40 lines
863 B
ArmAsm
40 lines
863 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
/***************************************************************************
|
|
* Copyright (C) 2015 by Ivan Meleca *
|
|
* ivan@artekit.eu *
|
|
***************************************************************************/
|
|
|
|
.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
|