start_boot.c

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/* Copyright (c) 2007, Atmel Corporation All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name of ATMEL may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
 * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */

#include "config.h"
#include "start_boot.h"
#include "lib_mcu/wdt/wdt_drv.h"

#ifdef __ICCAVR__
   #if (defined(__AT90USB1287__) || defined(__AT90USB1286__)) 
      void (*start_bootloader) (void)=(void (*)(void))0xf000;
   #elif (defined(__AT90USB647__) || defined(__AT90USB646__))
      void (*start_bootloader) (void)=(void (*)(void))0x7800;
   #else
      #error MCU part not define in project options
   #endif
#elif defined __GNUC__
   #if (defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB1286__)) 
      void (*start_bootloader) (void)=(void (*)(void))0xf000;
   #elif (defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB646__))
      void (*start_bootloader) (void)=(void (*)(void))0x7800;
   #else
      #error MCU part not define in project options
   #endif
#else // Other compiler
   #error Compiler unknow
#endif

#ifdef __GNUC__
   U32 boot_key __attribute__ ((section (".noinit")));
#else
   __no_init U32 boot_key At(0x0100); 
#endif
   
void start_boot(void)
{
   boot_key=0x55AAAA55;
   
   // Enable the WDT for reset mode
   wdtdrv_enable(WDTO_500MS);
   while(1);
}

   
void start_boot_if_required(void)
{
  if(boot_key==GOTOBOOTKEY)
  {
      boot_key = 0;
      (*start_bootloader)();           
  }
}


void goto_boot(void)
{
   (*start_bootloader)();              
}

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