STM32---SPI通信的总结(库函数操作)
参考代码：
1 void SPI_GPIO_Init(void) 2 { 3 GPIO_InitTypeDef GPIO_InitStructure; 4 SPI_InitTypeDef SPI_InitStructure; 5 6 NVIC_InitTypeDef NVIC_InitStructure; 7 8 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );//PORTB时钟使能 9 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE );//SPI2时钟使能 10 11 /* DMA1 clock enable */ 12 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, DISABLE); 13 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); 14 15 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; 16 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //PB13/14/15复用推挽输出 17 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 18 GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB 19 20 GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15); //PB13/14/15上拉 21 22 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 23 SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式:设置为主SPI 24 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 25 SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //串行同步时钟的空闲状态为高电平 26 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 27 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 28 SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2; //定义波特率预分频的值:波特率预分频值为256 29 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始 30 SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式 31 SPI_Init(SPI2, &SPI_InitStructure); //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器 32 33 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 34 NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn; 35 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; 36 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; 37 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 38 NVIC_Init(&NVIC_InitStructure); 39 40 //SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, DISABLE); 41 SPI_Cmd(SPI2, ENABLE); 42 }