1 /***************************************************************************
2 * Copyright (C) 2010 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
30 r2 - count (halfword-16bit)
35 #define STM32_FLASH_CR_OFFSET 0x10 /* offset of CR register in FLASH struct */
36 #define STM32_FLASH_SR_OFFSET 0x0c /* offset of CR register in FLASH struct */
39 ldr
r4, STM32_FLASH_BASE
42 str
r3, [r4, #STM32_FLASH_CR_OFFSET] /* PG (bit0) == 1 => flash programming enabled */
43 ldrh
r3, [r0], #0x02 /* read one half-word from src, increment ptr */
44 strh
r3, [r1], #0x02 /* write one half-word from src, increment ptr */
46 ldr
r3, [r4, #STM32_FLASH_SR_OFFSET]
47 tst
r3, #0x01 /* BSY (bit0) == 1 => operation in progress */
48 beq busy
/* wait more... */
49 tst
r3, #0x14 /* PGERR (bit2) == 1 or WRPRTERR (bit4) == 1 => error */
50 bne exit
/* fail... */
51 subs
r2, r2, #0x01 /* decrement counter */
52 bne write_half_word
/* write next half-word if anything left */
56 STM32_FLASH_BASE
: .word 0x40022000 /* base address of FLASH struct */