habl.c

Henriks AVR Boot Loader for AVR ATMEGA88 with xmodem and autoboot

/*
habl.c

Copyright Henrik Bj鰎kman www.eit.se/hb 2007

This file 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.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

If you do modify it please make a note about it in the history 
section below.


History

2007-03-15
Created
Henrik Bj鰎kman

*/


#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/wdt.h>

/*#include <stdio.h>*/
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "avr_cfg.h"
#include "avr_uart.h"
/*#include "version.h"*/
#include "xmodem.h"


#define TIMERCOUNT_START_VALUE (90000L*(AVR_FOSC/1000000L))

#define CANCEL_AUTOBOOT_CHAR 27
#define N_CANCEL_CHARS_REQUESTED 5


void (*app)(void)=0;




int main( void ) 
{
  long timerCount=TIMERCOUNT_START_VALUE;
  unsigned char xCount=0;

#ifdef ENABLE_WDT
  wdt_enable(WDTO_2S);
#endif

  uart_init();

  uart_print_P(PSTR(VERSION_STRING)); 

  while(timerCount!=0)
  {
    int c=uart_getchar();
    if (c==CANCEL_AUTOBOOT_CHAR)
    {
      // It was an esc char. Now count the number of these.
      ++xCount;
    }
    else if (c>0)
    {
      // It was not an ecs char.
      xCount=0;
      break;
    }
    timerCount--;
  }

  if (xCount==N_CANCEL_CHARS_REQUESTED)
  {
    xmodem();
  }


  // Call the application.
  (app)();


  return(0);
} // end main()