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# start_boot.c

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    00001 /*This file has been prepared for Doxygen automatic documentation generation.*/
    00013
    00014 /* Copyright (c) 2007, 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  * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
    00030  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
    00031  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
    00032  * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
    00033  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    00034  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    00035  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    00036  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    00037  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    00038  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00039  */
    00040
    00041 #include "config.h"
    00042 #include "start_boot.h"
    00043 #include "lib_mcu/wdt/wdt_drv.h"
    00044
    00045 #ifdef __ICCAVR__
    00046    #if (defined(__AT90USB1287__) || defined(__AT90USB1286__))
    00047       void (*start_bootloader) (void)=(void (*)(void))0xf000;
    00048    #elif (defined(__AT90USB647__) || defined(__AT90USB646__))
    00049       void (*start_bootloader) (void)=(void (*)(void))0x7800;
    00050    #else
    00051       #error MCU part not define in project options
    00052    #endif
    00053 #elif defined __GNUC__
    00054    #if (defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB1286__))
    00055       void (*start_bootloader) (void)=(void (*)(void))0xf000;
    00056    #elif (defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB646__))
    00057       void (*start_bootloader) (void)=(void (*)(void))0x7800;
    00058    #else
    00059       #error MCU part not define in project options
    00060    #endif
    00061 #else // Other compiler
    00062    #error Compiler unknow
    00063 #endif
    00064
    00065 #ifdef __GNUC__
    00066    U32 boot_key __attribute__ ((section (".noinit")));
    00067 #else
    00068    __no_init U32 boot_key At(0x0100);
    00069 #endif
    00070
    00078 void start_boot(void)
    00079 {
    00080    boot_key=0x55AAAA55;
    00081
    00082    // Enable the WDT for reset mode
    00083    wdtdrv_enable(WDTO_500MS);
    00084    while(1);
    00085 }
    00086
    00087
    00093 void start_boot_if_required(void)
    00094 {
    00095   if(boot_key==GOTOBOOTKEY)
    00096   {
    00097       boot_key = 0;
    00098       (*start_bootloader)();
    00099   }
    00100 }
    00101
    00102
    00105 void goto_boot(void)
    00106 {
    00107    (*start_bootloader)();
    00108 }
    00109
    00110