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ben-wpan/atusb/fw/flash.c
Stefan Schmidt 15b15b9524 flashi/spi: Use tabs instead of spaces.
Purely cosmetic. No idea when this sneaked in here.
2015-06-09 22:43:32 +02:00

98 lines
1.7 KiB
C

/*
* fw/flash.c - Board-specific flash functions
*
* Written 2011, 2013-2015 by Werner Almesberger
* Copyright 2011, 2013-2015 Werner Almesberger
*
* 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.
*/
#include <stdbool.h>
#include <stdint.h>
#include <avr/boot.h>
#include <avr/pgmspace.h>
#include "dfu.h"
#include "board.h"
static uint32_t payload;
static void flash_start(void)
{
payload = 0;
}
static bool flash_can_write(uint16_t size)
{
return payload+size <= BOOT_ADDR;
}
static void flash_write(const uint8_t *buf, uint16_t size)
{
static uint8_t last;
const uint8_t *p;
for (p = buf; p != buf+size; p++) {
if (!(payload & (SPM_PAGESIZE-1))) {
boot_page_erase(payload);
boot_spm_busy_wait();
}
if (payload & 1)
boot_page_fill(payload, last | (*p << 8));
else
last = *p;
payload++;
if (!(payload & (SPM_PAGESIZE-1))) {
boot_page_write(payload-SPM_PAGESIZE);
boot_spm_busy_wait();
}
}
}
static void flash_end_write(void)
{
if (payload & (SPM_PAGESIZE-1)) {
boot_page_write(payload & ~(SPM_PAGESIZE-1));
boot_spm_busy_wait();
}
boot_rww_enable();
}
static uint16_t flash_read(uint8_t *buf, uint16_t size)
{
uint16_t got = 0;
while (size && payload != (uint32_t) FLASHEND+1) {
*buf++ = pgm_read_byte(payload);
payload++;
size--;
got++;
}
return got;
}
static const struct dfu_flash_ops flash_ops = {
.start = flash_start,
.can_write = flash_can_write,
.write = flash_write,
.end_write = flash_end_write,
.read = flash_read,
};
const struct dfu_flash_ops *dfu_flash_ops = &flash_ops;