add uf2 actual application size

src/usb/uf2/ghostfat.c

@@ -4,7 +4,10 @@
 #include <string.h>
 #include "tusb.h"
 
-#if 1
+// to determine application size
+#include "bootloader_settings.h"
+#include "bootloader.h"
+
 typedef struct {
     uint8_t JumpInstruction[3];
     uint8_t OEMInfo[8];
@@ -78,7 +81,7 @@ static const struct TextFile info[] = {
 };
 #define NUM_INFO (sizeof(info) / sizeof(info[0]))
 
-#define UF2_SIZE (FLASH_SIZE * 2)
+#define UF2_SIZE           (get_flash_size() * 2)
 #define UF2_SECTORS        (UF2_SIZE / 512)
 #define UF2_FIRST_SECTOR   (NUM_INFO + 1)
 #define UF2_LAST_SECTOR    (UF2_FIRST_SECTOR + UF2_SECTORS - 1)
@@ -120,6 +123,18 @@ uint8_t flashBuf[FLASH_PAGE_SIZE] __attribute__((aligned(4)));
 bool firstFlush = true;
 bool hadWrite = false;
 
+
+static uint32_t get_flash_size(void)
+{
+  // return 1 block of 256 bytes
+  if ( !bootloader_app_is_valid(DFU_BANK_0_REGION_START) ) return 256;
+
+  const bootloader_settings_t * boot_setting;
+  bootloader_util_settings_get(&boot_setting);
+
+  return boot_setting->bank_0_size;
+}
+
 #if 0
 void flushFlash() {
     if (flashAddr == NO_CACHE)
@@ -322,5 +337,3 @@ void write_block(uint32_t block_no, uint8_t *data, bool quiet, WriteState *state
     }
 }
 #endif
-
-#endif