82 lines
2.4 KiB
ArmAsm
82 lines
2.4 KiB
ArmAsm
/***************************************************************************
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* Copyright (C) 2014 by Ladislav Bábel *
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* ladababel@seznam.cz *
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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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#define INITIAL_UNLOCK 0x5A
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#define MULTIPLE_UNLOCK 0xF2
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#define FLASHCTRL_KEY 0x4002E0C0
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#define FLASHCTRL_CONFIG 0x4002E000
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#define FLASHCTRL_WRADDR 0x4002E0A0
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#define FLASHCTRL_WRDATA 0x4002E0B0
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#define BUSYF 0x00100000
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/* Write the initial unlock value to KEY (0xA5) */
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movs r6, #INITIAL_UNLOCK
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str r6, [r0, #FLASHCTRL_KEY]
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/* Write the multiple unlock value to KEY (0xF2) */
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movs r6, #MULTIPLE_UNLOCK
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str r6, [r0, #FLASHCTRL_KEY]
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wait_fifo:
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ldr r6, [r2, #0]
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cmp r6, #0
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beq exit
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ldr r5, [r2, #4]
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cmp r5, r6
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beq wait_fifo
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/* wait for BUSYF flag */
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wait_busy1:
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ldr r6, [r0, #FLASHCTRL_CONFIG]
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tst r6, #BUSYF
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bne wait_busy1
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/* Write the destination address to WRADDR */
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str r4, [r0, #FLASHCTRL_WRADDR]
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/* Write the data half-word to WRDATA in right-justified format */
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ldrh r6, [r5]
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str r6, [r0, #FLASHCTRL_WRDATA]
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adds r5, #2
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adds r4, #2
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/* wrap rp at end of buffer */
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cmp r5, r3
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bcc no_wrap
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mov r5, r2
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adds r5, #8
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no_wrap:
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str r5, [r2, #4]
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subs r1, r1, #1
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cmp r1, #0
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beq exit
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b wait_fifo
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exit:
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movs r6, #MULTIPLE_LOCK
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str r6, [r0, #FLASHCTRL_KEY]
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/* wait for BUSYF flag */
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wait_busy2:
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ldr r6, [r0, #FLASHCTRL_CONFIG]
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tst r6, #BUSYF
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bne wait_busy2
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bkpt #0
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