How to dynamically configure SPI baudrate？

fedora — Wed, 10 Dec 2025 12:05:31 GMT

Hi Team:

I'm using S32K144 and configure the baudrate of spi2 to 100K through PE tools（refer to the attached image）, I want to dynamically configure the speed of spi2 to 50K/20K/10K/5K during the device running.

The following is the test code:

//***********************************************

uint32_t baud2;
status_t ret_sts;

lpspi_master_config_t spiConfig1;

spiConfig1.bitsPerSec = 10000; //10Kbps baudrate
spiConfig1.whichPcs = LPSPI_PCS2;
spiConfig1.pcsPolarity = LPSPI_ACTIVE_LOW;
spiConfig1.isPcsContinuous = false;
spiConfig1.bitcount = 16;
spiConfig1.clkPhase = LPSPI_CLOCK_PHASE_1ST_EDGE;
spiConfig1.clkPolarity = LPSPI_SCK_ACTIVE_HIGH;
spiConfig1.lsbFirst= false;
spiConfig1.transferType = LPSPI_USING_INTERRUPTS;

ret_sts = LPSPI_DRV_MasterConfigureBus(LPSPICOM2, (lpspi_master_config_t *)&spiConfig1, &baud2);
printf("ret_sts = %d,baud2=%d\r\n",ret_sts,baud2);

//****************************************************

After running, printf output: ret_sts = 1,baud2=0

so LPSPI_DRV_MasterConfigureBus() return STATUS_ERROR, trace into it and find the STATUS_ERROR is caused by the following code:

//****************************************************

if ((spiConfig->bitcount < 8U) || (spiConfig->bitcount > 4096U))
{

printf("spi bitcount=%d\r\n",spiConfig->bitcount);
return STATUS_ERROR;
}

//****************************************************

Then output spi bitcount=0 , but the actual value of bitcount should be equal to 16.

May I ask where my method went wrong?

How to achieve dynamic configuration of SPI baudrate?

Thank you for your suggestion.

Best regards,

Fed

Re: How to dynamically configure SPI baudrate？

davidtosenovjan — Wed, 10 Dec 2025 16:05:20 GMT

Could you specify used RTD and example code?

Re: How to dynamically configure SPI baudrate？

fedora — Wed, 10 Dec 2025 16:54:01 GMT

Thanks !

I don't know what's the RTD.

The requirement is that when the device is activated, the speed of SPI can be 100k, but when the device is in sleep mode, the speed of SPI can only be 10k or even lower. Therefore, it is necessary to dynamically change the SPI speed.

Thanks and regards,

Fed

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How to dynamically configure SPI baudrate？

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Re: How to dynamically configure SPI baudrate？