148 lines
5.4 KiB
C
148 lines
5.4 KiB
C
/****************************************************************************
|
|
* Copyright (c) 2011 by Michael Fischer. 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. Neither the name of the author nor the names of its contributors may
|
|
* be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "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 DISCLAIMED. IN NO EVENT SHALL
|
|
* THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
|
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
****************************************************************************
|
|
* History:
|
|
*
|
|
* 09.04.2011 mifi First Version
|
|
* 29.04.2011 mifi Call SystemInit, and set the Vector Table Offset
|
|
* before copy of data and bss segment.
|
|
****************************************************************************/
|
|
#define __CRT_C__
|
|
|
|
#include <stdint.h>
|
|
|
|
/*=========================================================================*/
|
|
/* DEFINE: All extern Data */
|
|
/*=========================================================================*/
|
|
/*
|
|
* The next data are defined by the linker script.
|
|
*/
|
|
extern unsigned long _stext;
|
|
extern unsigned long _etext;
|
|
extern unsigned long _sdata;
|
|
extern unsigned long _edata;
|
|
extern unsigned long _sbss;
|
|
extern unsigned long _ebss;
|
|
extern unsigned long _estack;
|
|
|
|
/* This is the main */
|
|
extern int main (void);
|
|
|
|
/*=========================================================================*/
|
|
/* DEFINE: Prototypes */
|
|
/*=========================================================================*/
|
|
extern uint32_t SystemInit (void) ; // __attribute__((weak));
|
|
|
|
/*=========================================================================*/
|
|
/* DEFINE: All code exported */
|
|
/*=========================================================================*/
|
|
|
|
/***************************************************************************/
|
|
/* SystemInit */
|
|
/* */
|
|
/* SystemInit is a function which is provided by the CMSIS interface. */
|
|
/* If this function is not available, we need a function here to prevent */
|
|
/* an error of the linker. Therefore this function is declared as weak. */
|
|
/***************************************************************************/
|
|
//uint32_t SystemInit (void)
|
|
//{
|
|
|
|
//} /* SystemInit */
|
|
|
|
extern uint32_t Master_frequency ;
|
|
|
|
/***************************************************************************/
|
|
/* ResetHandler */
|
|
/* */
|
|
/* This function is used for the C runtime initialisation, */
|
|
/* for handling the .data and .bss segments. */
|
|
/***************************************************************************/
|
|
void ResetHandler (void)
|
|
{
|
|
{
|
|
register uint32_t *pSrc;
|
|
register uint32_t *pDest;
|
|
register uint32_t m_freq ;
|
|
|
|
/*
|
|
* Call the SystemInit code from CMSIS interface if available.
|
|
* SystemInit is a week function which can be override
|
|
* by an external function.
|
|
*/
|
|
m_freq = SystemInit();
|
|
|
|
/*
|
|
* Set the "Vector Table Offset Register". From the ARM
|
|
* documentation, we got the following information:
|
|
*
|
|
* Use the Vector Table Offset Register to determine:
|
|
* - if the vector table is in RAM or code memory
|
|
* - the vector table offset.
|
|
*/
|
|
*((uint32_t*)0xE000ED08) = (uint32_t)&_stext;
|
|
|
|
/*
|
|
* Copy the initialized data of the ".data" segment
|
|
* from the flash to the are in the ram.
|
|
*/
|
|
pSrc = &_etext;
|
|
pDest = &_sdata;
|
|
while(pDest < &_edata)
|
|
{
|
|
*pDest++ = *pSrc++;
|
|
}
|
|
|
|
/*
|
|
* Clear the ".bss" segment.
|
|
*/
|
|
pDest = &_sbss;
|
|
while(pDest < &_ebss)
|
|
{
|
|
*pDest++ = 0;
|
|
}
|
|
Master_frequency = m_freq ;
|
|
}
|
|
|
|
/*
|
|
* And now the main function can be called.
|
|
* Scotty, energie...
|
|
*/
|
|
main();
|
|
|
|
/*
|
|
* In case there are problems with the
|
|
* "warp drive", stop here.
|
|
*/
|
|
while(1) {};
|
|
|
|
} /* ResetHandler */
|
|
|
|
/*** EOF ***/
|