F4内部flash读出全部为0

我根据官方例程修改的，测试时全部写入20，但读出来为0，应该是写入进去了。查了几遍没查到错误，麻烦帮我看一眼。

void FLASH_Eraser()
{
/* Clear pending flags (if any) */
FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |
FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);

/* Get the number of the start and end sectors */
StartSector = GetSector(FLASH_USER_START_ADDR);
EndSector = GetSector(FLASH_USER_END_ADDR);

for (SectorCounter = StartSector; SectorCounter < EndSector; SectorCounter += 8)
{
/* Device voltage range supposed to be [2.7V to 3.6V], the opera tion will
be done by word */
if (FLASH_EraseSector(SectorCounter, VoltageRange_3) != FLASH_COMPLETE)
{
/* Error occurred while sector erase.
User can add here some code to deal with this error */
while (1);
}
}
}


void FLASH_Write(aCm *Buf)
{
tPriint32 Value=20;
// float * Ptr=(float*)Buf;

FLASH_Unlock();
FLASH_Eraser();
Address = FLASH_USER_START_ADDR;


while (Address < FLASH_USER_END_ADDR)
{

if (FLASH_ProgramWord(Address,Value) == FLASH_COMPLETE)
{
Address = Address + 4;
}
else
{
while (1);
}
}
FLASH_Lock();
}



tPriint32 data32=5；
void FLASH_Read(aCm *Buf)
{
tPriint32 *Ptr=(tPriint32*)Buf;
Address = FLASH_USER_START_ADDR;

while (Address < FLASH_USER_END_ADDR)
{
data32 = *(__IO uint32_t*)Address;
Address = Address + 4;
}
}

程序写入时没有停在while（1）处，说明已经写入进去了，但不知道为什么读出来是0