94 lines
4.1 KiB
C
94 lines
4.1 KiB
C
/************************************************************************************//**
|
|
* \file Demo\ARMCM3_EFM32_Olimex_EM32G880F128STK_GCC\Prog\cstart.c
|
|
* \brief Demo program C startup source file.
|
|
* \ingroup Prog_ARMCM3_EFM32_Olimex_EM32G880F128STK_GCC
|
|
* \internal
|
|
*----------------------------------------------------------------------------------------
|
|
* C O P Y R I G H T
|
|
*----------------------------------------------------------------------------------------
|
|
* Copyright (c) 2012 by Feaser http://www.feaser.com All rights reserved
|
|
*
|
|
*----------------------------------------------------------------------------------------
|
|
* L I C E N S E
|
|
*----------------------------------------------------------------------------------------
|
|
* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation, either version 3 of the License, or (at your option) any later
|
|
* version.
|
|
*
|
|
* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
|
|
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
* PURPOSE. See the GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with OpenBLT.
|
|
* If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* A special exception to the GPL is included to allow you to distribute a combined work
|
|
* that includes OpenBLT without being obliged to provide the source code for any
|
|
* proprietary components. The exception text is included at the bottom of the license
|
|
* file <license.html>.
|
|
*
|
|
* \endinternal
|
|
****************************************************************************************/
|
|
|
|
/****************************************************************************************
|
|
* Include files
|
|
****************************************************************************************/
|
|
#include "header.h" /* generic header */
|
|
|
|
|
|
/****************************************************************************************
|
|
* External function protoypes
|
|
****************************************************************************************/
|
|
extern int main(void);
|
|
|
|
|
|
/****************************************************************************************
|
|
* External data declarations
|
|
****************************************************************************************/
|
|
/* these externals are declared by the linker */
|
|
extern unsigned long _etext;
|
|
extern unsigned long _data;
|
|
extern unsigned long _edata;
|
|
extern unsigned long _bss;
|
|
extern unsigned long _ebss;
|
|
extern unsigned long _estack;
|
|
|
|
|
|
/************************************************************************************//**
|
|
** \brief Reset interrupt service routine. Configures the stack, initializes
|
|
** RAM and jumps to function main.
|
|
** \return none.
|
|
**
|
|
****************************************************************************************/
|
|
void reset_handler(void)
|
|
{
|
|
unsigned long *pSrc, *pDest;
|
|
|
|
/* initialize stack pointer */
|
|
__asm(" ldr r1, =_estack\n"
|
|
" mov sp, r1");
|
|
/* copy the data segment initializers from flash to SRAM */
|
|
pSrc = &_etext;
|
|
for(pDest = &_data; pDest < &_edata; )
|
|
{
|
|
*pDest++ = *pSrc++;
|
|
}
|
|
/* zero fill the bss segment. this is done with inline assembly since this will
|
|
* clear the value of pDest if it is not kept in a register.
|
|
*/
|
|
__asm(" ldr r0, =_bss\n"
|
|
" ldr r1, =_ebss\n"
|
|
" mov r2, #0\n"
|
|
" .thumb_func\n"
|
|
"zero_loop:\n"
|
|
" cmp r0, r1\n"
|
|
" it lt\n"
|
|
" strlt r2, [r0], #4\n"
|
|
" blt zero_loop");
|
|
/* start the software application by calling its entry point */
|
|
main();
|
|
} /*** end of reset_handler ***/
|
|
|
|
|
|
/************************************ end of cstart.c **********************************/ |