diff options
Diffstat (limited to 'contrib/loaders/flash/stm32/stm32f2x.S')
| -rw-r--r-- | contrib/loaders/flash/stm32/stm32f2x.S | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/contrib/loaders/flash/stm32/stm32f2x.S b/contrib/loaders/flash/stm32/stm32f2x.S new file mode 100644 index 0000000..f6f5b30 --- /dev/null +++ b/contrib/loaders/flash/stm32/stm32f2x.S @@ -0,0 +1,85 @@ +/*************************************************************************** + * Copyright (C) 2010 by Spencer Oliver * + * spen@spen-soft.co.uk * + * * + * Copyright (C) 2011 Øyvind Harboe * + * oyvind.harboe@zylin.com * + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + * This program is distributed in the hope that it will be useful, * + * but WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * + * GNU General Public License for more details. * + * * + * You should have received a copy of the GNU General Public License * + * along with this program; if not, write to the * + * Free Software Foundation, Inc., * + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * + ***************************************************************************/ + + .text + .syntax unified + .cpu cortex-m3 + .thumb + +/* + * Params : + * r0 = workarea start, status (out) + * r1 = workarea end + * r2 = target address + * r3 = count (16bit words) + * r4 = flash base + * + * Clobbered: + * r6 - temp + * r7 - rp + * r8 - wp, tmp + */ + +#define STM32_FLASH_CR_OFFSET 0x10 /* offset of CR register in FLASH struct */ +#define STM32_FLASH_SR_OFFSET 0x0c /* offset of SR register in FLASH struct */ + +#define STM32_PROG16 0x101 /* PG | PSIZE_16*/ + + .thumb_func + .global _start +_start: +wait_fifo: + ldr r8, [r0, #0] /* read wp */ + cmp r8, #0 /* abort if wp == 0 */ + beq exit + ldr r7, [r0, #4] /* read rp */ + cmp r7, r8 /* wait until rp != wp */ + beq wait_fifo + + ldr r6, =STM32_PROG16 + str r6, [r4, #STM32_FLASH_CR_OFFSET] + ldrh r6, [r7], #0x02 /* read one half-word from src, increment ptr */ + strh r6, [r2], #0x02 /* write one half-word from src, increment ptr */ + dsb +busy: + ldr r6, [r4, #STM32_FLASH_SR_OFFSET] + tst r6, #0x10000 /* BSY (bit16) == 1 => operation in progress */ + bne busy /* wait more... */ + tst r6, #0xf0 /* PGSERR | PGPERR | PGAERR | WRPERR */ + bne error /* fail... */ + + cmp r7, r1 /* wrap rp at end of buffer */ + it cs + addcs r7, r0, #8 /* skip loader args */ + str r7, [r0, #4] /* store rp */ + subs r3, r3, #1 /* decrement halfword count */ + cbz r3, exit /* loop if not done */ + b wait_fifo +error: + movs r1, #0 + str r1, [r0, #4] /* set rp = 0 on error */ +exit: + mov r0, r6 /* return status in r0 */ + bkpt #0x00 + + .pool |