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# 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