contrib/loaders/flash/stm32lx.S

   1 /***************************************************************************
   2  *   Copyright (C) 2010 by Spencer Oliver                                  *
   3  *   spen@spen-soft.co.uk                                                  *
   4  *                                                                         *
   5  *   Copyright (C) 2011 Øyvind Harboe                                      *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2011 Clement Burin des Roziers                          *
   9  *   clement.burin-des-roziers@hikob.com                                   *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  25  ***************************************************************************/
  26
  27
  28 // Build : arm-eabi-gcc -c stm32lx.S
  29         .text
  30         .syntax unified
  31         .cpu cortex-m3
  32         .thumb
  33         .thumb_func
  34         .global write
  35
  36 /*
  37         r0 - destination address
  38         r1 - source address
  39         r2 - count
  40 */
  41
  42         // Set 0 to r3
  43         movs    r3, #0
  44         // Go to compare
  45         b.n test_done
  46
  47 write_word:
  48         // Load one word from address in r0, increment by 4
  49         ldr.w   ip, [r1], #4
  50         // Store the word to address in r1, increment by 4
  51         str.w   ip, [r0], #4
  52         // Increment r3
  53         adds    r3, #1
  54
  55 test_done:
  56         // Compare r3 and r2
  57         cmp     r3, r2
  58         // Loop if not zero
  59         bcc.n   write_word
  60
  61         // Set breakpoint to exit
  62         bkpt    #0x00
  63