backup codes

2025-12-19 22:25:54 +08:00
parent 8f711a4a2d
commit 397033e293
6 changed files with 1008 additions and 9 deletions
--- a/bsp/boot0.c
+++ b/bsp/boot0.c
@@ -0,0 +1,28 @@
+#include <bootloader.h>
+
+#ifdef ENABLE_OPTION_BOOTLOADER
+void bootloader_enter(void) __trap __naked {
+    /* Exec after reset  */
+__asm
+    ldw Y, SP           ; [90 96] 
+    ldw X, #0x483F      ; [AE 48 3F]
+    _cycle:
+        decw X          ; [5A]
+        push A          ; [88]
+        ld A, (X)       ; [F6]
+        jrne _cycle     ; [26 FB]
+        // check address
+        ldw X, SP       ; [96]
+        addw X, #3      ; [1C 00 03]
+        cpw X, (1,SP)   ; [13 01]
+        jrne _exit      ; [26 01]
+        // save SP to 0x0000
+        ldw 0x0000, Y
+        // jump to ram
+        ret             ; [81]
+    _exit:
+        ldw SP,Y        ; [90 94]
+        jp 0x8004       ; [cc 80 04]
+__endasm;
+}
+#endif /* ENABLE_OPTION_BOOTLOADER */