配置代码如下：
void SPI23_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); //使能GPIOB时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE); //使能SPI3时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //SCK
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //上拉
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //MISO
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //上拉
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //MOSI
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //上拉
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_SPI3); //PC10复用为 SPI3
GPIO_PinAFConfig(GPIOC,GPIO_PinSource12,GPIO_AF_SPI3); //PC11复用为 SPI3
GPIO_PinAFConfig(GPIOC,GPIO_PinSource13,GPIO_AF_SPI3); //PC12复用为 SPI3
//SPI口初始化
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式:设置为主SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //设置SPI的数据大小:SPI发送接收8位帧结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //串行同步时钟的空闲状态为高电平
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //串行同步时钟的第二个跳变沿（上升或下降）数据被采样
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;//定义波特率预分频的值:波特率预分频值为256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB; //指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 0; //CRC值计算的多项式
SPI_Init(SPI3, &SPI_InitStructure); //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器
SPI_Cmd(SPI3, ENABLE); //使能SPI外设
SPI3_ReadWriteByte(0xff); //启动传输
}
u8 SPI3_ReadWriteByte(u8 writeData)
{
u8 waitnum=0,i=0;
while (SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_TXE) == RESET)//等待发送区空
{
waitnum++;
if(waitnum>200) return 0;
}
SPI_I2S_SendData(SPI3, writeData); //通过外设SPI3发送一个字节
waitnum=0;
while (SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_RXNE) == RESET)//等待一个字节接收完
{
waitnum++;
if(waitnum>200)return 0;
}
return SPI_I2S_ReceiveData(SPI3); //返回SPI3接收的数据
}
