diff options
| author | Angus Gratton <gus@projectgus.com> | 2014-06-27 16:13:24 +1000 |
|---|---|---|
| committer | Andreas Fritiofson <andreas.fritiofson@gmail.com> | 2015-02-11 22:00:46 +0000 |
| commit | 233f8859c0e5d0f6b94beba5435b56bda27c30e1 (patch) | |
| tree | 283fd8d467f732ad66a1a23de184a2fdb54961d8 /contrib/loaders | |
| parent | b2dc1af59a4cead2bd9446256ef31658b2a5de61 (diff) | |
nrf51 - Add async loader. Performance on nrf51822QAA/stlink-v2 from ~3.5KiB/s to ~19.5KiB/s.
Change-Id: Ib0bf41a0cec85f0bd5728551f8ad7f6255e4ea04
Signed-off-by: Angus Gratton <gus@projectgus.com>
[spamjunkeater@gmail.com: Cleanup buffer allocation, detect -1 for unknown pages]
Signed-off-by: Erdem U. Altunyurt <spamjunkeater@gmail.com>
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2204
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Diffstat (limited to 'contrib/loaders')
| -rw-r--r-- | contrib/loaders/flash/cortex-m0.S | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/contrib/loaders/flash/cortex-m0.S b/contrib/loaders/flash/cortex-m0.S new file mode 100644 index 00000000..a905a362 --- /dev/null +++ b/contrib/loaders/flash/cortex-m0.S @@ -0,0 +1,72 @@ +/*************************************************************************** + * Copyright (C) 2014 by Angus Gratton * + * Derived from stm32f1x.S: + * Copyright (C) 2011 by Andreas Fritiofson * + * andreas.fritiofson@gmail.com * + * Copyright (C) 2013 by Roman Dmitrienko * + * me@iamroman.org * + * * + * 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, see <http://www.gnu.org/licenses/>. * + ***************************************************************************/ + .text + .syntax unified + .cpu cortex-m0 + .thumb + .thumb_func + +/* Written for NRF51822 (src/flash/nor/nrf51.c) however the NRF NVMC is + * very generic (CPU blocks during flash writes), so this is actually + * just a generic word-oriented copy routine for cortex-m0 (also + * suitable for cortex m0plus/m3/m4.) + * + * To assemble: + * arm-none-eabi-gcc -c cortex-m0.S + * + * To disassemble: + * arm-none-eabi-objdump -o cortex-m0.o + * + * Thanks to Jens Bauer for providing advice on some of the tweaks. + */ + + /* Params: + * r0 - byte count (in) + * r1 - workarea start + * r2 - workarea end + * r3 - target address + * Clobbered: + * r4 - rp + * r5 - wp, tmp + */ + +wait_fifo: + ldr r5, [r1, #0] /* read wp */ + cmp r5, #0 /* abort if wp == 0 */ + beq exit + ldr r4, [r1, #4] /* read rp */ + cmp r4, r5 /* wait until rp != wp */ + beq wait_fifo + + ldmia r4!, {r5} /* "*target_address++ = *rp++" */ + stmia r3!, {r5} + + cmp r4, r2 /* wrap rp at end of work area buffer */ + bcc no_wrap + mov r4, r1 + adds r4, #8 /* skip rp,wp at start of work area */ +no_wrap: + str r4, [r1, #4] /* write back rp */ + subs r0, #4 /* decrement byte count */ + bne wait_fifo /* loop if not done */ +exit: + bkpt #0 |