diff options
Diffstat (limited to 'contrib/loaders/flash/max32xxx/max32xxx.s')
-rw-r--r-- | contrib/loaders/flash/max32xxx/max32xxx.s | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/contrib/loaders/flash/max32xxx/max32xxx.s b/contrib/loaders/flash/max32xxx/max32xxx.s new file mode 100644 index 00000000..f5306d6c --- /dev/null +++ b/contrib/loaders/flash/max32xxx/max32xxx.s @@ -0,0 +1,70 @@ +/*************************************************************************** + * Copyright (C) 2016 by Maxim Integrated * + * Kevin Gillespie <kevin.gillespie@maximintegrated.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, see <http://www.gnu.org/licenses/>. * + ***************************************************************************/ + +.text +.syntax unified +.cpu cortex-m3 +.thumb +.thumb_func + +/* + * Params : + * r0 = workarea start + * r1 = workarea end + * r2 = target address + * r3 = count (32bit words) + * r4 = pFLASH_CTRL_BASE + * + * Clobbered: + * r5 = FLASHWRITECMD + * r7 - rp + * r8 - wp, tmp + */ + +write: + +wait_fifo: +ldr r8, [r0, #0] /* read wp */ +cmp r8, #0 /* abort if wp == 0 */ +beq exit +ldr r7, [r0, #4] /* read rp */ +cmp r7, r8 /* wait until rp != wp */ +beq wait_fifo + +mainloop: +str r2, [r4, #0x00] /* FLSH_ADDR - write address */ +add r2, r2, #4 /* increment target address */ +ldr r8, [r7], #4 +str r8, [r4, #0x30] /* FLSH_DATA0 - write data */ +ldr r5, [r4, #0x08] /* FLSH_CN */ +orr r5, r5, #1 +str r5, [r4, #0x08] /* FLSH_CN - enable write */ +busy: +ldr r8, [r4, #0x08] /* FLSH_CN */ +tst r8, #1 +bne busy + +cmp r7, r1 /* wrap rp at end of buffer */ +it cs +addcs r7, r0, #8 /* skip loader args */ +str r7, [r0, #4] /* store rp */ +subs r3, r3, #1 /* decrement word count */ +cbz r3, exit /* loop if not done */ +b wait_fifo +exit: +bkpt |