Merge pull request #171 from erwinschrodinger1/master

feat(fat_format): add fat file format on kconfig to change MKFS_PARM format options (IEC-294)

Author: tore-espressif

device/esp_tinyusb/Kconfig

@@ -185,6 +185,36 @@ menu "TinyUSB Stack"
             default "/data"
             help
                 MSC Mount Path of storage.
+
+        menu "TinyUSB FAT Format Options"
+            choice TINYUSB_FAT_FORMAT_TYPE
+               prompt "FatFS Format Type"
+                default TINYUSB_FAT_FORMAT_ANY
+                help
+                    Select the FAT filesystem type used when formatting storage.
+
+            config TINYUSB_FAT_FORMAT_ANY
+                bool "FM_ANY - Automatically select from FAT12/FAT16/FAT32"
+
+            config TINYUSB_FAT_FORMAT_FAT
+                bool "FM_FAT - Allow only FAT12/FAT16"
+
+            config TINYUSB_FAT_FORMAT_FAT32
+                bool "FM_FAT32 - Force FAT32 only"
+
+            config TINYUSB_FAT_FORMAT_EXFAT
+                bool "FM_EXFAT - Force exFAT (requires exFAT enabled)"
+
+            endchoice
+
+            config TINYUSB_FAT_FORMAT_SFD
+                bool "FM_SFD - Use SFD (no partition table)"
+                default n
+                help
+                    Format as a Super Floppy Disk (no partition table).
+                    This is typical for USB flash drives and small volumes.
+            endmenu
+
     endmenu # "Massive Storage Class"
 
     menu "Communication Device Class (CDC)"

device/esp_tinyusb/tusb_msc_storage.c

@@ -253,7 +253,29 @@ static esp_err_t _mount(char *drv, FATFS *fs)
                                      CONFIG_WL_SECTOR_SIZE,
                                      4096);
         ESP_LOGW(TAG, "formatting card, allocation unit size=%d", alloc_unit_size);
-        const MKFS_PARM opt = {(BYTE)FM_FAT, 0, 0, 0, alloc_unit_size};
+
+        BYTE format_flags;
+#if defined(CONFIG_TINYUSB_FAT_FORMAT_ANY)
+        format_flags = FM_ANY;
+
+#elif defined(CONFIG_TINYUSB_FAT_FORMAT_FAT)
+        format_flags = FM_FAT;
+
+#elif defined(CONFIG_TINYUSB_FAT_FORMAT_FAT32)
+        format_flags = FM_FAT32;
+
+#elif defined(CONFIG_TINYUSB_FAT_FORMAT_EXFAT)
+        format_flags = FM_EXFAT;
+#else
+
+#error "No FAT format type selected"
+
+#endif
+
+#ifdef CONFIG_TINYUSB_FAT_FORMAT_SFD
+        format_flags |= FM_SFD;
+#endif
+        const MKFS_PARM opt = {format_flags, 0, 0, 0, alloc_unit_size};
         fresult = f_mkfs("", &opt, workbuf, workbuf_size); // Use default volume
         if (fresult != FR_OK) {
             ret = ESP_FAIL;