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authorGareth McMullin2012-02-08 20:43:12 +1300
committerGareth McMullin2012-02-08 20:43:12 +1300
commit4282244fb4ddee37d1e8dd7c29947cf3e4e23dcf (patch)
tree43af759d0d831d7ae6830233319d51e2a98fddc4 /flashstub
parentb52c62266a5eecf6b98024054f3b1ae39da28755 (diff)
stm32f4: Fixed chunk padding for flash programming.
Diffstat (limited to 'flashstub')
-rw-r--r--flashstub/stm32f4.s44
1 files changed, 44 insertions, 0 deletions
diff --git a/flashstub/stm32f4.s b/flashstub/stm32f4.s
new file mode 100644
index 0000000..fa3fda0
--- /dev/null
+++ b/flashstub/stm32f4.s
@@ -0,0 +1,44 @@
+.global _start
+
+_start:
+ ldr r0, _flashbase
+ ldr r1, _addr
+ mov r2, pc
+ add r2, #(_data - . - 2)
+ ldr r3, _size
+ ldr r5, _cr
+_next:
+ cbz r3, _done
+ @ Write PG command to FLASH_CR
+ str r5, [r0, #0x10]
+ @ Write data to flash (word)
+ ldr r4, [r2]
+ str r4, [r1]
+
+_wait: @ Wait for BSY bit to clear
+ ldrh r4, [r0, #0x0E]
+ mov r6, #1
+ tst r4, r6
+ bne _wait
+
+ sub r3, #4
+ add r1, #4
+ add r2, #4
+ b _next
+_done:
+ bkpt
+
+@.align 4
+.org 0x28
+_cr:
+ .word 0x00000201
+_flashbase:
+ .word 0x40023C00
+_addr:
+ .word 0x0800bf78
+_size:
+ .word 8
+_data:
+ .word 0xAAAAAAAA
+ .word 0xBBBBBBBB
+ .word 0xCCCCCCCC