STM8L151 使用硬件SPI驱动W25Q16 Flash

void SPI_FLASH_Init(void)
{ 
	//SPI_CLOCK:PB5, SPI_MOSI: PB6, SPI_MISO: PB7
	GPIO_Init(GPIOB, GPIO_Pin_5, GPIO_Mode_Out_PP_High_Fast);
	GPIO_Init(GPIOB, GPIO_Pin_6, GPIO_Mode_Out_PP_High_Fast);
	//主机模式，配置为输入 该设置很关键
	GPIO_Init(GPIOB, GPIO_Pin_7, GPIO_Mode_In_PU_No_IT);
  	/* 初始化SPI */
	SPI_Init(SPI1, SPI_FirstBit_MSB, SPI_BaudRatePrescaler_4, SPI_Mode_Master,		 SPI_CPOL_High, SPI_CPHA_2Edge, 		SPI_Direction_2Lines_FullDuplex, SPI_NSS_Soft, 0x07);
	
	SPI_Cmd(SPI1, ENABLE);	/* 使能SPI */
	
	/* 配置CS管脚 */
	GPIO_Init(SPI_CS , SPI_Pin_CS, GPIO_Mode_Out_PP_High_Fast);
	GPIO_WriteBit(SPI_CS, SPI_Pin_CS, SET);		/* 拉高不使能外部SPI设备 */
}

uint8_t SPI_FLASH_SendByte(u8 byte)
{
  /* Loop while DR register in not emplty */
  while (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
  /* Send byte through the SPI1 peripheral */
  SPI_SendData(SPI1, byte);
  /* Wait to receive a byte */
  while (SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET);
  /* Return the byte read from the SPI bus */
  return SPI_ReceiveData(SPI1);	 
 }

uint16_t SPI_FLASH_ReadID(void)
{
	u16 Device_ID = 0;
	/* Select the FLASH: Chip Select low */
	SPI_FLASH_CS_LOW(); //拉低片选管脚电平，选中外设
	/* Send "RDID " instruction */
	SPI_FLASH_SendByte(0x90); //读取设备ID指令
	SPI_FLASH_SendByte(0X00);
	SPI_FLASH_SendByte(0X00);
	SPI_FLASH_SendByte(0X00);
	/* Read a byte from the FLASH */
	Device_ID = (SPI_FLASH_SendByte(Dummy_Byte)<<8);
	Device_ID |= SPI_FLASH_SendByte(Dummy_Byte);
	SPI_FLASH_CS_HIGH();//拉高片选管脚电平，
	return Device_ID;
}