SPI初始化以及数据接收发送代码

//W25Q64_CS_H为拉高片选线电平
#define W25Q64_CS_H GPIO_SetBits(GPIOB,GPIO_Pin_14)
//W25Q64_CS_H为拉低片选线电平
#define W25Q64_CS_L GPIO_ResetBits(GPIOB,GPIO_Pin_14)


//SPI1初始化函数
void SPI1_Init(void)
{
	//1.开启时钟线
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);
	
	
	//2.初始化相关GPIO引脚
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	
	
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
	GPIO_Init(GPIOB,&GPIO_InitStructure);
	W25Q64_CS_H;//初始化完片选线引脚后就将其拉高
	
	//3.引脚重映射
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
	
	//4.配置SPI
	SPI_InitTypeDef SPI_InitStruct;
	SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;//2分频
	SPI_InitStruct.SPI_CPHA = SPI_CPHA_2Edge;//从第二个边沿开始捕获
	SPI_InitStruct.SPI_CPOL = SPI_CPOL_High;//时钟线初始电平状态为高电平
	SPI_InitStruct.SPI_CRCPolynomial = 0X0007;//这里我们不需要CRC，故设置为此值
	SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;//数据大小为8位
	SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//全双工通信
	SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;//高位先发
	SPI_InitStruct.SPI_Mode = SPI_Mode_Master;//主机模式
	SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;//软件控制NSS
	SPI_Init(SPI1, &SPI_InitStruct);

	//5.使能SPI
	SPI_Cmd(SPI1, ENABLE);
	
}


//SPI1数据收发函数
u8 SPI1_TransferData(u8 data)
{
	//当发送缓冲区为空时再发送数据
	while(RESET == SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE));
	SPI_I2S_SendData(SPI1,data);
	
	//当接收缓冲区不为空时再接收数据
	while(RESET == SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE));
	return SPI_I2S_ReceiveData(SPI1)&0xFF;
	
}