mirror of
git://projects.qi-hardware.com/antorcha.git
synced 2024-11-22 15:25:00 +02:00
90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/*
|
|
* fw/boot.c - Antorcha boot loader
|
|
*
|
|
* Written 2012 by Werner Almesberger
|
|
* Copyright 2012 Werner Almesberger
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
|
|
#include <avr/io.h>
|
|
#include <avr/pgmspace.h>
|
|
|
|
#include "io.h"
|
|
#include "rf.h"
|
|
#include "proto.h"
|
|
#include "dispatch.h"
|
|
#include "fw.h"
|
|
|
|
|
|
#define MS_TO_LOOP(ms) ((uint32_t) (ms)*106)
|
|
|
|
|
|
static void wait_upload(void)
|
|
{
|
|
uint8_t buf[PAYLOAD+5]; /* 3 bytes header, 2 bytes CRC */
|
|
uint32_t i;
|
|
uint8_t got;
|
|
|
|
restart:
|
|
for (i = 0; i != MS_TO_LOOP(5000); i++) {
|
|
got = rf_recv(buf, sizeof(buf));
|
|
if (got > 2 && fw_packet(buf, got-2))
|
|
goto restart;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
int main(void)
|
|
{
|
|
volatile int zero = 0;
|
|
|
|
/* Port B has two LEDs and the rest is SPI */
|
|
PORTB = MASK(B, RF_nSS) | MASK(B, RF_nRST);
|
|
DDRB = MASK(B, RF_SCLK) | MASK(B, RF_MOSI) | MASK(B, RF_nSS) |
|
|
MASK(B, RF_nRST) | 0xc0;
|
|
|
|
/* All port C pins drive LEDs */
|
|
PORTC = 0;
|
|
DDRC = 0x3f;
|
|
|
|
/* All port D pins drive LEDs */
|
|
PORTD = 0;
|
|
DDRD = 0xff;
|
|
|
|
/* Disable pull-ups */
|
|
MCUCR |= 1 << PUD;
|
|
|
|
/*
|
|
* Disable the watchdog timer, in case the boot loader has been
|
|
* entered by a watchdog reset commanded by the application.
|
|
*/
|
|
|
|
MCUSR = 0; /* Remove override */
|
|
WDTCSR |= 1 << WDCE; /* Enable change */
|
|
WDTCSR = 1 << WDCE; /* Disable watchdog while still enabling
|
|
change */
|
|
|
|
rf_init();
|
|
|
|
/*
|
|
* Switch the LED inside the loop so that we get a short pulse one can
|
|
* observe on a scope.
|
|
*/
|
|
do {
|
|
SET(LED_B8);
|
|
wait_upload();
|
|
CLR(LED_B8);
|
|
} while (pgm_read_byte(zero) == 0xff);
|
|
|
|
((void (*)(void)) 0)();
|
|
|
|
/* not reached */
|
|
return 0;
|
|
}
|