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atusb/fw/flash.c: added basic writing support (untested)

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This commit is contained in:
Werner Almesberger 2011-03-09 02:02:05 -03:00
parent 1dcc83391e
commit b8fc1a7f54
1 changed files with 31 additions and 6 deletions
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37
atusb/fw/flash.c
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@ -13,30 +13,55 @@
#include <stdint.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#define F_CPU 8000000UL
#include <util/delay.h>
#include <avr/boot.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 0;
return 1;
}
void flash_write(const uint8_t *buf, uint16_t size)
{
static uint8_t last;
const uint8_t *p;
eeprom_busy_wait();
for (p = buf; p != buf+size; p++) {
if (!(payload & (SPM_PAGESIZE-1))) {
if (payload) {
boot_page_write(payload-SPM_PAGESIZE);
boot_spm_busy_wait();
}
boot_page_erase(payload);
boot_spm_busy_wait();
}
if (payload & 1)
boot_page_fill(payload, last | (*p << 0));
else
last = *p;
payload++;
}
if (!(payload & (SPM_PAGESIZE-1))) {
boot_page_write(payload);
boot_spm_busy_wait();
}
boot_rww_enable();
}