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   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  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26
  27
  28 // Build : arm-eabi-gcc -c stm32lx.S
  29     .text
  30     .syntax unified
  31     .cpu cortex-m0plus
  32     .thumb
  33     .thumb_func
  34     .global write
  35
  36 /*
  37     r0 - source address
  38     r1 - destination address
  39     r2 - count
  40 */
  41
  42     // Go to compare
  43     b test_done
  44
  45 write_word:
  46     // Load one word from address in r0, increment by 4
  47     ldr    r4, [r0]
  48     // Store the word to address in r1, increment by 4
  49     str    r4, [r1]
  50     // Decrement r2
  51     subs    r2, #1
  52         adds    r1, #4
  53         // does not matter, only first addr is important
  54         // next 15 bytes are in sequnce RM0367 page 66
  55         adds    r0, #4
  56
  57 test_done:
  58     // Test r2
  59     cmp     r2, #0
  60     // Loop if not zero
  61     bcc.n    write_word
  62
  63     // Set breakpoint to exit
  64     bkpt    #0x00