两个STM32之间进行SPI通信

采用双向通信模式，主机mosi—从机的mosi

主机从机配置一致。从机的片选引脚要设置成浮空输入。主机片选引脚设置成推挽输出

主机配置

void MB90092_CS_Configuration(void)

{

   GPIO_InitTypeDef MB90092_CS_GPIO_InitStructure;

 

   /* GPIOC Periph clock enable */

   RCC_APB2PeriphClockCmd(MB90092_GPIO_CLK, ENABLE);

 

   /* Configure PC1 in output pushpull mode */

   MB90092_CS_GPIO_InitStructure.GPIO_Pin  = MB90092_CS_OUT;

   MB90092_CS_GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

   MB90092_CS_GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出

   GPIO_Init(MB90092_GPIO, &MB90092_CS_GPIO_InitStructure);

}

 

void MB90092_CS(u8 sw)

{                                    

   if(sw == MB90092_CS_ENABLE)   

   GPIO_WriteBit(MB90092_GPIO, MB90092_CS_OUT , Bit_RESET);

   else

   GPIO_WriteBit(MB90092_GPIO, MB90092_CS_OUT,Bit_SET);

}

 

/**************************************************************/

void RCC_MB90092_SPI_Configuration(void)

{

   RCC_APB2PeriphClockCmd(MB90092_GPIO_CLK |RCC_APB2Periph_AFIO, ENABLE);

   RCC_APB2PeriphClockCmd(MB90092_CLK,ENABLE);

}

 

 

void GPIO_MB90092_SPI_Configuration(void)

{

   GPIO_InitTypeDef MB90092_GPIO_InitStructure;

 

   /* Configure SPIy pins: SCK and MOSI ---------------------------------*/

   MB90092_GPIO_InitStructure.GPIO_Pin = MB90092_SCK_SPI_SCK |MB90092_SIN_SPI_MOSI ;

    MB90092_GPIO_InitStructure.GPIO_Speed =GPIO_Speed_2MHz;

   MB90092_GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

   GPIO_Init(MB90092_GPIO, &MB90092_GPIO_InitStructure);

 

//   MB90092_GPIO_InitStructure.GPIO_Pin = MB90092_SIN_SPI1_MISO;

//   MB90092_GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

//   GPIO_Init(MB90092_GPIO, &MB90092_GPIO_InitStructure);

}

 

 

void MB90092_SPI_Configuration(void)

{

   SPI_InitTypeDef MB90092_SPI_InitStructure;

 

   SPI_Cmd(MB90092_SPI, DISABLE);  //必须先禁能,才能改变MODE

 

   //MB90092_SPI_InitStructure.SPI_Direction =SPI_Direction_2Lines_FullDuplex;//SPI_Direction_1Line_Tx;SPI_Direction_1Line_Tx       //单线双向模式：只发模式,8bit

   MB90092_SPI_InitStructure.SPI_Direction =SPI_Direction_2Lines_FullDuplex;

         MB90092_SPI_InitStructure.SPI_Mode= SPI_Mode_Master;

   MB90092_SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

   MB90092_SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;//数据在clk的下降沿锁定

   MB90092_SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

   MB90092_SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

   MB90092_SPI_InitStructure.SPI_BaudRatePrescaler =SPI_BaudRatePrescaler_256;

   MB90092_SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;

   MB90092_SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(MB90092_SPI,&MB90092_SPI_InitStructure);

 

   //使能

   SPI_Cmd(MB90092_SPI, ENABLE);

}

 

//初始化与MB90092、Encode相连接的SPI口

void MB90092_SPI_Initialize(void)

{   

   MB90092_CS_Configuration();              //片选管脚配置

   RCC_MB90092_SPI_Configuration();  //系统时钟配置函数  

   GPIO_MB90092_SPI_Configuration(); //GPIO配置函数

   MB90092_SPI_Configuration();      //SPI配置函数

}

 

从机配置

void SPI _Init(void)

{

 SPI_InitTypeDef SPI_InitStructure;

 GPIO_InitTypeDef GPIO_InitStructure;

 

  /*Enable SPI1 and GPIO clocks */

 /*!< SPI_FLASH_SPI_CS_GPIO, SPI_FLASH_SPI_MOSI_GPIO,

      SPI_FLASH_SPI_MISO_GPIO, SPI_FLASH_SPI_DETECT_GPIO

      and SPI_FLASH_SPI_SCK_GPIO Periph clock enable */

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOD,ENABLE);

 

 /*!< SPI_FLASH_SPI Periph clock enable */

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

 

 

 /*!< Configure SPI_FLASH_SPI pins: SCK */

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

 GPIO_Init(GPIOA, &GPIO_InitStructure);

 

 /*!< Configure SPI_FLASH_SPI pins: MISO */

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;

 GPIO_Init(GPIOA, &GPIO_InitStructure);

 

 /*!< Configure SPI_FLASH_SPI pins: MOSI */

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;

 GPIO_Init(GPIOA, &GPIO_InitStructure);

 

 /*!< Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin */

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

 GPIO_Init(GPIOA, &GPIO_InitStructure);

 

  /*Deselect the FLASH: Chip Select high */

// SPI_FLASH_CS_HIGH();

 

  /*SPI1 configuration */

  //W25X16: data input on the DIO pin is sampled on the rising edge of the CLK.

  //Data on the DO and DIO pins are clocked out on the falling edge of CLK.

 //SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;

 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

 SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;

 SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

 SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

 //SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;

 SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

 SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

 SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;

 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;

 SPI_InitStructure.SPI_CRCPolynomial = 7;

 SPI_Init(SPI1, &SPI_InitStructure);

 

  /*Enable SPI1  */

 SPI_Cmd(SPI1, ENABLE);

}