SPI interruption problem

Posted on April 04, 2014 at 16:43

Hi all,

I

would like to know

if anyone has a problem when

enabling the Tx buffer empty interrupt. In fact, when i put SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE, ENABLE);  , the code coming after can't be executed

switch (USBButton)

    {

      /* BUTTON_USER button pressed */

     case 0x01:    

          SendMode=0x01;

          ReceveMode=0x00;

          CmdTransmitted = 0x01;

     break;

     .

     .

     .

}

if (CmdTransmitted != 0x00)

{    

    /* Enable the Tx buffer empty interrupt */

   SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE, ENABLE);    

            

    /* Transmission mode */

   if(SendMode==0x01)

    {    

    STM_EVAL_LEDOn(LED7);

   while(CmdStatus==0x00);

            

   while(Tx_Idx < DATA_SIZE);

   /* Waiting until TX FIFO is empty */

  while (SPI_GetTransmissionFIFOStatus(SPI1) != SPI_TransmissionFIFOStatus_Empty)

  {}

    

   /* Wait busy flag */

    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET)

  {}

 }

/*------SPI handler --------*/

void SPI1_IRQHandler(void)

{

    

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

  if (SPI_I2S_GetITStatus(SPI1, SPI_I2S_IT_TXE) == SET)

  {

   if (CmdStatus == 0x00)

   {

      SPI_SendData8(SPI1, CmdTransmitted);

      CmdStatus = 0x01;

       Tx_Idx=0x00;

        STM_EVAL_LEDOn(LED5);

   }

   else

   {

        if(SendMode)

        {  

          SPI_SendData8(SPI1, CommandRegister_Tx[Tx_Idx++]);

          STM_EVAL_LEDOn(LED3);

          if (Tx_Idx == 4)

          {

                STM_EVAL_LEDOn(LED10);

               /* Disable the Tx buffer empty interrupt */

              SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE, DISABLE);

          }

     } 

  }

}     

This code is for the master. In the slave side, i can receive what the master sends but it doesn't enter to if(SendMode==0x01). Any suggestion.

I hope that it's clear enough to understand the issue.