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----------------------------------

<span style="color:#009900;">#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;
}</span>

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

<span style="color:#009900;">#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)
#endifint Flash_Read(uint32_t iAddress, uint8_t *buf, int32_t iNbrToRead) ;
int Flash_Write(uint32_t iAddress, uint8_t *buf, uint32_t iNbrToWrite);#endif</span>