spi configuration related issue

RE: spi configuration related issue

akash naidu — Mon, 08 Apr 2019 06:14:00 GMT

check this spi configuration..

int spiInit(void){
  //Structure for SPI master configuration, initialized by default values.
  spi_master_config_t spi_instance =  SPI_MASTER_INIT_DEFAULT;
  
  spi_instance.SPI_Pin_SCK  = 12;	
  spi_instance.SPI_Pin_MOSI = 14;
  spi_instance.SPI_Pin_MISO = 13;
  spi_instance.SPI_Pin_SS   = 15;
  
  spi_instance.SPI_CONFIG_CPOL = SPI_CONFIG_CPOL_ActiveLow;
  spi_instance.SPI_CONFIG_CPHA = SPI_CONFIG_CPHA_Trailing;
  
  spi_instance.SPI_CONFIG_ORDER = SPI_CONFIG_ORDER_LsbFirst;
  spi_instance.SPI_Freq = SPI_FREQUENCY_FREQUENCY_M8; // 125 Hz.
  
  spi_instance.SPI_PriorityIRQ = NRF_APP_PRIORITY_HIGH;	//with softdevice enabled.
  
  
  //Initialize SPI master.
  uint32_t err_code = spi_master_open(SPI_MASTER_0, &spi_instance);// init the SPI0 Instance.
  if( err_code == NRF_ERROR_INVALID_STATE ){
    
    return 2;
  }
  else if( err_code == NRF_ERROR_NULL ){
    
    return 3;
  }
  else if( err_code == NRF_ERROR_NOT_SUPPORTED ){
    
    return 4;
  }
  else if(err_code != NRF_SUCCESS){
    return 0;
  }
  //else it is good to go now.
  
  //Register SPI master event handler.
  spi_master_evt_handler_reg( SPI_MASTER_0, spi_master_event_handler);
  return 1;
}

spi event code

void spi_master_event_handler(spi_master_evt_t spi_master_evt){
  switch(spi_master_evt.evt_type){
  case SPI_MASTER_EVT_TRANSFER_COMPLETED:
    // printf ("SPI_MASTER_EVT_TRANSFER_COMPLETED\r\n");
    //Transmission done.
    transmission_completed_spi = true;
    //rx_buffer must have received data now.
    break;
  default:
    // no implementation is required for now.
    break;
  }
}

for read/write spi API

spi_master_send_recv(SPI_MASTER_0, tx_buffer_spi, TX_RX_MSG_LENGTH, rx_buffer_spi, TX_RX_MSG_LENGTH);

i hope this could be helpful.

RE: spi configuration related issue

masterLee — Fri, 05 Apr 2019 12:40:07 GMT

Could you please share the solution since I am facing the same problem?? Thank you

RE: spi configuration related issue

akash naidu — Wed, 07 Nov 2018 07:40:19 GMT

Hi Martin,

I forgot to give reply.

My problem has been resolved since 2 months back.

Thanks for support.

Best Regards,

Akash.

RE: spi configuration related issue

Martin Lesund — Fri, 22 Jun 2018 12:29:56 GMT

Hi Akash,

Could you compare the MOSI with SCLK (as well as SS) for the STM32 and the nRF52 to see that they actually behave the same?

I think that will give you a good clue what is going on.

I want to confirm that the data sent out of the STM32 is exactly the same as the data sent out from nRF52. (but my hunch is that this is not the case)

RE: spi configuration related issue

akash naidu — Wed, 20 Jun 2018 11:34:38 GMT

My slave is supports SPI3(CPOL = 1,CPHA = 1) mode, and 14Mhz frequency.

below code is for STM32 master configuration..

  /* SPI1 parameter configuration*/
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_HIGH;
  hspi1.Init.CLKPhase = SPI_PHASE_2EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_LSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 10;

I have verified all signals(SCK,SS,MOSI) over C.R.O.I have been getting all signals properly.

static uint8_t m_tx_buf[] = {0x80,0x02}; /**< TX buffer. */

i am sending 2 bytes of data.

first byte is used to set as read mode in slave.

second byte is used to read the chip id of the slave.

RE: spi configuration related issue

Martin Lesund — Wed, 20 Jun 2018 09:42:37 GMT

[quote user="akash naidu"]is there any configuration required that changing shifting bit(MSB/LSB) and mode(0,1,2,3)?[/quote]

You change that in:

#define NRF_DRV_SPI_DEFAULT_CONFIG \
{ \
.sck_pin = NRF_DRV_SPI_PIN_NOT_USED, \
.mosi_pin = NRF_DRV_SPI_PIN_NOT_USED, \
.miso_pin = NRF_DRV_SPI_PIN_NOT_USED, \
.ss_pin = NRF_DRV_SPI_PIN_NOT_USED, \
.irq_priority = SPI_DEFAULT_CONFIG_IRQ_PRIORITY, \
.orc = 0xFF, \
.frequency = NRF_DRV_SPI_FREQ_8M, \
.mode = NRF_DRV_SPI_MODE_3, \
.bit_order = NRF_DRV_SPI_BIT_ORDER_LSB_FIRST, \
}

According to what the mode/freq. your slave requires.

What configurations did you set for the STM32 master?

Did you check every signal from master-slave? sclk,ss ....

What are you sending to the slave?

RE: spi configuration related issue

akash naidu — Wed, 20 Jun 2018 07:28:40 GMT

Hi Martin,

Thanks for your reply.

yes. I am using [nRF5_SDK_15.0\examples\peripheral\spi\] as a reference.

yes. I am using same pins which are defined in sdk_config.h(SS = 29,MISO = 28,MOSI = 4,SCK = 3), and i have connected the connections properly.

And i have verified the data(over MOSI pin) over C.R.O, where i am getting expecting data.

But i am not getting any data(if i probe on MISO pin) from slave device.

is there any configuration required that changing shifting bit(MSB/LSB) and mode(0,1,2,3)?

I am trying to read chip id of slave device, but i was not getting any response from device.

For same slave device, i worked on STM32 where it was working fine.

below code is for configuration settings.

#define NRF_DRV_SPI_DEFAULT_CONFIG \
{ \
.sck_pin = NRF_DRV_SPI_PIN_NOT_USED, \
.mosi_pin = NRF_DRV_SPI_PIN_NOT_USED, \
.miso_pin = NRF_DRV_SPI_PIN_NOT_USED, \
.ss_pin = NRF_DRV_SPI_PIN_NOT_USED, \
.irq_priority = SPI_DEFAULT_CONFIG_IRQ_PRIORITY, \
.orc = 0xFF, \
.frequency = NRF_DRV_SPI_FREQ_8M, \
.mode = NRF_DRV_SPI_MODE_3, \
.bit_order = NRF_DRV_SPI_BIT_ORDER_LSB_FIRST, \
}

nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
spi_config.ss_pin = SPI_SS_PIN;
spi_config.miso_pin = SPI_MISO_PIN;
spi_config.mosi_pin = SPI_MOSI_PIN;
spi_config.sck_pin = SPI_SCK_PIN;
APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL).

finally,i am not getting any response from slave device.

regards,

akash.

RE: spi configuration related issue

Martin Lesund — Tue, 19 Jun 2018 12:44:44 GMT

Hi Akash,

I assume that you are using the SPI example found in SDKv15 in folder [nRF5_SDK_15.0\examples\peripheral\spi\] as reference?

No it is not required to change anything on the low level.

I am interested if you have connected to the correct pins as the pins are defined in the sdk_config.h? (from the default unmodified example it should be the pins commented)

    nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
    spi_config.ss_pin   = SPI_SS_PIN;  		// pin 29
    spi_config.miso_pin = SPI_MISO_PIN;  //  pin 28
    spi_config.mosi_pin = SPI_MOSI_PIN;  //  pin  4
    spi_config.sck_pin  = SPI_SCK_PIN;   //  pin  3
    APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));

Please check the pins with a logic analyzer such as saleae or use a scope on those pins to double check that you actually are sending the correct data out of the chosen pins.

Best regards,
Martin L.