STM32F207 - SPI2 Master

/* 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

GPIO_InitTypeDef GPIO_InitStructure;

SPI_InitTypeDef SPI_InitStructure;

static void SPI_Config(void);

void SPIx_IRQHANDLER(void);

uint8_t GetVar_NbrOfData(void);

uint8_t TxBuffer[];

__IO uint8_t Counter = 0x00;

__IO uint32_t TimeOut;

__IO uint8_t Tx_Idx = 0x00;

__IO uint8_t CmdStatus = 0x00;

__IO uint8_t NumberOfByte = 0x01;

int  TimeStep100ms = 100;

int  TimeStep200ms = 200;

int  TimeStep500ms = 500;

int  NextTime = 0;

void main (void)

{

/* SPI configuration ------------------------------------------------------*/

  SPI_Config();

  /* Initializes the SPI communication */

  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

  SPI_Init(SPIx, &SPI_InitStructure);

  /* The Data transfer is performed in the SPI interrupt routine */

  /* Enable the SPI peripheral */

  SPI_Cmd(SPIx, ENABLE);

  while (1)

  {

      STM_EVAL_LEDToggle(LED2);

      /* Enable the Tx buffer empty interrupt */

      SPI_I2S_ITConfig(SPIx, SPI_I2S_IT_TXE, ENABLE);

      /* Waiting the end of Data transfer */

      while (Tx_Idx < GetVar_NbrOfData())

      {

      }   

      delay(1000);

  }

}

void SPIx_IRQHANDLER(void)

{

  /* SPI in Master Tramitter mode--------------------------------------- */

  if (SPI_I2S_GetITStatus(SPIx, SPI_I2S_IT_TXE) == SET)

  {

    if (Tx_Idx < GetVar_NbrOfData())

    {

      /* Send Transaction data */

      SPI_I2S_SendData(SPIx, TxBuffer[Tx_Idx++]);

    }

    else

    {

      /* Disable the Tx buffer empty interrupt */

      SPI_I2S_ITConfig(SPIx, SPI_I2S_IT_TXE, DISABLE);

    }

  }

}

uint8_t GetVar_NbrOfData(void)

{

  return NumberOfByte;

}

static void SPI_Config(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

  NVIC_InitTypeDef NVIC_InitStructure;

  /* 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);

  /* 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_InitStructure.GPIO_Mode = GPIO_Mode_AF;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  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 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_Low;

  SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;

  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;

  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

  SPI_InitStructure.SPI_CRCPolynomial = 7;

  /* 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);

}