STM32F4 SPI通信自发自收使用经验

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本周调了一周的SPI通信，今日有了一些进展，通过自发自收实现了方案的验证。

SPI的配置函数如下

void SPI_Config(void){  GPIO_InitTypeDef GPIO_InitStructure;  NVIC_InitTypeDef NVIC_InitStructure;SPI_InitTypeDef  SPI_InitStructure;  /* Peripheral Clock Enable -------------------------------------------------*/  /* Enable the SPI clock */  SPIx_CLK_INIT(SPIx_CLK, ENABLE);    /* Enable GPIO clocks */  RCC_AHB1PeriphClockCmd(SPIx_SCK_GPIO_CLK | SPIx_MISO_GPIO_CLK | SPIx_MOSI_GPIO_CLK, ENABLE);  /* SPI GPIO Configuration --------------------------------------------------*/  /* Connect SPI pins to AF5 */    GPIO_PinAFConfig(SPIx_SCK_GPIO_PORT, SPIx_SCK_SOURCE, SPIx_SCK_AF);  GPIO_PinAFConfig(SPIx_MOSI_GPIO_PORT, SPIx_MOSI_SOURCE, SPIx_MOSI_AF);  GPIO_PinAFConfig(SPIx_MISO_GPIO_PORT, SPIx_MISO_SOURCE, SPIx_MISO_AF);  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;  /* SPI SCK pin configuration */  GPIO_InitStructure.GPIO_Pin = SPIx_SCK_PIN;  GPIO_Init(SPIx_SCK_GPIO_PORT, &GPIO_InitStructure);  /* SPI  MOSI pin configuration */  GPIO_InitStructure.GPIO_Pin =  SPIx_MOSI_PIN;  GPIO_Init(SPIx_MOSI_GPIO_PORT, &GPIO_InitStructure);  /* SPI  MISO pin configuration  */  GPIO_InitStructure.GPIO_Pin =  SPIx_MISO_PIN;  GPIO_Init(SPIx_MISO_GPIO_PORT,&GPIO_InitStructure);   /* SPI configuration -------------------------------------------------------*/  SPI_I2S_DeInit(SPIx);  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;  SPI_InitStructure.SPI_CRCPolynomial = 7;    SPI_Init(SPIx,&SPI_InitStructure);  SPI_Cmd(SPIx, ENABLE);  /* Configure the Priority Group to 1 bit */                  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);    /* Configure the SPI interrupt priority */  NVIC_InitStructure.NVIC_IRQChannel = SPIx_IRQn;  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  NVIC_Init(&NVIC_InitStructure);}

SPI.H 的头文件的宏定义

/* SPIx Communication boards Interface */#define SPIx                           SPI2#define SPIx_CLK                       RCC_APB1Periph_SPI2#define SPIx_CLK_INIT                  RCC_APB1PeriphClockCmd#define SPIx_IRQn                      SPI2_IRQn#define SPIx_IRQHANDLER                SPI2_IRQHandler#define SPIx_SCK_PIN                   GPIO_Pin_1#define SPIx_SCK_GPIO_PORT             GPIOI#define SPIx_SCK_GPIO_CLK              RCC_AHB1Periph_GPIOI#define SPIx_SCK_SOURCE                GPIO_PinSource1#define SPIx_SCK_AF                    GPIO_AF_SPI2#define SPIx_MISO_PIN                  GPIO_Pin_2#define SPIx_MISO_GPIO_PORT            GPIOI#define SPIx_MISO_GPIO_CLK             RCC_AHB1Periph_GPIOI#define SPIx_MISO_SOURCE               GPIO_PinSource2#define SPIx_MISO_AF                   GPIO_AF_SPI2#define SPIx_MOSI_PIN                  GPIO_Pin_3#define SPIx_MOSI_GPIO_PORT            GPIOI#define SPIx_MOSI_GPIO_CLK             RCC_AHB1Periph_GPIOI#define SPIx_MOSI_SOURCE               GPIO_PinSource3#define SPIx_MOSI_AF                   GPIO_AF_SPI2#define TXBUFFERSIZE   (countof(TxBuffer) - 1)#define RXBUFFERSIZE   TXBUFFERSIZE

注意两个地方：

SPI2的引脚如果被其他引脚复用，应关闭其相关设备。

MISO和MOSI两个引脚要关闭。

不建议打开SPI的接收中断。