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ben-wpan/atusb/fw/flash.c
Werner Almesberger c265151d2b atusb/fw: introduced function flash_end_write to properly finish flashing
- dfu.h (flash_end_write), flash.c (flash_end_write): write any incomplete
  buffer
- flash.c (flash_write, flash_end_write): call boot_rww_enable only at the
  very end, it won't erase our buffer in mid-page
- usb/dfu.c (my_setup): call flash_end_write at the end of a download
2011-03-11 17:56:41 -03:00

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1.4 KiB
C

/*
* fw/flash.c - Board-specific flash functions
*
* Written 2011 by Werner Almesberger
* Copyright 2011 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 <stdint.h>
#include <avr/boot.h>
#include <avr/pgmspace.h>
#include "dfu.h"
#include "board.h"
static uint32_t payload;
void flash_start(void)
{
payload = 0;
}
int flash_can_write(uint16_t size)
{
return payload+size <= BOOT_ADDR;
}
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();
}
}
}
void flash_end_write(void)
{
if (payload & (SPM_PAGESIZE-1)) {
boot_page_write(payload & ~(SPM_PAGESIZE-1));
boot_spm_busy_wait();
}
boot_rww_enable();
}
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;
}