frdm-kl43z simple spi

alexeyusoltsev — Mon, 13 Feb 2017 13:21:53 GMT

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?

Re: frdm-kl43z simple spi

alexeyusoltsev — Wed, 15 Feb 2017 15:39:55 GMT

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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frdm-kl43z simple spi

Re: frdm-kl43z simple spi