STM32F单片机FLASH读写函数

作者：陈贞_Rock

转自：http://blog.chinaunix.net/uid-26729065-id-3419459.html

头文件：

文件名：FLASH.h

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#ifndef __FLASH_H__
#define __FLASH_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

源文件:

文件名：FLASH.c

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#include "FLASH.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 specifiedOption Byte Data address.
* @note This function can be usedfor all STM32F10x devices.
* @param Address: specifies the addressto be programmed.
* @param buf: specifies the datato be programmed.
* @param iNbrToWrite: the numberto write into flash
* @retval if success return the numberto write,-1iferror
*
*/
int Flash_Write(uint32_t iAddress, uint8_t*buf, uint32_t iNbrToWrite)
{
    /* Unlock the Flash Bank1 ProgramErase 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 specifiedOption Byte Data address.
* @note This function can be usedfor all STM32F10x devices.
* @param Address: specifies the addressto be programmed.
* @param buf: specifies the datato be programmed.
* @param iNbrToWrite: the numberto read from flash
* @retval if success return the numberto write, withouterror
*
*/
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;
}