读写STM32内部flash读写代码 -

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。

本文引用地址: http://www.21ic.com/app/mcu/201808/780803.htm

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 if(tmp[secoff+i]!=0XFF)break; //需要擦除
}
if(i FLASHStatus = FLASH_ErasePage(secpos); //擦除这个扇区
if(FLASHStatus != FLASH_COMPLETE)
return -1;
for(i=0;i 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