start_boot.c

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00001 /*This file is prepared for Doxygen automatic documentation generation.*/
00013 
00014 /* Copyright (c) 2009 Atmel Corporation. All rights reserved.
00015  *
00016  * Redistribution and use in source and binary forms, with or without
00017  * modification, are permitted provided that the following conditions are met:
00018  *
00019  * 1. Redistributions of source code must retain the above copyright notice,
00020  * this list of conditions and the following disclaimer.
00021  *
00022  * 2. Redistributions in binary form must reproduce the above copyright notice,
00023  * this list of conditions and the following disclaimer in the documentation
00024  * and/or other materials provided with the distribution.
00025  *
00026  * 3. The name of Atmel may not be used to endorse or promote products derived
00027  * from this software without specific prior written permission.
00028  *
00029  * 4. This software may only be redistributed and used in connection with an Atmel
00030  * AVR product.
00031  *
00032  * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
00033  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00034  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE EXPRESSLY AND
00035  * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
00036  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00037  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
00038  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00039  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00040  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00041  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00042  */
00043 
00044 #include "config.h"
00045 #include "start_boot.h"
00046 #include "lib_mcu/wdt/wdt_drv.h"
00047 
00048 #ifdef __ICCAVR__
00049    #if (defined(__ATmega32U4__) || defined(__ATmega32U6__)) 
00050       void (*start_bootloader) (void)=(void (*)(void))0x3800;
00051    #elif defined(__ATmega16U4__)
00052       void (*start_bootloader) (void)=(void (*)(void))0x1800;
00053    #else
00054       #error MCU part not define in project options
00055    #endif
00056 #elif defined __GNUC__
00057    #if (defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega32U6__)) 
00058       void (*start_bootloader) (void)=(void (*)(void))0x3800;
00059    #elif defined(__AVR_ATmega16U4__)
00060       void (*start_bootloader) (void)=(void (*)(void))0x1800;
00061    #else
00062       #error MCU part not define in project options
00063    #endif
00064 #else // Other compiler
00065    #error Compiler unknow
00066 #endif
00067 
00068 
00069 #ifdef __GNUC__
00070    U32 boot_key __attribute__ ((section (".noinit")));
00071 #else
00072    __no_init U32 boot_key At(0x0100); 
00073 #endif
00074    
00082 void start_boot(void)
00083 {
00084    boot_key=0x55AAAA55;
00085    
00086    // Enable the WDT for reset mode
00087    wdtdrv_enable(WDTO_500MS);
00088    while(1);
00089 }
00090 
00091    
00097 void start_boot_if_required(void)
00098 {
00099   if(boot_key==GOTOBOOTKEY)
00100   {
00101       boot_key = 0;
00102       (*start_bootloader)();           
00103   }
00104 }
00105 
00106 
00109 void goto_boot(void)
00110 {
00111    (*start_bootloader)();              
00112 }
00113 
00114 

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