求助 MX25L1605 读写操作

在C8051F340 MCU 下SPI读写 MA25L1605 操作

请教哪里错问题了 读写都不行 各位老兄帮下忙
//往SPI口写一个字节的数据
void SPI_WriteByte(uchar Data)
{
SPI0DAT = Data;
while(!SPIF);
SPIF = FALSE;
}

//从SPI口读一个字节的数据
uchar SPI_ReadByte()
{
SPI0DAT = 0x00;
while (!SPIF);
SPIF = FALSE;
return (SPI0DAT);
}

// 按地址写数据
void Wtire_Page(ulong ADDR ,uchar WDATA)
NSSMD0 = FALSE;

SPI_WriteByte(0x06); //写使能
Delay(1);
SPI_WriteByte(0x01); //写操作命令
SPI_WriteByte( (ADDR & 0x00FF0000) >> 16);
SPI_WriteByte( (ADDR & 0x0000FF00) >> 8);
SPI_WriteByte( (ADDR & 0x000000FF));

SPI_WriteByte(WDATA);
NSSMD0 =TRUE;
}


//按地址读数据
uchar Read_Page(ulong ADDR)
{
uchar RDATA=0;

NSSMD0 = FALSE;
SPI_WriteByte(0x03);
SPI_WriteByte( (ADDR & 0x00FF0000) >> 16); // send out the address, high byte, middle byte, then low byte
SPI_WriteByte( (ADDR & 0x0000FF00) >> 8);
SPI_WriteByte( (ADDR & 0x000000FF));


RDATA=SPI_ReadByte();
return RDATA;
NSSMD0 =TRUE;

}

//读取ID
void Read_ID()
{
uchar rnum1=0,rnum2=0,rnum3=0;
NSSMD0 = FALSE; ///选中FLASH

SPI_WriteByte(0X9f); //读ID 命令
rnum1= SPI_ReadByte();
rnum2= SPI_ReadByte();
rnum3= SPI_ReadByte();
if(rnum1==0xc2) //是否是ID号
{
P3=0Xff; //硬件指示是否成功。
P2=0Xff;
}
NSSMD0 = TRUE;
}