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74 lines
1.3 KiB
C
74 lines
1.3 KiB
C
/*
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* fw/flash.c - Flash interface
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*
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* Written 2011, 2012 by Werner Almesberger
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* Copyright 2011, 2012 Werner Almesberger
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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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/*
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* Adapted from ben-wpan/atusb/fw/flash.c
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*/
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#include <stdint.h>
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#include <avr/boot.h>
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//#include <avr/pgmspace.h>
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#include "flash.h"
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static uint32_t payload;
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void flash_start(void)
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{
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payload = 0;
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}
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int flash_can_write(uint16_t size)
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{
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return payload <= BOOT_ADDR-size;
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}
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void flash_write(const uint8_t *buf, uint16_t size)
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{
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static uint8_t last;
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const uint8_t *p;
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for (p = buf; p != buf+size; p++) {
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if (!(payload & (SPM_PAGESIZE-1))) {
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boot_page_erase(payload);
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boot_spm_busy_wait();
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}
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if (payload & 1)
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boot_page_fill(payload, last | (*p << 8));
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else
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last = *p;
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payload++;
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if (!(payload & (SPM_PAGESIZE-1))) {
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boot_page_write(payload-SPM_PAGESIZE);
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boot_spm_busy_wait();
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}
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}
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}
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void flash_end_write(void)
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{
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if (payload & (SPM_PAGESIZE-1)) {
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boot_page_write(payload & ~(SPM_PAGESIZE-1));
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boot_spm_busy_wait();
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}
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boot_rww_enable();
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}
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