stm32f4.s

.global start
.syntax unified

@ r0 = source
@ r1 = target
@ r2 = wordcount
@ r3 = flash_base
@ r4 = temp

start:
	ldr r3, flash_base
next:
	cbz r2, done
	ldr r4, [r0]
	str r4, [r1]

wait:
	ldrh r4, [r3, #0x0e]
	tst.w r4, #1
	bne wait
	
	add r0, #4
	add r1, #4
	sub r2, #1
	b next
done:
	bkpt

.align 2

flash_base:
	.word 0x40023c00