend uart checks

Author: ellensp

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

@@ -58,8 +58,9 @@
  * Check for common serial pin conflicts
  */
 #define _CHECK_SERIAL_PIN(N) (( \
-    BTN_EN1 == N || DOGLCD_CS == N || HEATER_BED_PIN == N || FAN0_PIN == N || \
-    SDIO_D2_PIN == N || SDIO_D3_PIN == N || SDIO_CK_PIN == N || SDIO_CMD_PIN == N \
+    BTN_EN1 == N || BTN_EN2 == N ||DOGLCD_CS == N || HEATER_BED_PIN == N || FAN0_PIN == N || \
+    SDIO_D2_PIN == N || SDIO_D3_PIN == N || SDIO_CK_PIN == N || SDIO_CMD_PIN == N || \
+    Y_STEP_PIN == N || Y_ENABLE_PIN == N || E0_ENABLE_PIN == N || POWER_LOSS_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)

Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_V2_0.h

@@ -107,3 +107,18 @@
     #define E0_SLAVE_ADDRESS 3
   #endif
 #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 usage LCD connector
+#define UART1_RX_PIN                        PA10  // default usage LCD connector
+#define UART2_TX_PIN                        PA2   // default usage TFT connector
+#define UART2_RX_PIN                        PA3   // default usage TFT connector
+#define UART3_TX_PIN                        PB10  // default usage Y_STEP_PIN
+#define UART3_RX_PIN                        PB11  // default usage Y_ENABLE_PIN
+#define UART4_TX_PIN                        PC10  // default usage TMC UART
+#define UART4_RX_PIN                        PC11  // default usage TMC UART
+#define UART5_TX_PIN                        PC12  // default usage POWER_LOSS_PIN
+#define UART5_RX_PIN                        PD2   // default usage E0_ENABLE_PIN

Marlin/src/pins/stm32g0/pins_BTT_SKR_MINI_E3_V3_0.h

@@ -461,3 +461,14 @@
 #ifndef BOARD_NEOPIXEL_PIN
   #define BOARD_NEOPIXEL_PIN                PA8   // LED driving pin
 #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 usage LCD connector
+#define UART1_RX_PIN                        PA10  // default usage LCD connector
+#define UART2_TX_PIN                        PA2   // default usage TFT connector
+#define UART2_RX_PIN                        PA3   // default usage TFT connector
+#define UART4_TX_PIN                        PC10  // default usage TMC UART
+#define UART4_RX_PIN                        PC11  // default usage TMC UART