STM32F4调用STMFLASH_Write总是写入失败

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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
			{   
				FLASH_ClearFlag( FLASH_FLAG_EOP |  FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);
				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
}