stlink/flashloaders/stm32lx.s

63 wiersze
2.5 KiB
ArmAsm

/***************************************************************************
* 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 *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
// Build : arm-eabi-gcc -c stm32lx.S
.text
.syntax unified
.cpu cortex-m3
.thumb
.thumb_func
.global write
/*
r0 - destination address
r1 - source address
r2 - count
*/
// Set 0 to r3
movs r3, #0
// Go to compare
b.n test_done
write_word:
// Load one word from address in r0, increment by 4
ldr.w ip, [r1], #4
// Store the word to address in r1, increment by 4
str.w ip, [r0], #4
// Increment r3
adds r3, #1
test_done:
// Compare r3 and r2
cmp r3, r2
// Loop if not zero
bcc.n write_word
// Set breakpoint to exit
bkpt #0x00