STM32 对内部FLASH读写接口函数
扫描二维码
随时随地手机看文章
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(0,0,(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(0,0,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!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(0,0,(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!rn");
return ;
}
datasource += 4;
FlashAddress += 4;
}
break;
}
}
}
/*******************起始指针在Flash页的开始端****************************/
else
{ printf("startptr in Page head rn");
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 rn");
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(sta
下载文档
