contrib/loaders/flash/stm32x.s

   1 /***************************************************************************
   2  *   Copyright (C) 2010 by Spencer Oliver                                  *
   3  *   spen@spen-soft.co.uk                                                  *
   4  *                                                                         *
   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.                                   *
   9  *                                                                         *
  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.                          *
  14  *                                                                         *
  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  ***************************************************************************/
  20
  21         .text
  22         .arm
  23
  24 /*
  25         r0 - source address
  26         r1 - target address
  27         r2 - count (halfword-16bit)
  28         r3 - result
  29         r4 - temp
  30         r5 - temp
  31 */
  32
  33 write:
  34         ldr             r4, STM32_FLASH_CR
  35         ldr             r5, STM32_FLASH_SR
  36         mov             r3, #1
  37         str             r3, [r4, #0]
  38         ldrh    r3, [r0], #2
  39         strh    r3, [r1], #2
  40 busy:
  41         ldr     r3, [r5, #0]
  42         tst     r3, #0x01
  43         beq     busy
  44         tst             r3, #0x14
  45         bne             exit
  46         subs    r2, r2, #1
  47         bne             write
  48 exit:
  49         bkpt    #0
  50
  51 STM32_FLASH_CR: .word 0x40022010
  52 STM32_FLASH_SR: .word 0x4002200C