STM32 对内部FLASH读写接口函数

原文地址::http://blog.sina.com.cn/s/blog_6035432c0100vcve.html

因为要用内部FLASH代替外部EEPROM，把参数放在STM32的0x08000000+320K处，其中20K是bootloader，300K是应用程序。

原理：先要把整页FLASH的内容搬到RAM中，然后在RAM中改动，然后擦除整页FLASH，再把改动后的内容写入原Flash页。下面程序调试通过。

/*******************************************************************************
* Function Name??: I2C_EE_BufferRead
* Description????: Reads a block of data from the EEPROM.
* Input??????????:
*??????????????????-RomAddr
*??????????????????-NumByteToRead
*??????????????????-pRomData
* Output?????????: None
* Return?????????: None
*******************************************************************************

void I2C_EE_BufferRead(u16 RomAddr,u16 NumByteToRead,u8 *pRomData)
{?

????u32 param_flashbase;
????u8* ptr;

????param_flashbase = 0x8000000+(300+20)*1024;
????ptr = (u8*)(param_flashbase + RomAddr);

????while( NumByteToRead-- >0)
????{
????????*pRomData = *ptr;????????????//直接赋值即可
?????????printf("0x%x ",*pRomData);?
?????????pRomData++;
?????????ptr++;
????}
????return;
}?

?

/*******************************************************************************
* Function Name??:?I2C_EE_BufferWrite

* Description????:?Write a block of data?to the EEPROM.
* Input??????????:
*??????????????????-RomAddr
*??????????????????-NumByteToRead
*??????????????????-pRomData
* Output?????????: None
* Return?????????: None
*******************************************************************************

void I2C_EE_BufferWrite(u8 DeviceType,u8 SlaveAddr,u16 RomAddr,u16 NumByteToWrite,u8 *pRomData)
{

??uint32_t param_flashbase;
??uint32_t??tempaddress;
??uint32_t??startaddress;
??uint32_t FlashAddress;
??uint32_t datasource;
??u8 buf1[PAGE_SIZE];
??u8 buf2[PAGE_SIZE];
??u32 pagenumber = 0x0;
??u32 EraseCounter = 0x0;
??u32 i = 0;
??FLASH_Status FLASHStatus = FLASH_COMPLETE;

??param_flashbase = 0x8000000+(300+20)*1024;
??startaddress=tempaddress = param_flashbase+RomAddr;

?/*********************起始指针不在Flash页的开始端*********************
?if( (tempaddress%PAGE_SIZE) != 0)
?{???printf("startptr??not in Page head rn");
??if(??((startaddress%PAGE_SIZE)+NumByteToWrite) >??PAGE_SIZE???)?/*超出一页范围
??{
??????I2C_EE_BufferRead(0,(tempaddress-(tempaddress % PAGE_SIZE)),PAGE_SIZE,buf1);??/*把起始地址所在页的内容读到内存buf1中
??????memcpy(buf1+(tempaddress % PAGE_SIZE),pRomData,PAGE_SIZE-(tempaddress % PAGE_SIZE));??/*把需要写入的数据覆盖到buf1中

??????while(??FLASHStatus == FLASH_ErasePage(tempaddress)???)???????/*buf1写入到Flash
?????{
?????????i=PAGE_SIZE/4;
?????????datasource = (uint32_t)buf1;
????
?????????FlashAddress = tempaddress-(tempaddress % PAGE_SIZE);
?????????while(i-- >0)
?????????{
?????????????FLASH_ProgramWord(FlashAddress,*(uint32_t*)datasource);
?????????????if (*(uint32_t*)FlashAddress != *(uint32_t*)datasource)???????????
?????????{
??????????printf("I2C_EE_BufferWrite error!rn");
??????????return ;
??????????}
??????????datasource += 4;
??????????FlashAddress += 4;????
????}
????break;
???}
??????
???NumByteToWrite -= PAGE_SIZE-(startaddress % PAGE_SIZE);?需要写入字节数减去，上面覆盖上去的数据的字节数
???tempaddress += ?PAGE_SIZE-(tempaddress % PAGE_SIZE);????????/*把ptr指针指向下一个页起始位置

???if((NumByteToWrite % PAGE_SIZE) != 0)?/*末指针不在Flash页的开始端
???{
???????//读取1 PAGE 数据到内存，修改，然后写进去
???????I2C_EE_BufferRead(0,tempaddress,buf2);
???????memcpy(buf2,pRomData+PAGE_SIZE-startaddress%PAGE_SIZE+NumByteToWrite-NumByteToWrite%PAGE_SIZE,(NumByteToWrite%PAGE_SIZE));

????while(??FLASHStatus == FLASH_ErasePage( tempaddress+NumByteToWrite) )???/*把buf2写入到Flash中*
????{
????????i=PAGE_SIZE/4;
????????datasource = (uint32_t)buf2;
????????FlashAddress = (tempaddress+NumByteToWrite-(NumByteToWrite % PAGE_SIZE));??/*末地址指针的页首
????????while(i-- >0)
???????{
???????????FLASH_ProgramWord(FlashAddress,*(uint32_t*)datasource);
???????????if (*(uint32_t*)FlashAddress != *(uint32_t*)datasource)????????????
???????????{
????????????????printf("I2C_EE_BufferWrite error!rn");
????????????????return ;
????????????}
????????????datasource += 4;
????????????FlashAddress += 4;??????????

??????}
?????break;
????}??????
???}
??
???NumByteToWrite -= NumByteToWrite % PAGE_SIZE;
????
???//擦除Flash
????pagenumber =??NumByteToWrite/PAGE_SIZE;

?????for (EraseCounter = 0; (EraseCounter < pagenumber) && (FLASHStatus == FLASH_COMPLETE); EraseCounter++)
???{
?????????FLASHStatus = FLASH_ErasePage( tempaddress + PAGE_SIZE*EraseCounter );
???}
???//写Flash
???datasource = *(uint32_t *)(pRomData+ PAGE_SIZE-(startaddress % PAGE_SIZE)??);
???FlashAddress = tempaddress;
?
???while( pagenumber-- > 0 )
???{
????i=PAGE_SIZE/4;
????while(i -- >0)
????{
????????????FLASH_ProgramWord(FlashAddress,*(uint32_t*)datasource);
????????????if (*(uint32_t*)FlashAddress != *(uint32_t*)datasource)
???????????{
???????????????printf("I2C_EE_BufferWrite error!rn");
???????????????return ;
???????????}
???????????datasource += 4;
???????????FlashAddress += 4;
????}
???}
??}
??else?/*写的内容没有超出一页范围
??{
???printf("FlashWrire --in one page rn");
???I2C_EE_BufferRead(0,(startaddress-(startaddress % PAGE_SIZE)),buf1);?????/*把起始地址所在页的内容读到内存buf1中???
???memcpy( (buf1+(tempaddress % PAGE_SIZE)),NumByteToWrite );??/*把需要写入的数据覆盖到buf1中
???while(??FLASHStatus == FLASH_ErasePage(tempaddress)???)
???{
??????i=PAGE_SIZE/4;
??????datasource = (uint32_t)buf1;
??????FlashAddress = tempaddress-(tempaddress % PAGE_SIZE);
??????while(i-- >0)
??????{
????????FLASH_ProgramWord(FlashAddress,*(uint32_t*)datasource);
????????if (*(uint32_t *)FlashAddress != *(uint32_t *)datasource)?/*读取Flash中的数据，看是否写入正确
????????{
???????????????printf("I2C_EE_BufferWrite error!rn");
????????????