89 lines
3.8 KiB
C
89 lines
3.8 KiB
C
/************************************************************************************//**
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* \file Demo\ARMCM4_STM32F4_Olimex_STM32E407_GCC\Prog\cstart.c
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* \brief Demo program C startup source file.
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* \ingroup Prog_ARMCM4_STM32F4_Olimex_STM32E407_GCC
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* \internal
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*----------------------------------------------------------------------------------------
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* C O P Y R I G H T
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*----------------------------------------------------------------------------------------
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* Copyright (c) 2013 by Feaser http://www.feaser.com All rights reserved
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*
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*----------------------------------------------------------------------------------------
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* L I C E N S E
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*----------------------------------------------------------------------------------------
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* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You have received a copy of the GNU General Public License along with OpenBLT. It
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* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
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*
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* \endinternal
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****************************************************************************************/
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/****************************************************************************************
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* Include files
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****************************************************************************************/
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#include "header.h" /* generic header */
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/****************************************************************************************
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* External function protoypes
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****************************************************************************************/
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extern int main(void);
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/****************************************************************************************
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* External data declarations
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****************************************************************************************/
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/* these externals are declared by the linker */
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extern unsigned long _etext;
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extern unsigned long _data;
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extern unsigned long _edata;
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extern unsigned long _bss;
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extern unsigned long _ebss;
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extern unsigned long _estack;
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/************************************************************************************//**
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** \brief Reset interrupt service routine. Configures the stack, initializes
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** RAM and jumps to function main.
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** \return none.
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**
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****************************************************************************************/
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void reset_handler(void)
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{
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unsigned long *pSrc, *pDest;
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/* initialize stack pointer */
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__asm(" ldr r1, =_estack\n"
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" mov sp, r1");
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/* copy the data segment initializers from flash to SRAM */
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pSrc = &_etext;
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for(pDest = &_data; pDest < &_edata; )
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{
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*pDest++ = *pSrc++;
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}
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/* zero fill the bss segment. this is done with inline assembly since this will
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* clear the value of pDest if it is not kept in a register.
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*/
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__asm(" ldr r0, =_bss\n"
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" ldr r1, =_ebss\n"
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" mov r2, #0\n"
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" .thumb_func\n"
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"zero_loop:\n"
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" cmp r0, r1\n"
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" it lt\n"
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" strlt r2, [r0], #4\n"
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" blt zero_loop");
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/* start the software application by calling its entry point */
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main();
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} /*** end of reset_handler ***/
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/************************************ end of cstart.c **********************************/ |