STM32 对内部FLASH读写接口函数（转）
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; } } } }
