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100 lines
1.8 KiB
C
100 lines
1.8 KiB
C
/*
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* fw/fw.h - Firmware upload protocol
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*
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* Written 2012 by Werner Almesberger
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* Copyright 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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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#define F_CPU 8000000UL
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#include <util/delay.h>
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#include "io.h"
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#include "flash.h"
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#include "proto.h"
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#include "rf.h"
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#include "fw.h"
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static const uint8_t unlock_secret[PAYLOAD] = {
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#include "unlock-secret.inc"
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};
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static bool locked = 1;
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static bool fw_payload(uint8_t seq, uint8_t limit, const uint8_t *payload)
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{
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if (!seq) {
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locked = memcmp(unlock_secret, payload, PAYLOAD) != 0;
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flash_start();
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return 1;
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}
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if (locked)
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return 0;
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if (!flash_can_write(PAYLOAD))
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return 0;
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flash_write(payload, PAYLOAD);
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if (seq == limit)
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flash_end_write();
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return 1;
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}
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bool fw_packet(const uint8_t *buf, uint8_t len)
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{
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static uint8_t seq = 0;
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static uint8_t limit;
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uint8_t ack[] = { FIRMWARE+1, buf[1], buf[2] };
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/* short flash to indicate reception */
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SET(LED_B7);
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_delay_ms(1);
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CLR(LED_B7);
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/* Check packet for formal validity */
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if (len != 64+3)
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return 0;
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if (buf[0] != FIRMWARE)
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return 0;
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if (buf[1] > buf[2])
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return 0;
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/* Synchronize sequence numbers */
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if (!buf[1]) {
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seq = 0;
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limit = buf[2];
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} else {
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if (buf[2] != limit)
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return 0;
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if (buf[1]+1 == seq)
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goto ack;
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if (buf[1] != seq)
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return 0;
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}
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/* Process the payload */
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if (!fw_payload(seq, limit, buf+3))
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return 0;
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seq++;
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ack:
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/* clearly visible short blink to indicate progress */
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SET(LED_B6);
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rf_send(ack, sizeof(ack));
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CLR(LED_B6);
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return 1;
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}
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