71 lines
2.3 KiB
ArmAsm
71 lines
2.3 KiB
ArmAsm
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/***************************************************************************
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* Copyright (C) 2016 by Maxim Integrated *
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* Kevin Gillespie <kevin.gillespie@maximintegrated.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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***************************************************************************/
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.text
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.syntax unified
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.cpu cortex-m3
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.thumb
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.thumb_func
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/*
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* Params :
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* r0 = workarea start
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* r1 = workarea end
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* r2 = target address
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* r3 = count (32bit words)
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* r4 = pFLASH_CTRL_BASE
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*
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* Clobbered:
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* r5 = FLASHWRITECMD
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* r7 - rp
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* r8 - wp, tmp
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*/
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write:
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wait_fifo:
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ldr r8, [r0, #0] /* read wp */
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cmp r8, #0 /* abort if wp == 0 */
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beq exit
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ldr r7, [r0, #4] /* read rp */
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cmp r7, r8 /* wait until rp != wp */
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beq wait_fifo
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mainloop:
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str r2, [r4, #0x00] /* FLSH_ADDR - write address */
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add r2, r2, #4 /* increment target address */
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ldr r8, [r7], #4
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str r8, [r4, #0x30] /* FLSH_DATA0 - write data */
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ldr r5, [r4, #0x08] /* FLSH_CN */
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orr r5, r5, #1
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str r5, [r4, #0x08] /* FLSH_CN - enable write */
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busy:
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ldr r8, [r4, #0x08] /* FLSH_CN */
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tst r8, #1
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bne busy
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cmp r7, r1 /* wrap rp at end of buffer */
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it cs
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addcs r7, r0, #8 /* skip loader args */
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str r7, [r0, #4] /* store rp */
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subs r3, r3, #1 /* decrement word count */
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cbz r3, exit /* loop if not done */
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b wait_fifo
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exit:
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bkpt
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