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