topic Re: K82 SPI0 problem in Kinetis Microcontrollers

K82 SPI0 problem

gokulnath12345 — Wed, 26 Sep 2018 14:53:33 GMT

I used the following code for initializing my SPI0 in FRDM K82 board,

But I do not see clock and MOSI data through scope and data except chip select, Can you please help me.

void spiinit()
{
//Clock settings
SIM->SCGC5 |= SIM_SCGC5_PORTD_MASK; //
SIM->SCGC6 |= SIM_SCGC6_SPI0_MASK;
//Port Settings
PORTD->PCR[0] |= PORT_PCR_MUX(2); // CS
PORTD->PCR[1] |= PORT_PCR_MUX(2); // SCK
PORTD->PCR[2] |= PORT_PCR_MUX(2); // SOUT
PORTD->PCR[3] |= PORT_PCR_MUX(2); // SIN

SPI0->MCR =0;

SPI0->CTAR[0] = 0;

//-------------------------------------
SPI0->MCR |= SPI_MCR_MSTR_MASK;
SPI0->MCR |= SPI_MCR_DCONF(0)|(0 << SPI_MCR_FRZ_SHIFT);
SPI0->MCR |= SPI_MCR_PCSIS(1) | SPI_MCR_MDIS(0); // Module enable
SPI0->MCR |= (1 << SPI_MCR_DIS_TXF_SHIFT)| (1 << SPI_MCR_DIS_RXF_SHIFT);
SPI0->MCR |= (1 << SPI_MCR_HALT_SHIFT); // stop transfer
PRINTF("SPI0->MCR=%x\n",SPI0->MCR);
SPI0->CTAR[0] |= (0 << SPI_CTAR_DBR_SHIFT);
SPI0->CTAR[0] |= SPI_CTAR_FMSZ(15); // frame size 16
SPI0->CTAR[0] |= (0 << SPI_CTAR_CPOL_SHIFT);// CPOL=0;
SPI0->CTAR[0] |= (0 << SPI_CTAR_CPHA_SHIFT);// CPHA=0;
SPI0->CTAR[0] |= (0 << SPI_CTAR_LSBFE_SHIFT);//MSB first
SPI0->CTAR[0] |= SPI_CTAR_PCSSCK(0) ;
SPI0->CTAR[0] |= SPI_CTAR_CSSCK(1) ;
SPI0->CTAR[0] |= SPI_CTAR_ASC(0) ;
SPI0->CTAR[0] |= SPI_CTAR_PDT(3) ;
SPI0->CTAR[0] |= SPI_CTAR_DT(5) ;
SPI0->CTAR[0] |= SPI_CTAR_BR(1);
PRINTF("SPI0->CTAR[0]=%x\n",SPI0->CTAR[0]);
SPI0->SR = SPI_SR_TFFF(1); // cleared by writing 1 after module enable

SPI0->RSER = SPI_RSER_TCF_RE(1)|SPI_RSER_EOQF_RE(1);

}

int main(void)

{

BOARD_InitPins();
BOARD_BootClockRUN();
BOARD_InitDebugConsole();

spiinit();

for(;;) { /* Infinite loop to avoid leaving the main function */
__asm("NOP"); /* something to use as a breakpoint stop while looping */

}

Please help if there is any mistake.

Thanks

Gokul.

Re: K82 SPI0 problem

rasityilmaz — Wed, 26 Sep 2018 17:13:03 GMT

Please add this part inside for loop :

And SPI_MCR_MDIS(0); ı am not sure but as ı remember after init make module active

I hope it will work..

Re: K82 SPI0 problem

Robin_Shen — Thu, 27 Sep 2018 08:47:41 GMT

Hi Gokulnath Kasinathan,

Seems that you have download the MCUXpresso SDK. Why not direct refer the dpsi examples in it's folder?

For example: You can modify the SPI0 pins in BOARD_InitPins function of dspi_polling_b2b_transfer_master example. Check if these pins are able to output waveform.

Best Regards,

Robin

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