LPSPI on FRDMKEA16Z works only for a few seconds

attiliorossi321 — Sat, 03 Oct 2020 00:57:22 GMT

Hi guy.

I'm new about the LPSPI driver.

I'm using a freedom board based up on KEA16Z. I find this kind of SPI port rather difficult. I got some example code to understand this driver, but it'doesn't work jet properly.

I post this code hoping someone can explain why it doesn't work.

The problem is that I can see the tx output data on mosi and the signal clock too on SCKpin

But this happen only for for 8 times.

Infact I call the function every 2 second, and I'd like to see the impulse train just forever every 2 second.

But after 8 transmission the clock pin goes high and the sistem is locked, of course.

Here is the init code, below the call.

void LSPI_Init(void)

{

PCC->CLKCFG[PCC_LPSPI0_INDEX] |= PCC_CLKCFG_CGC_MASK; // PCC->CLKCFG[PCC_PORTE_INDEX] |= PCC_CLKCFG_CGC_MASK; PORTE->PCR[0] = PORT_PCR_MUX(2); //

PORTE->PCR[1] = PORT_PCR_MUX(2); //

PORTE->PCR[2] = PORT_PCR_MUX(2); //

LPSPI0->CR = 0x00000000; /* Disable module for configuration */

LPSPI0->IER = 0x00000000; /* Interrupts not used */

LPSPI0->DER = 0x00000000; /* DMA not used */

LPSPI0->CFGR0 = 0x00000000; /* Defaults: */

/* RDM0=0: rec'd data to FIFO as normal */

/* CIRFIFO=0; Circular FIFO is disabled */

/* HRSEL, HRPOL, HREN=0: Host request disabled */

LPSPI0->CFGR1 = 0x00000001; /* Configurations: master mode*/

/* PCSCFG=0: PCS[3:2] are enabled */

/* OUTCFG=0: Output data retains last value when CS negated */

/* PINCFG=0: SIN is input, SOUT is output */

/* MATCFG=0: Match disabled */

/* PCSPOL=0: PCS is active low */

/* NOSTALL=0: Stall if Tx FIFO empty or Rx FIFO full */

/* AUTOPCS=0: does not apply for master mode */

/* SAMPLE=0: input data sampled on SCK edge */

/* MASTER=1: Master mode */

LPSPI0->TCR = 0x53000008; /* Transmit cmd: PCS3, 16 bits, prescale func'l clk by 4, etc*/

/* CPOL=0: SCK inactive state is low */

/* CPHA=1: Change data on SCK lead'g, capture on trail'g edge*/

/* PRESCALE=2: Functional clock divided by 2 */

/* PCS=3: Transfer using PCS3 */

/* LSBF=0: Data is transfered MSB first */

/* BYSW=0: Byte swap disabled */

/* CONT, CONTC=0: Continuous transfer disabled */

/* RXMSK=0: Normal transfer: rx data stored in rx FIFO */

/* TXMSK=0: Normal transfer: data loaded from tx FIFO */

/* WIDTH=0: Single bit transfer */

/* FRAMESZ=15: # bits in frame = 15+1=16 */

LPSPI0->CCR = 0x0409080A; /* Clock dividers based on prescaled func'l clk of 100 nsec */

/* SCKPCS=4: SCK to PCS delay = 4+1 = 5 (500 nsec) */

/* PCSSCK=4: PCS to SCK delay = 9+1 = 10 (1 usec) */

/* DBT=8: Delay between Transfers = 8+2 = 10 (1 usec) */

/* SCKDIV=8: SCK divider =8+2 = 10 (1 usec: 1 MHz baud rate) */

LPSPI0->FCR = 0x00000001; /* RXWATER=0: Rx flags set when Rx FIFO >0 */

/* TXWATER=3: Tx flags set when Tx FIFO <= 3 */

LPSPI0->CR = 0x00000009; /* Enable module for operation */

/* DBGEN=1: module enabled in debug mode */

/* DOZEN=0: module enabled in Doze mode */

/* RST=0: Master logic not reset */

/* MEN=1: Module is enabled */

}

This every two seconds.

void TestSpi(void)

{

while((LPSPI0->SR & LPSPI_SR_TDF_MASK)>>LPSPI_SR_TDF_SHIFT==0);

LPSPI0->TDR = 0x12;

LPSPI0->SR |= LPSPI_SR_TDF_MASK;

}

Thanks in advance.

Attilio

Re: LPSPI on FRDMKEA16Z works only for a few seconds

diego_charles — Sat, 10 Oct 2020 00:43:59 GMT

Hi Attillo,

I have noticed that you are creating a master with using a polling method and the FRDM-KE16Z, is this correct?

Being that the case, I believe that taking a look at our SDK LPSPI demos will be worthwhile as a reference. For example lpspi_polling_b2b_transfer.

If you have any issues to download an SDK example, you may check this tutorial

MCU Tech Minutes | Importing an SDK Package into MCUXpresso IDE

This week we had an intense workload, and my reply had been delayed, my apologies!

Please let me know If I can help you further,

BR , Diego

Re: LPSPI on FRDMKEA16Z works only for a few seconds

attiliorossi321 — Mon, 12 Oct 2020 20:40:14 GMT

Hi Diego.

You are right. I have just seen the correct example about lpspi. It does a lot of things.

Don't be worry about your answer. It's just in time.

Many thanks.

Attilio

topic Re: LPSPI on FRDMKEA16Z works only for a few seconds in Kinetis Microcontrollers

LPSPI on FRDMKEA16Z works only for a few seconds

Re: LPSPI on FRDMKEA16Z works only for a few seconds

Re: LPSPI on FRDMKEA16Z works only for a few seconds