mirror of
git://projects.qi-hardware.com/antorcha.git
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90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/*
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* fw/boot.c - Antorcha boot loader
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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 <avr/io.h>
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#include <avr/pgmspace.h>
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#include "io.h"
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#include "rf.h"
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#include "proto.h"
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#include "dispatch.h"
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#include "fw.h"
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#define MS_TO_LOOP(ms) ((uint32_t) (ms)*106)
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static void wait_upload(void)
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{
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uint8_t buf[PAYLOAD+5]; /* 3 bytes header, 2 bytes CRC */
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uint32_t i;
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uint8_t got;
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restart:
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for (i = 0; i != MS_TO_LOOP(5000); i++) {
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got = rf_recv(buf, sizeof(buf));
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if (got > 2 && fw_packet(buf, got-2))
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goto restart;
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}
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}
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int main(void)
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{
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volatile int zero = 0;
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/* Port B has two LEDs and the rest is SPI */
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PORTB = MASK(B, RF_nSS) | MASK(B, RF_nRST);
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DDRB = MASK(B, RF_SCLK) | MASK(B, RF_MOSI) | MASK(B, RF_nSS) |
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MASK(B, RF_nRST) | 0xc0;
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/* All port C pins drive LEDs */
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PORTC = 0;
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DDRC = 0x3f;
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/* All port D pins drive LEDs */
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PORTD = 0;
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DDRD = 0xff;
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/* Disable pull-ups */
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MCUCR |= 1 << PUD;
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/*
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* Disable the watchdog timer, in case the boot loader has been
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* entered by a watchdog reset commanded by the application.
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*/
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MCUSR = 0; /* Remove override */
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WDTCSR |= 1 << WDCE; /* Enable change */
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WDTCSR = 1 << WDCE; /* Disable watchdog while still enabling
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change */
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rf_init();
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/*
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* Switch the LED inside the loop so that we get a short pulse one can
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* observe on a scope.
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*/
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do {
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SET(LED_B8);
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wait_upload();
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CLR(LED_B8);
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} while (pgm_read_byte(zero) == 0xff);
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((void (*)(void)) 0)();
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/* not reached */
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return 0;
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}
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