SPI_FLASH_Init();

    /* Get SPI Flash Device ID */DeviceID = SPI_FLASH_ReadDeviceID();

u32 SPI_FLASH_ReadDeviceID(void)
{u32 Temp = 0;/* Select the FLASH: Chip Select low */SPI_FLASH_CS_LOW();   //片选拉低。选中该设备/* Send "RDID " instruction */SPI_FLASH_SendByte(W25X_DeviceID);//先发送一个器ID，告诉它我们要读你的器件ID了（这是一个命令） 0XABSPI_FLASH_SendByte(Dummy_Byte);   　　//发送3个字节的空地址，25X16的地址是24位的，最后再发一个字节的话。就返回了一个字节的DEVICEID！

SPI_FLASH_SendByte(Dummy_Byte); SPI_FLASH_SendByte(Dummy_Byte);

/* Read a byte from the FLASH */Temp =SPI_FLASH_SendByte(Dummy_Byte); /* Deselect the FLASH: Chip Select high */SPI_FLASH_CS_HIGH(); returnTemp; }

    /* Get SPI Flash ID */FlashID = SPI_FLASH_ReadID();

/*******************************************************************************
* Function Name  : SPI_FLASH_ReadID
* Description    : Reads FLASH identification.
* Input          : None
* Output         : None
* Return         : FLASH identification
*******************************************************************************/
u32 SPI_FLASH_ReadID(void)
{u32 Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;/* Select the FLASH: Chip Select low */SPI_FLASH_CS_LOW();/* Send "RDID " instruction */SPI_FLASH_SendByte(W25X_JedecDeviceID); 　　//发送9F过去，将返回一个字节的ID（M7-M0）然后再返回来连个字节的deviceID (ID15-ID8/ID7-ID0)/* Read a byte from the FLASH */Temp0 = SPI_FLASH_SendByte(Dummy_Byte);    //读取M7-M0/* Read a byte from the FLASH */Temp1 = SPI_FLASH_SendByte(Dummy_Byte);    //读取ID15-ID8/* Read a byte from the FLASH */Temp2 = SPI_FLASH_SendByte(Dummy_Byte);　　 //读取ID7-ID0

/* Deselect the FLASH: Chip Select high */ SPI_FLASH_CS_HIGH(); Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2; return Temp; }   //数据组合