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55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/*
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* fw/reset.c - Reset 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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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include "proto.h"
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#include "dispatch.h"
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/*
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* For now, we use the unlock secret for reset as well. The reasoning is as
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* follows:
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*
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* - both secrets are transmitted in the clear and can therefore only be
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* used in a trusted environment,
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* - both secrets are used mainly during development and not needed for regular
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* operation,
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* - RESET is normally followed immediately by FIRMWARE, so a listener could
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* intercept the secret(s) either way.
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*/
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static const uint8_t reset_secret[PAYLOAD] PROGMEM = {
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#include "unlock-secret.inc"
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};
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static bool reset_first(uint8_t limit, const uint8_t *payload)
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{
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if (memcmp_P(payload, reset_secret, PAYLOAD))
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return 0;
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WDTCSR = 1 << WDE;
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return 1;
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}
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struct handler reset_handler = {
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.type = RESET,
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.first = reset_first,
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};
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