Changed the chainloader to load payloads named "BUTTON_NAME.bin", to remember which payload is which. Original idea and code by @habbbe (many thanks!)

source/fatfs/ffconf.h

@@ -34,7 +34,7 @@
 /  2: Enable with LF-CRLF conversion. */
 
 
-#define _USE_FIND		0
+#define _USE_FIND		1
 /* This option switches filtered directory read feature and related functions,
 /  f_findfirst() and f_findnext(). (0:Disable or 1:Enable) */
 

source/fs.c

@@ -64,16 +64,16 @@ u32 fileSize(const char *path)
     return size;
 }
 
-u32 fileExists(const char *path)
+u32 defPayloadExists(void)
 {
-    FIL fp;
-    u32 exists = 0;
+    DIR dir;
+    FILINFO info = { .lfname = NULL };
 
-    if(f_open(&fp, path, FA_READ) == FR_OK) exists = 1;
+    FRESULT result = f_findfirst(&dir, &info, "/aurei/payloads", "def_*.bin");
 
-    f_close(&fp);
+    f_closedir(&dir);
 
-    return exists;
+    return (result == FR_OK && info.fname[0]);
 }
 
 void firmRead(void *dest, const char *firmFolder)

source/fs.h

@@ -12,5 +12,5 @@ u32 mountFs(void);
 u32 fileRead(void *dest, const char *path, u32 size);
 u32 fileWrite(const void *buffer, const char *path, u32 size);
 u32 fileSize(const char *path);
-u32 fileExists(const char *path);
+u32 defPayloadExists(void);
 void firmRead(void *dest, const char *firmFolder);

source/loader.c

@@ -14,7 +14,7 @@
 
 void loadPayload(void)
 {
-    if(fileExists("aurei/payloads/default.bin"))
+    if(defPayloadExists())
     {
         initScreens();
         memcpy((void *)PAYLOAD_ADDRESS, loader, loader_size);