读写STM32内部flash读写代码

原文地址::http://blog.csdn.net/ws84643557/article/details/7391642

由于老师的要求，所以写了一份读写STM32内部FLASH的代码，这样的话就可以把STM32里面没有用来保存代码段的部分用来存储数据了。

由于《stm32flash编程手册》是很久很久以前看的，现在也没心情去仔细看那份手册了。大概浏览了一下，只看到了STM32里面的flash是以16位为单位读写的。

为什么记住这个，因为之前想写一个字节老是出错，所以翻翻手册，果然看到不能写1个字节数据。而且还发现，flash写地址为奇数时也会出错。所以这份代码里面

写flash的地址只能是偶数。浏览过程中还发现，手册里面说写flash和擦除flash的时候会影响cpu的运行速度，没仔细看（真心不想看）。其他具体手册里面的资料的话没有了，

看有没有高手仔细看完，然后写个总结什么的。。。

而且flash的读写保护也没看清楚，好像这些保护都是针对页大小来保护的话。这样的话就可以只保护代码段，这些放数据段不用保护了，这样可以省下flash芯片，不错吧。

废话不多说，直接上代码。。

flash读写代码也不用初始化，拿来直接就用。哈哈。。。。。。。。。。

-------------------DataFlash.c----------------------------------

#include "DataFlash.h"

uint16_t Flash_Write_Without_check(uint32_t iAddress, uint8_t *buf, uint16_t iNumByteToWrite) {

uint16_t i;

volatile FLASH_Status FLASHStatus = FLASH_COMPLETE;

i = 0;



// FLASH_UnlockBank1();

while((i < iNumByteToWrite) && (FLASHStatus == FLASH_COMPLETE))

{

FLASHStatus = FLASH_ProgramHalfWord(iAddress, *(uint16_t*)buf);

i = i+2;

iAddress = iAddress + 2;

buf = buf + 2;

}



return iNumByteToWrite;

}

/**

* @brief Programs a half word at a specified Option Byte Data address.

* @note This function can be used for all STM32F10x devices.

* @param Address: specifies the address to be programmed.

* @param buf: specifies the data to be programmed.

* @param iNbrToWrite: the number to write into flash

* @retval if success return the number to write, -1 if error

*

*/

int Flash_Write(uint32_t iAddress, uint8_t *buf, uint32_t iNbrToWrite) {

/* Unlock the Flash Bank1 Program Erase controller */

uint32_t secpos;

uint32_t iNumByteToWrite = iNbrToWrite;

uint16_t secoff;

uint16_t secremain;


uint16_t i = 0;

uint8_t tmp[FLASH_PAGE_SIZE];



FLASH_UnlockBank1();

secpos=iAddress & (~(FLASH_PAGE_SIZE -1 )) ;//扇区地址

secoff=iAddress & (FLASH_PAGE_SIZE -1); //在扇区内的偏移

secremain=FLASH_PAGE_SIZE-secoff; //扇区剩余空间大小

volatile FLASH_Status FLASHStatus = FLASH_COMPLETE;



if(iNumByteToWrite<=secremain) secremain = iNumByteToWrite;//不大于4096个字节



while( 1 ) {

Flash_Read(secpos, tmp, FLASH_PAGE_SIZE); //读出整个扇区

for(i=0;i<secremain;i++) { //校验数据

if(tmp[secoff+i]!=0XFF)break; //需要擦除

}

if(i<secremain) { //需要擦除

FLASHStatus = FLASH_ErasePage(secpos); //擦除这个扇区

if(FLASHStatus != FLASH_COMPLETE)

return -1;

for(i=0;i<secremain;i++) {
//复制

tmp[i+secoff]=buf[i];


}

Flash_Write_Without_check(secpos ,tmp ,FLASH_PAGE_SIZE);//写入整个扇区

} else {

Flash_Write_Without_check(iAddress,buf,secremain);//写已经擦除了的,直接写入扇区剩余区间.

}



if(iNumByteToWrite==secremain) //写入结束了

break;

else {

secpos += FLASH_PAGE_SIZE;

secoff = 0;//偏移位置为0

buf += secremain; //指针偏移

iAddress += secremain;//写地址偏移


iNumByteToWrite -= secremain;
//字节数递减

if(iNumByteToWrite>FLASH_PAGE_SIZE) secremain=FLASH_PAGE_SIZE;//下一个扇区还是写不完

else secremain = iNumByteToWrite;
//下一个扇区可以写完了

}



}



FLASH_LockBank1();

return iNbrToWrite;

}

/**

* @brief Programs a half word at a specified Option Byte Data address.

* @note This function can be used for all STM32F10x devices.

* @param Address: specifies the address to be programmed.

* @param buf: specifies the data to be programmed.

* @param iNbrToWrite: the number to read from flash

* @retval if success return the number to write, without error

*

*/

int Flash_Read(uint32_t iAddress, uint8_t *buf, int32_t iNbrToRead) {

int i = 0;

while(i < iNbrToRead ) {

*(buf + i) = *(__IO uint8_t*) iAddress++;

i++;

}

return i;

}

-------------------DataFlash.h----------------------------------

#ifndef __DATAFLASH_H__

#define __DATAFLASH_H__

#include "stm32f10x.h"

#include "stm32f10x_flash.h"

#if defined (STM32F10X_HD) || defined (STM32F10X_HD_VL) || defined (STM32F10X_CL) || defined (STM32F10X_XL)

#define FLASH_PAGE_SIZE ((uint16_t)0x800)



#else

#define FLASH_PAGE_SIZE ((uint16_t)0x400)

#endif

int Flash_Read(uint32_t iAddress, uint8_t *buf, int32_t iNbrToRead) ;

int Flash_Write(uint32_t iAddress, uint8_t *buf, uint32_t iNbrToWrite);

#endif