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/***************************************************************************
* Copyright (C) 2010 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* Copyright (C) 2011 Øyvind Harboe *
* oyvind.harboe@zylin.com *
* *
* Copyright (C) 2011 Clement Burin des Roziers *
* clement.burin-des-roziers@hikob.com *
* *
* Copyright (C) 2017 Armin van der Togt *
* armin@otheruse.nl *
* *
* 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. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
// Build : arm-eabi-gcc -c stm32lx.S
.text
.syntax unified
.cpu cortex-m0
.thumb
.thumb_func
.global write
/*
r0 - destination address
r1 - source address
r2 - count
*/
// r2 = source + count * 4
lsls r2, r2, #2
adds r2, r1, r2
// Go to compare
b test_done
write_word:
// load word from address in r1 and increase r1 by 4
ldmia r1!, {r3}
// store word to address in r0 and increase r0 by 4
stmia r0!, {r3}
test_done:
// compare r1 and r2
cmp r1, r2
// loop if not equal
bne write_word
// Set breakpoint to exit
bkpt #0x00
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