STM32F1 USB cdc/msc composite device (#15180)

Co-Authored-By: bigtreetech <38851044+bigtreetech@users.noreply.github.com>

Marlin/src/pins/stm32/pins_BIGTREE_SKR_E3_DIP.h

@@ -187,3 +187,15 @@
   #endif
 
 #endif // HAS_SPI_LCD
+
+//
+// SD Support
+//
+#define HAS_ONBOARD_SD
+
+#ifndef SDCARD_CONNECTION
+  #define SDCARD_CONNECTION ONBOARD
+#endif
+
+#define ON_BOARD_SPI_DEVICE 1    //SPI1
+#define ONBOARD_SD_CS_PIN  PA4   // Chip select for "System" SD card

Marlin/src/pins/stm32/pins_BIGTREE_SKR_MINI_E3.h

@@ -142,3 +142,15 @@
   #endif
 
 #endif // HAS_SPI_LCD
+
+//
+// SD Support
+//
+#define HAS_ONBOARD_SD
+
+#ifndef SDCARD_CONNECTION
+  #define SDCARD_CONNECTION ONBOARD
+#endif
+
+#define ON_BOARD_SPI_DEVICE 1    //SPI1
+#define ONBOARD_SD_CS_PIN  PA4   // Chip select for "System" SD card

Marlin/src/pins/stm32/pins_BIGTREE_SKR_MINI_V1_1.h

@@ -160,20 +160,20 @@
 //
 
 // By default the onboard SD is enabled.
-// To disable it and use an external SD (connected to LCD)
-// enable STM32_SD_LCD.
+// set SDCARD_CONNECTION form 'ONBOARD' to 'LCD' and use an external SD (connected to LCD)
+#define HAS_ONBOARD_SD
+#ifndef SDCARD_CONNECTION
+  #define SDCARD_CONNECTION ONBOARD
+#endif
 
-//#define STM32_SD_LCD
-
-#if ENABLED(STM32_SD_LCD)
+#if SD_CONNECTION_IS(LCD)
   #define ENABLE_SPI3
   #define SD_DETECT_PIN    PB9
   #define SCK_PIN          PB3
   #define MISO_PIN         PB4
   #define MOSI_PIN         PB5
   #define SS_PIN           PA15
-#else
-  #define SDCARD_CONNECTION ONBOARD
+#if SD_CONNECTION_IS(ONBOARD)
   #define ENABLE_SPI1
   #define SD_DETECT_PIN    PA3
   #define SCK_PIN          PA5
@@ -181,6 +181,8 @@
   #define MOSI_PIN         PA7
   #define SS_PIN           PA4
 #endif
+#define ON_BOARD_SPI_DEVICE 1    //SPI1
+#define ONBOARD_SD_CS_PIN  PA4   // Chip select for "System" SD card
 
 #ifndef ST7920_DELAY_1
   #define ST7920_DELAY_1 DELAY_NS(125)