frdm-kl43z simple spi

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frdm-kl43z simple spi

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alexeyusoltsev
Contributor IV

 Hi!

I want to test ezport on my board via frdm-kl43. I've tried simple SPI trasnmission and failed.

The code:

  ini_spi();
  SPI1_S & (SPI_S_SPRF_MASK); //initial clear of SPRF bit
  while(1)
  {
      OSA_TimeDelay(100);
      GPIO_DRV_ClearPinOutput(CS); //CS enable
      SPI1_DL=0x55;
      while (!(SPI1_S & (SPI_S_SPRF_MASK))); //wait SPRF to be setted up
      GPIO_DRV_SetPinOutput(CS); //CS desable
  }

 And logic analyzer picture is attached. Chip select goes high before transmit is complete.( SPRF sets)

What is the root of my problem?

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alexeyusoltsev
Contributor IV

 ok,i have done with it.

With the interrupt it worked out:

  INT_SYS_InstallHandler(SPI1_IRQn,spi_interrupt_hndler);
  NVIC_EnableIRQ(SPI1_IRQn);
  INT_SYS_EnableIRQGlobal();
  SPI1_S & (SPI_S_SPRF_MASK);
  while(1)
  {
      OSA_TimeDelay(1000);
      GPIO_DRV_ClearPinOutput(CS); //CS enable
      spi_cnt=1; //2 symbols to sent
      if(SPI1_S&(1<<SPI_S_SPTEF_SHIFT )) SPI1_DL=0x05; //read status reg
      if(SPI1_S&(1<<SPI_S_SPTEF_SHIFT )) SPI1_DL=0x00; //here will be status reg answer

}

and the interrupt code:

void spi_interrupt_hndler(void)
{
    SPI1_S&SPI_S_SPRF_MASK;
    uint8_t a=SPI1_DL;
    if(spi_cnt)
    {
        --spi_cnt;
    }
    else
    {
        GPIO_DRV_SetPinOutput(CS);
    }
}

Note: for ezport to work you have to reset the CPU and push CS down before un-reset the target CPU. Than read Status register.

I hope it will help anyone.

 Best regards, Alexey.

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alexeyusoltsev
Contributor IV

 ok,i have done with it.

With the interrupt it worked out:

  INT_SYS_InstallHandler(SPI1_IRQn,spi_interrupt_hndler);
  NVIC_EnableIRQ(SPI1_IRQn);
  INT_SYS_EnableIRQGlobal();
  SPI1_S & (SPI_S_SPRF_MASK);
  while(1)
  {
      OSA_TimeDelay(1000);
      GPIO_DRV_ClearPinOutput(CS); //CS enable
      spi_cnt=1; //2 symbols to sent
      if(SPI1_S&(1<<SPI_S_SPTEF_SHIFT )) SPI1_DL=0x05; //read status reg
      if(SPI1_S&(1<<SPI_S_SPTEF_SHIFT )) SPI1_DL=0x00; //here will be status reg answer

}

and the interrupt code:

void spi_interrupt_hndler(void)
{
    SPI1_S&SPI_S_SPRF_MASK;
    uint8_t a=SPI1_DL;
    if(spi_cnt)
    {
        --spi_cnt;
    }
    else
    {
        GPIO_DRV_SetPinOutput(CS);
    }
}

Note: for ezport to work you have to reset the CPU and push CS down before un-reset the target CPU. Than read Status register.

I hope it will help anyone.

 Best regards, Alexey.

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