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   1 /***************************************************************************
   2  *   Copyright (C) 2015 by Ivan Meleca                                     *
   3  *   ivan@artekit.eu                                                       *
   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
  16         .text
  17         .cpu cortex-m0plus
  18         .code 16
  19         .thumb_func
  20
  21         .align  2
  22
  23         ldr             r3, wdog_cs1
  24         mov             r2, #127
  25         ldrb    r5, [r3]
  26         ldrb    r4, [r3, #1]
  27         and             r2, r5
  28         ldr             r5, unlock1
  29         ldrh    r0, [r3, #4]
  30         ldrh    r1, [r3, #6]
  31         strh    r5, [r3, #2]
  32         ldr             r5, unlock2
  33         strh    r5, [r3, #2]
  34         strb    r4, [r3, #1]
  35         strh    r0, [r3, #4]
  36         strh    r1, [r3, #6]
  37         strb    r2, [r3]
  38         bkpt    #0
  39
  40         .align  2
  41
  42 wdog_cs1:
  43         .word   0x40052000      // Watchdog Control and Status Register 1
  44 unlock1:
  45         .word   0x20C5          // 1st unlock word
  46 unlock2:
  47         .word   0x28D9          // 2nd unlock word