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/***************************************************************************
* Copyright (C) 2015 by Ivan Meleca *
* ivan@artekit.eu *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
***************************************************************************/
.text
.cpu cortex-m0plus
.code 16
.thumb_func
.align 2
ldr r3, wdog_cs1
mov r2, #127
ldrb r5, [r3]
ldrb r4, [r3, #1]
and r2, r5
ldr r5, unlock1
ldrh r0, [r3, #4]
ldrh r1, [r3, #6]
strh r5, [r3, #2]
ldr r5, unlock2
strh r5, [r3, #2]
strb r4, [r3, #1]
strh r0, [r3, #4]
strh r1, [r3, #6]
strb r2, [r3]
bkpt #0
.align 2
wdog_cs1:
.word 0x40052000 // Watchdog Control and Status Register 1
unlock1:
.word 0x20C5 // 1st unlock word
unlock2:
.word 0x28D9 // 2nd unlock word
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