Fixes for FYSETC Cheetah (#17935)

Marlin/Configuration_adv.h

   //#define AO_EXP2_PINMAP      // AlephObjects CLCD UI EXP2 mapping
   //#define CR10_TFT_PINMAP     // Rudolph Riedel's CR10 pin mapping
   //#define S6_TFT_PINMAP       // FYSETC S6 pin mapping
-  //#define CHEETAH_TFT_PINMAP  // FYSETC Cheetah pin mapping
   //#define E3_EXP1_PINMAP      // E3 type boards (SKR E3/DIP, and Stock boards) EXP1 pin mapping
   //#define GENERIC_EXP2_PINMAP // GENERIC EXP2 pin mapping
 

Marlin/src/lcd/extui/lib/ftdi_eve_touch_ui/pin_mappings.h

   #define CLCD_MOD_RESET                 BTN_EN1
   #define CLCD_SPI_CS                    LCD_PINS_RS
 #endif
-
-#ifdef CHEETAH_TFT_PINMAP
-  #ifndef __MARLIN_FIRMWARE__
-    #error "This pin mapping requires Marlin."
-  #endif
-
-  #define CLCD_MOD_RESET                 BTN_EN1
-  #define CLCD_SPI_CS                    LCD_PINS_RS
-
-  #if ENABLED(CLCD_USE_SOFT_SPI)
-    #define CLCD_SOFT_SPI_MOSI           LCD_PINS_ENABLE
-    #define CLCD_SOFT_SPI_MISO           LCD_PINS_SCK
-    #define CLCD_SOFT_SPI_SCLK           LCD_PINS_D4
-  #endif
-#endif

Marlin/src/pins/stm32f1/pins_FYSETC_CHEETAH.h

 
 #define BOARD_INFO_NAME   "FYSETC Cheetah"
 #define BOARD_WEBSITE_URL "fysetc.com"
+// https://github.com/FYSETC/Cheetah
 
 // Ignore temp readings during development.
 //#define BOGUS_TEMPERATURE_GRACE_PERIOD 2000
 // Misc. Functions
 //
 #define SDSS                                PA4
+#define SD_DETECT_PIN                       PC3
 
-//
-// LCD Pins
-//
-/**
- *                 _____
- *             5V | 1 2 | GND
- *    (MOSI) PB15 | 3 4 | PB12 (LCD_EN)
- *     (SCK) PB13 | 5 6   PC11 (BTN_EN1)
- *  (LCD_RS) PB14 | 7 8 | PC10 (BTN_EN2)
- * (BTN_ENC) PC12 | 9 10| PC9  (BEEPER)
- *                 -----
- *                 EXP1
- */
+#ifndef RGB_LED_R_PIN
+  #define RGB_LED_R_PIN                     PB0
+#endif
+#ifndef RGB_LED_G_PIN
+  #define RGB_LED_G_PIN                     PB7
+#endif
+#ifndef RGB_LED_B_PIN
+  #define RGB_LED_B_PIN                     PB6
+#endif
 
-#define EXPA1_03_PIN                        PB15
-#define EXPA1_04_PIN                        PB12
-#define EXPA1_05_PIN                        PB13
-#define EXPA1_06_PIN                        PC11
-#define EXPA1_07_PIN                        PB14
-#define EXPA1_08_PIN                        PC10
-#define EXPA1_09_PIN                        PC12
-#define EXPA1_10_PIN                        PC9
+/*
+* EXP1 pinout for the LCD according to Fysetcs schematic for the Cheetah board
+*                 _____
+*  (Beeper) PC9  | 1 2 | PC12 (BTN_ENC)
+* (BTN_EN2) PC11 | 3 4 | PB14 (LCD_RS / MISO)
+* (BTN_EN1) PC10   5 6 | PB13 (SCK)
+*  (LCD_EN) PB12 | 7 8 | PB15 (MOSI)
+*            GND | 9 10| 5V
+*                 -----
+*                 EXP1
+* Note: The pin-numbers match the connector correctly and are not in reverse order like on the Ender-3 board.
+* Note: Functionally the pins are assigned in the same order as on the Ender-3 board.
+* Note: Pin 4 on the Cheetah board is assigned to an I/O, it is assigned to RESET on the Ender-3 board.
+*/
 
 #if HAS_SPI_LCD
-
-  #define BEEPER_PIN                EXPA1_10_PIN
+  #define BEEPER_PIN                        PC9
 
   #if HAS_GRAPHICAL_LCD
-    #define DOGLCD_A0               EXPA1_07_PIN
-    #define DOGLCD_CS               EXPA1_04_PIN
-    #define DOGLCD_SCK              EXPA1_05_PIN
-    #define DOGLCD_MOSI             EXPA1_03_PIN
+    #define DOGLCD_A0                       PB14
+    #define DOGLCD_CS                       PB12
+    #define DOGLCD_SCK                      PB13
+    #define DOGLCD_MOSI                     PB15
     //#define LCD_SCREEN_ROT_90
     //#define LCD_SCREEN_ROT_180
     //#define LCD_SCREEN_ROT_270
     #endif
   #endif
 
-  #define LCD_PINS_RS               EXPA1_04_PIN  // CS -- SOFT SPI for ENDER3 LCD
-  #define LCD_PINS_D4               EXPA1_05_PIN  // SCLK
-  #define LCD_PINS_ENABLE           EXPA1_03_PIN  // DATA MOSI
-
-  // not connected to a pin
-  #define SD_DETECT_PIN                     PC3
-
-  #ifndef RGB_LED_R_PIN
-    #define RGB_LED_R_PIN                   PB0
-  #endif
-  #ifndef RGB_LED_G_PIN
-    #define RGB_LED_G_PIN                   PB7
-  #endif
-  #ifndef RGB_LED_B_PIN
-    #define RGB_LED_B_PIN                   PB6
-  #endif
+  #define LCD_PINS_RS                       PB12  // CS -- SOFT SPI for ENDER3 LCD
+  #define LCD_PINS_D4                       PB13  // SCLK
+  #define LCD_PINS_ENABLE                   PB15  // DATA MOSI
 
   //#define LCD_CONTRAST_INIT 190
 
   #if ENABLED(NEWPANEL)
-    #define BTN_EN1                 EXPA1_06_PIN
-    #define BTN_EN2                 EXPA1_08_PIN
-    #define BTN_ENC                 EXPA1_09_PIN
+    #define BTN_EN1                         PC10
+    #define BTN_EN2                         PC11
+    #define BTN_ENC                         PC12
   #endif
-
 #endif
 
 #if ENABLED(TOUCH_UI_FTDI_EVE)
-  #define BEEPER_PIN                EXPA1_10_PIN
-
-  #define BTN_EN1                   EXPA1_06_PIN
+  #define BEEPER_PIN                        PC9
+  #define CLCD_MOD_RESET                    PC11
+  #define CLCD_SPI_CS                       PB12
 
-  #define LCD_PINS_RS               EXPA1_04_PIN
+  //#define CLCD_USE_SOFT_SPI                     // the Cheetah can use hardware-SPI so we do not really need this
 
-  #define CLCD_SPI_BUS 2
-  //#define CLCD_USE_SOFT_SPI
   #if ENABLED(CLCD_USE_SOFT_SPI)
-    #define LCD_PINS_ENABLE         EXPA1_03_PIN
-    #define LCD_PINS_SCK            EXPA1_07_PIN
-    #define LCD_PINS_D4             EXPA1_05_PIN
+    #define CLCD_SOFT_SPI_MOSI              PB15
+    #define CLCD_SOFT_SPI_MISO              PB14
+    #define CLCD_SOFT_SPI_SCLK              PB13
+  #else
+    #define CLCD_SPI_BUS 2
   #endif
 #endif