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 \r\n");

if( ((startaddress%PAGE_SIZE)+NumByteToWrite) > PAGE_SIZE ) /*超出一页范围

{

I2C_EE_BufferRead(0,0,(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!\r\n");

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(0,0,tempaddress,PAGE_SIZE,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!\r\n");

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!\r\n");

return ;

}

datasource += 4;

FlashAddress += 4;

}

}

}

else /*写的内容没有超出一页范围

{

printf("FlashWrire --in one page \r\n");

I2C_EE_BufferRead(0,0,(startaddress-(startaddress % 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, 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!\r\n");

return ;

}

datasource += 4;

FlashAddress += 4;

}

break;

}

}

}

/*******************起始指针在Flash页的开始端****************************

else

{ printf("startptr in Page head \r\n");

if((NumByteToWrite % PAGE_SIZE) != 0)

{

//读取1 PAGE 数据到内存，修改，然后写进去

I2C_EE_BufferRead(0,0,(u16)(tempaddress+NumByteToWrite-(NumByteToWrite % PAGE_SIZE)),PAGE_SIZE,buf1);

printf("already copy to bug1 \r\n");

memcpy(buf1,pRomData+NumByteToWrite-(NumByteToWrite % PAGE_SIZE),(NumByteToWrite % PAGE_SIZE));

//end of debug

}

//擦除Flash

if( (NumByteToWrite%PAGE_SIZE) == 0 )

{

pagenumber = NumByteToWrite/PAGE_SIZE;

}

else

{

pagenumber = NumByteToWrite/PAGE_SIZE + 1;

}

for (EraseCounter = 0; (EraseCounter < pagenumber) && (FLASHStatus == FLASH_COMPLETE); EraseCounter++)

{

FLASHStatus = FLASH_ErasePage(startaddress + (PAGE_SIZE * EraseCounter));

}

//写Flash

if( pagenumber == 1) /*只有一页

{

i=PAGE_SIZE/4;

datasource = (uint32_t)buf1;

FlashAddress = startaddress;

while(i-- >0)

{

FLASH_ProgramWord(FlashAddress,*(uint32_t *)datasource);

if (*(uint32_t *)FlashAddress != *(uint32_t *)datasource)

{

printf("I2C_EE_BufferWrite error!\r\n");

return ;

}

datasource +=4;

FlashAddress +=4;

}

}

else /*很多页时，先写前面页，最后写buf1

{

while( pagenumber-- > 1 )

{

datasource = (u32)pRomData;

FlashAddress = startaddress;

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!\r\n");

return ;

}

datasource += 4;

FlashAddress += 4;

}

}

//写后面的页

datasource = (uint32_t)buf1;

FlashAddress = startaddress+(pagenumber-1)*PAGE_SIZE;

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!\r\n");

return ;

}

datasource += 4;

FlashAddress += 4;

}

}

}

}