STM32 Shared Media - USB Mass Storage Device (#20956)

Marlin/src/HAL/STM32/HAL.cpp

@@ -42,6 +42,11 @@
   #endif
 #endif
 
+#if HAS_SD_HOST_DRIVE
+  #include "msc_sd.h"
+  #include "usbd_cdc_if.h"
+#endif
+
 // ------------------------
 // Public Variables
 // ------------------------
@@ -88,6 +93,19 @@ void HAL_init() {
   #if ENABLED(EMERGENCY_PARSER) && USBD_USE_CDC
     USB_Hook_init();
   #endif
+
+  #if HAS_SD_HOST_DRIVE
+    MSC_SD_init();                         // Enable USB SD card access
+  #endif
+}
+
+// HAL idle task
+void HAL_idletask() {
+  #if HAS_SHARED_MEDIA
+    // Stm32duino currently doesn't have a "loop/idle" method
+    CDC_resume_receive();
+    CDC_continue_transmit();
+  #endif
 }
 
 void HAL_clear_reset_source() { __HAL_RCC_CLEAR_RESET_FLAGS(); }