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Diffstat (limited to 'contrib/loaders/flash/stm32x.s')
| -rw-r--r-- | contrib/loaders/flash/stm32x.s | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/contrib/loaders/flash/stm32x.s b/contrib/loaders/flash/stm32x.s new file mode 100644 index 00000000..dcf2b83c --- /dev/null +++ b/contrib/loaders/flash/stm32x.s @@ -0,0 +1,52 @@ +/*************************************************************************** + * Copyright (C) 2010 by Spencer Oliver * + * spen@spen-soft.co.uk * + * * + * 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., * + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * + ***************************************************************************/ + + .text + .arm + +/* + r0 - source address + r1 - target address + r2 - count (halfword-16bit) + r3 - result + r4 - temp + r5 - temp +*/ + +write: + ldr r4, STM32_FLASH_CR + ldr r5, STM32_FLASH_SR + mov r3, #1 + str r3, [r4, #0] + ldrh r3, [r0], #2 + strh r3, [r1], #2 +busy: + ldr r3, [r5, #0] + tst r3, #0x01 + beq busy + tst r3, #0x14 + bne exit + subs r2, r2, #1 + bne write +exit: + bkpt #0 + +STM32_FLASH_CR: .word 0x40022010 +STM32_FLASH_SR: .word 0x4002200C |