contrib/loaders/flash/stellaris.s

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Magnus Lundin                                   *
   3  *   lundin@mlu.mine.nu                                                    *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by Spencer Oliver                                  *
   6  *   spen@spen-soft.co.uk                                                  *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23
  24         .text
  25         .syntax unified
  26         .cpu cortex-m3
  27         .thumb
  28         .thumb_func
  29         .align  2
  30
  31 /*
  32         Call with :
  33         r0 = buffer address
  34         r1 = destination address
  35         r2 = bytecount (in) - endaddr (work)
  36
  37         Used registers:
  38         r3 = pFLASH_CTRL_BASE
  39         r4 = FLASHWRITECMD
  40         r5 = #1
  41         r6 = bytes written
  42         r7 = temp reg
  43 */
  44
  45 write:
  46         ldr     r3,pFLASH_CTRL_BASE
  47         ldr     r4,FLASHWRITECMD
  48         movs    r5, 1
  49         movs    r6, #0
  50 mainloop:
  51         str             r1, [r3, #0]
  52         ldr             r7, [r0, r6]
  53         str             r7, [r3, #4]
  54         str             r4, [r3, #8]
  55 waitloop:
  56         ldr             r7, [r3, #8]
  57         tst             r7, r5
  58         bne             waitloop
  59         adds    r1, r1, #4
  60         adds    r6, r6, #4
  61         cmp             r6, r2
  62         bne             mainloop
  63         bkpt    #0
  64
  65 pFLASH_CTRL_BASE: .word 0x400FD000
  66 FLASHWRITECMD: .word 0xA4420001