Fysetc S6 pins / LCD updates (#16830)

Marlin/src/lcd/extensible_ui/lib/ftdi_eve_touch_ui/compat.h

@@ -37,6 +37,10 @@
 #ifdef __MARLIN_FIRMWARE__
   // __MARLIN_FIRMWARE__ exists when compiled within Marlin.
   #include "pin_mappings.h"
+  #undef max
+  #define max(a,b) ((a)>(b)?(a):(b))
+  #undef min
+  #define min(a,b) ((a)<(b)?(a):(b))
 #else
   namespace UI {
     static inline uint32_t safe_millis() {return millis();};

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

@@ -27,6 +27,15 @@
  * without adding new pin definitions to the board.
  */
 
+#ifdef S6_TFT_PINMAP
+  #ifndef __MARLIN_FIRMWARE__
+    #error "This pin mapping requires Marlin."
+  #endif
+
+  #define CLCD_SPI_CS         PC7
+  #define CLCD_MOD_RESET      PC6
+#endif
+
 #ifdef CR10_TFT_PINMAP
   #ifndef __MARLIN_FIRMWARE__
     #error "This pin mapping requires Marlin."