关于stm32f407 掉电保存问题

只看该作者 · 2019-2-11 17:49

请问大神们使用库，如何读取stm32f407的flash，给个可用的例程，想做掉电保存

只看该作者 · 2019-2-11 18:34

看看跟flash有关的头文件。

1万 · 2019-2-12 17:00

感觉你是要做FLASH的存取操作吧，你可以去ST官网搜索下载AN3969.

EEPROM emulation in STM32F40x/STM32F41x microcontrollers (AN3969)

只看该作者 · 2019-2-14 11:52

C:\Users\Administrator\Desktop\微信图片_20190214115053.png

只看该作者 · 2019-2-14 11:53

u32 STMFLASH_ReadWord(u32 faddr)
{
return *(vu32*)faddr;
}

uint16_t STMFLASH_GetFlashSector(u32 addr)
{
if(addr<ADDR_FLASH_SECTOR_1)return FLASH_Sector_0;
else if(addr<ADDR_FLASH_SECTOR_2)return FLASH_Sector_1;
else if(addr<ADDR_FLASH_SECTOR_3)return FLASH_Sector_2;
else if(addr<ADDR_FLASH_SECTOR_4)return FLASH_Sector_3;
else if(addr<ADDR_FLASH_SECTOR_5)return FLASH_Sector_4;
else if(addr<ADDR_FLASH_SECTOR_6)return FLASH_Sector_5;
else if(addr<ADDR_FLASH_SECTOR_7)return FLASH_Sector_6;
else if(addr<ADDR_FLASH_SECTOR_8)return FLASH_Sector_7;
else if(addr<ADDR_FLASH_SECTOR_9)return FLASH_Sector_8;
else if(addr<ADDR_FLASH_SECTOR_10)return FLASH_Sector_9;
else if(addr<ADDR_FLASH_SECTOR_11)return FLASH_Sector_10;
return FLASH_Sector_11;
}

void STMFLASH_Write(u32 WriteAddr,u32 *pBuffer,u32 NumToWrite)
{
  FLASH_Status status = FLASH_COMPLETE;
u32 addrx=0;
u32 endaddr=0;
  if(WriteAddr<STM32_FLASH_BASE||WriteAddr%4)return; //非法地址
FLASH_Unlock(); //解锁
  FLASH_DataCacheCmd(DISABLE);//FLASH擦除期间,必须禁止数据缓存

addrx=WriteAddr; //写入的起始地址
endaddr=WriteAddr+NumToWrite*4; //写入的结束地址
if(addrx<0X1FFF0000) //只有主存储区,才需要执行擦除操作!!
{
while(addrx<endaddr) //扫清一切障碍.(对非FFFFFFFF的地方,先擦除)
{
if(STMFLASH_ReadWord(addrx)!=0XFFFFFFFF)//有非0XFFFFFFFF的地方,要擦除这个扇区
{
status=FLASH_EraseSector(STMFLASH_GetFlashSector(addrx),VoltageRange_3);//VCC=2.7~3.6V之间!!
if(status!=FLASH_COMPLETE)break; //发生错误了
}else addrx+=4;
}
}
if(status==FLASH_COMPLETE)
{
while(WriteAddr<endaddr)//写数据
{
if(FLASH_ProgramWord(WriteAddr,*pBuffer)!=FLASH_COMPLETE)//写入数据
{
break; //写入异常
}
WriteAddr+=4;
pBuffer++;
}
}
  FLASH_DataCacheCmd(ENABLE); //FLASH擦除结束,开启数据缓存
FLASH_Lock();//上锁
}

void STMFLASH_Read(u32 ReadAddr,u32 *pBuffer,u32 NumToRead)
{
u32 i;
for(i=0;i<NumToRead;i++)
{
pBuffer[i]=STMFLASH_ReadWord(ReadAddr);//读取4个字节.
ReadAddr+=4;//偏移4个字节.
}
}

void Test_Write(u32 WriteAddr,u32 WriteData)
{
  STMFLASH_Write(WriteAddr,&WriteData,1);

}