2019年10月17日 | STM32 3个硬件SPI的使用

硬件平台：STM32F103

SPI1初始化过程

static OS_EVENT *spi1_sem_event;

static void SPI1SemInit(void)

{

    spi1_sem_event = OSSemCreate(1);

}

extern void SPI1SemGet(void)

{

    uint8_t err;

    OSSemPend(spi1_sem_event, 0, &err);

}

extern void SPI1SemPut(void)

{

    OSSemPost(spi1_sem_event);

}

static void Spi1_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 */

    /*!< SPI_FLASH_SPI Periph clock enable */

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    /*!< AFIO Periph clock enable */

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    /*!< Configure SPI_FLASH_SPI pins: SCK */

    GPIO_InitStructure.GPIO_Pin = PIN_SPI1_SCLK;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init(PORT_SPI1_SCLK, &GPIO_InitStructure);

    /*!< Configure SPI_FLASH_SPI pins: MISO */

    GPIO_InitStructure.GPIO_Pin = PIN_SPI1_MISO;

    GPIO_Init(PORT_SPI1_MISO, &GPIO_InitStructure);

    /*!< Configure SPI_FLASH_SPI pins: MOSI */

    GPIO_InitStructure.GPIO_Pin = PIN_SPI1_MOSI;

    GPIO_Init(PORT_SPI1_MOSI, &GPIO_InitStructure);

    /* 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_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

#if 0

    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

#else

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;      //时钟悬空低

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;    //数据捕获于第1个时钟沿

#endif

    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_2;//定义波特率预分频的值:波特率预分频值为2

    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

    SPI_InitStructure.SPI_CRCPolynomial = 7;//CRC值计算的多项式

    SPI_Init(SPI1, &SPI_InitStructure);

    /* Enable SPI1  */

    SPI_Cmd(SPI1, ENABLE);

    SPI1SemInit();

}

extern void SPI1_SetSpeed(u8 SpeedSet)

{

    SPI_InitTypeDef SPI_InitStructure;

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    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;

    //如果速度设置输入0，则低速模式，非0则高速模式

    if(SpeedSet == 1)

    {

        SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;

    }

    else

    {

        SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;

    }

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPI1, &SPI_InitStructure);

}

extern void spi1WriteData(Uchar *buf,Uint len)

{

    for (; len ; len--,buf++)

    {

        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

        SPI_I2S_SendData(SPI1, *buf);

        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

        SPI_I2S_ReceiveData(SPI1);

    }

}

extern u8 SPI1_Swap_DataMSB(u8 byte)

{

    u8 retry=0;

    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) //检查指定的SPI标志位设置与否:发送缓存空标志位

    {

        retry++;

        if(retry>200)return 0;

    }

    SPI_I2S_SendData(SPI1, byte); //通过外设SPIx发送一个数据

    retry=0;

    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET) //检查指定的SPI标志位设置与否:接受缓存非空标志位

    {

        retry++;

        if(retry>200)return 0;

    }

    return SPI_I2S_ReceiveData(SPI1); //返回通过SPIx最近接收的数据

}

SPI2初始化过程

static OS_EVENT *spi2_sem_event;

static void SPI2SemInit(void)

{

    spi2_sem_event = OSSemCreate(1);

}

extern void SPI2SemGet(void)

{

    uint8_t err;

    OSSemPend(spi2_sem_event, 0, &err);

}

extern void SPI2SemPut(void)

{

    OSSemPost(spi2_sem_event);

}

extern void Spi2_Init(void)

{

    SPI_InitTypeDef  SPI_InitStructure;

    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

    /*!< AFIO Periph clock enable */

    //RCC_APB2PeriphClockCmd(RCC_APB1Periph_AFIO, ENABLE);

    GPIO_InitStructure.GPIO_Pin = PIN_SPI2_SCLK;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init(PORT_SPI2_SCLK, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = PIN_SPI2_MISO;

    GPIO_Init(PORT_SPI2_MISO, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = PIN_SPI2_MOSI;

    GPIO_Init(PORT_SPI2_MOSI, &GPIO_InitStructure);

    /* SPI2 configuration */

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

#if 1

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

#else

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;      //时钟悬空低

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;        //数据捕获于第1个时钟沿

#endif

    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPI2, &SPI_InitStructure);

    /* Enable SPI2  */

    SPI_Cmd(SPI2, ENABLE);

    SPI2SemInit();

}

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

* Function Name  : SPI_SetSpeed

* Description    : SPI设置速度为高速

* Input          : u8 SpeedSet

*                  如果速度设置输入0，则低速模式，非0则高速模式

*                  SPI_SPEED_HIGH   1

*                  SPI_SPEED_LOW    0

* Output         : None

* Return         : None

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

void SPI2_SetSpeed(u8 SpeedSet)

{

    SPI_InitTypeDef SPI_InitStructure;

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    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;

    //如果速度设置输入0，则低速模式，非0则高速模式

    if(SpeedSet == 1)

    {

        SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;

    }

    else

    {

        SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;

    }

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPI2, &SPI_InitStructure);

}

extern void spi2WriteData(Uchar *buf,Uint len)

{

    for (; len ; len--,buf++)

    {

        while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);

        SPI_I2S_SendData(SPI2, *buf);

        while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);

        SPI_I2S_ReceiveData(SPI2);

    }

}

extern u8 SPI2_Swap_DataMSB(u8 byte)

{

  /* Loop while DR register in not emplty */

  while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);

  /* Send byte through the SPI1 peripheral */

  SPI_I2S_SendData(SPI2, byte);

  /* Wait to receive a byte */

  while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);

  /* Return the byte read from the SPI bus */

  return SPI_I2S_ReceiveData(SPI2);

}

SPI3初始化过程

static OS_EVENT *spi3_sem_event;

static void SPI3SemInit(void)

{

    spi3_sem_event = OSSemCreate(1);

}

extern void SPI3SemGet(void)

{

    uint8_t err;

    OSSemPend(spi3_sem_event, 0, &err);

}

extern void SPI3SemPut(void)

{

    OSSemPost(spi3_sem_event);

}

static void Spi3_Init(void)

{

    SPI_InitTypeDef  SPI_InitStructure;

    GPIO_InitTypeDef GPIO_InitStructure;

    /* Enable SPI1 and GPIO clocks */