stm32/main: Remove need for first_soft_reset variable.

ports/stm32/main.c

@@ -263,7 +263,7 @@ MP_NOINLINE STATIC bool init_flash_fs(uint reset_mode) {
 }
 
 #if MICROPY_HW_HAS_SDCARD
-STATIC bool init_sdcard_fs(bool first_soft_reset) {
+STATIC bool init_sdcard_fs(void) {
     bool first_part = true;
     for (int part_num = 1; part_num <= 4; ++part_num) {
         // create vfs object
@@ -308,12 +308,12 @@ STATIC bool init_sdcard_fs(bool first_soft_reset) {
                 }
             }
 
-            if (first_soft_reset) {
-                // use SD card as medium for the USB MSD
-                #if defined(USE_DEVICE_MODE)
+            #if defined(USE_DEVICE_MODE)
+            if (pyb_usb_storage_medium == PYB_USB_STORAGE_MEDIUM_NONE) {
+                // if no USB MSC medium is selected then use the SD card
                 pyb_usb_storage_medium = PYB_USB_STORAGE_MEDIUM_SDCARD;
-                #endif
             }
+            #endif
 
             #if defined(USE_DEVICE_MODE)
             // only use SD card as current directory if that's what the USB medium is
@@ -470,13 +470,6 @@ int main(void) {
     #endif
     storage_init();
 
-#if defined(USE_DEVICE_MODE)
-    // default to internal flash being the usb medium
-    pyb_usb_storage_medium = PYB_USB_STORAGE_MEDIUM_FLASH;
-#endif
-
-    int first_soft_reset = true;
-
 soft_reset:
 
     // check if user switch held to select the reset mode
@@ -558,11 +551,18 @@ soft_reset:
     if (sdcard_is_present()) {
         // if there is a file in the flash called "SKIPSD", then we don't mount the SD card
         if (!mounted_flash || f_stat(&fs_user_mount_flash.fatfs, "/SKIPSD", NULL) != FR_OK) {
-            mounted_sdcard = init_sdcard_fs(first_soft_reset);
+            mounted_sdcard = init_sdcard_fs();
         }
     }
 #endif
 
+    #if defined(USE_DEVICE_MODE)
+    // if the SD card isn't used as the USB MSC medium then use the internal flash
+    if (pyb_usb_storage_medium == PYB_USB_STORAGE_MEDIUM_NONE) {
+        pyb_usb_storage_medium = PYB_USB_STORAGE_MEDIUM_FLASH;
+    }
+    #endif
+
     // set sys.path based on mounted filesystems (/sd is first so it can override /flash)
     if (mounted_sdcard) {
         mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_sd));
@@ -688,6 +688,5 @@ soft_reset_exit:
     pyb_thread_deinit();
     #endif
 
-    first_soft_reset = false;
     goto soft_reset;
 }