Cortex-M4+example

				//-------------------------------------------------------------------------*
				// 文件名:start.c                                                          *
				// 说  明: CPU启动后进行系统配置                                           *
				//-------------------------------------------------------------------------*
				
				//头文件
				#include "common.h"
				#include "wdog.h"
				#include "sysinit.h"
				
				#pragma section = ".data"
				#pragma section = ".data_init"
				#pragma section = ".bss"
				#pragma section = "CodeRelocate"
				#pragma section = "CodeRelocateRam" 
				
				//内部函数声明
				//-------------------------------------------------------------------------*
				//函数名: common_startup                                                   *
				//功  能: 复制中断向量表到RAM中                                            * 
				//参  数: 无								   *	
				//说  明: 将ROM中的初始化数据拷贝到RAM中                                   *
				//-------------------------------------------------------------------------*
				void common_startup(void);
				
				//-------------------------------------------------------------------------*
				//函数名: start                                                            *
				//功  能: 系统启动                                                         * 
				//参  数: 无								   *	
				//说  明: 无                                                               *
				//-------------------------------------------------------------------------*
				void start(void)
				{
				    //关闭看门狗
				    wdog_disable();		
				    //复制中断向量表到RAM中
				    common_startup();	
				    //系统设置
				    sysinit();			
				    //进入主函数
				    main();				
				}
				
				
				//-------------------------------------------------------------------------*
				//函数名: common_startup                                                   *
				//功  能: 复制中断向量表到RAM中                                            * 
				//参  数: 无								   *	
				//说  明: 将ROM中的初始化数据拷贝到RAM中                                   *
				//-------------------------------------------------------------------------*
				void common_startup(void)
				{
				    /* Declare a counter we'll use in all of the copy loops */
				    uint32 n;
				 
				 
				    /* Addresses for VECTOR_TABLE and VECTOR_RAM come from the linker file */  
				    extern uint32 __VECTOR_TABLE[];
				    extern uint32 __VECTOR_RAM[];
				
				    /* Copy the vector table to RAM */
				    if (__VECTOR_RAM != __VECTOR_TABLE)
				    {
				        for (n = 0; n < 0x410; n++)
				            __VECTOR_RAM[n] = __VECTOR_TABLE[n];
				    }
				    /* Point the VTOR to the new copy of the vector table */
				    write_vtor((uint32)__VECTOR_RAM);    
				    
				    /* Get the addresses for the .data section (initialized data section) */
				    uint8* data_ram = __section_begin(".data");
				    uint8* data_rom = __section_begin(".data_init");
				    uint8* data_rom_end = __section_end(".data_init");
				    
				    /* Copy initialized data from ROM to RAM */
				    n = data_rom_end - data_rom;
				    while (n--)
				      *data_ram++ = *data_rom++;
				 
				 
				    /* Get the addresses for the .bss section (zero-initialized data) */
				    uint8* bss_start = __section_begin(".bss");
				    uint8* bss_end = __section_end(".bss");
				    
				    /* Clear the zero-initialized data section */
				    n = bss_end - bss_start;
				    while(n--)
				      *bss_start++ = 0;    
				    
				    /* Get addresses for any code sections that need to be copied from ROM to RAM.
				     * The IAR tools have a predefined keyword that can be used to mark individual
				     * functions for execution from RAM. Add "__ramfunc" before the return type in
				     * the function prototype for any routines you need to execute from RAM instead 
				     * of ROM. ex: __ramfunc void foo(void);
				     */
				    uint8* code_relocate_ram = __section_begin("CodeRelocateRam");
				    uint8* code_relocate = __section_begin("CodeRelocate");
				    uint8* code_relocate_end = __section_end("CodeRelocate");
				    
				    /* Copy functions from ROM to RAM */
				    n = code_relocate_end - code_relocate;
				    while (n--)
				      *code_relocate_ram++ = *code_relocate++;
				}