相关程序
初始化
SPI初始化- void SPI2_Init(void)
- {
- SPI_InitTypeDef SPI_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
- /****Initial SPI2******************/
-
- /* Enable SPI2 and GPIOB clocks */
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
- /* Configure SPI2 pins: NSS, SCK, MISO and MOSI */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOB, &GPIO_InitStructure);
-
- /* SPI2 configuration */
- SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //SPI1设置为两线全双工
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI2为主模式
- SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //SPI发送接收8位帧结构
- SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //串行时钟在不操作时,时钟为低电平
- SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //第一个时钟沿开始采样数据
- SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由软件(使用SSI位)管理
- SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //定义波特率预分频的值:波特率预分频值为8
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //数据传输从MSB位开始
- SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式
- SPI_Init(SPI2, &SPI_InitStructure);
- /* Enable SPI2 */
- SPI_Cmd(SPI2, ENABLE);
- }
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