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ddd0022350
This prevents the boot loader from resetting all the time and makes it easier to "catch" it with dfu-util.
71 lines
1.2 KiB
C
71 lines
1.2 KiB
C
/*
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* fw/boot.c - DFU boot loader for ATUSB
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*
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* Written 2008-2011 by Werner Almesberger
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* Copyright 2008-2011 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 <stdint.h>
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#define F_CPU 8000000UL
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#include <util/delay.h>
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#include "usb.h"
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#include "dfu.h"
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#include "board.h"
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#include "spi.h"
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#include "atusb/ep0.h"
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#define MS_TO_LOOPS(ms) ((uint32_t) (ms)*81)
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static void (*run_payload)(void) = 0;
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int main(void)
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{
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/*
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* pgm_read_byte gets cached and there doesn't seem to be any other
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* way to dissuade gcc from doing this.
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*/
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volatile int zero = 0;
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uint32_t loop = 0;
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board_init();
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spi_init();
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reset_rf();
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/* now we should be at 8 MHz */
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usb_init();
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dfu_init();
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led(1);
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while (loop != MS_TO_LOOPS(2000)) {
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usb_poll();
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if (dfu.state == dfuIDLE && pgm_read_byte(zero) != 0xff)
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loop++;
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else
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loop = 0;
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}
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led(0);
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usb_reset();
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run_payload();
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while (1); /* not reached */
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}
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