HI all,
I try my best to get the asm file work with the M0. I have modified the
stm32f2x.S becaus eit look simpler than the on from the stm32f1x.S
Here how it's look.
// Build : arm-eabi-gcc -c stm32f2xxx.S
.text
.syntax unified
.cpu cortex-m0
.thumb
.thumb_func
.global write
/*
r0 - source address
r1 - target address
r2 - count (halfword-16bit)
r3 - result out
r4 - flash base
*/
#define STM32_FLASH_CR_OFFSET 0x10 /* offset of CR
register in FLASH struct */
#define STM32_FLASH_SR_OFFSET 0x0c /* offset of CR
register in FLASH struct */
write:
write_half_word:
ldr r3, STM32_PG
str r3, [r4, #STM32_FLASH_CR_OFFSET]
ldrh r3, [r0]
/* read one half-word from src */
strh r3, [r1]
/* write one half-word from src*/
adds r0, r0, #2
/* increment ptr */
adds r1, r1, #2
/* increment ptr */
busy:
ldrb r3, [r4, #STM32_FLASH_SR_OFFSET]
cmp r3, #0x1
/* BSY (bit0) == 1 => operation in progress */
beq busy
/* wait more... */
cmp r3, #0x24
/* PGPERR | WRPERR */
beq exit
/* fail... */
subs r2, r2, #0x01 /*
decrement counter */
bne write_half_word
/* write next half-word if anything left */
exit:
bkpt #0x00
STM32_PG: .word 0x001 /*
PG */
Is it possible to have a small review on this. I'm really poor in assembly
language !
Regards
Jonathan
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