SPI cannot receive Data

[konsang]

Hi,

I fail receive data from SPI.

I have check the signal from oscilloscope, there slave does reply SPI data to master. So, It is definitely is code problem.

Below is my code;

#define AS3933_SPI_INSTANCE   0
static const nrf_drv_spi_t AS3933_SPI = NRF_DRV_SPI_INSTANCE(AS3933_SPI_INSTANCE);
volatile bool AS3933_SPI_XFER_Done;
void AS3933_SPI_Event_Handler(nrf_drv_spi_evt_t const * p_event, void *p_context) 
{
    AS3933_SPI_XFER_Done = true;
}

void as_SPI_TX_Byte(uint8_t v){
uint8_t SPI_RX;

    AS3933_SPI_XFER_Done = false;
    APP_ERROR_CHECK(nrf_drv_spi_transfer(&AS3933_SPI, &v, 1, &SPI_RX, 1));
    while(!AS3933_SPI_XFER_Done);
}

uint8_t as_SPI_Rx_Byte(uint8_t v){
uint8_t SPI_RX;
uint8_t SPI_TX = v;

    AS3933_SPI_XFER_Done = false;
    APP_ERROR_CHECK(nrf_drv_spi_transfer(&AS3933_SPI, &SPI_TX, 1, &SPI_RX, 1));
    while(!AS3933_SPI_XFER_Done);
    
    return SPI_RX;
}

void as_write_reg(uint8_t no, uint8_t data){

      if(no>=0 && no<=19){
          nrf_gpio_pin_set(AS3933_SPI_SS_PIN); 
          as_SPI_TX_Byte(no); 
          as_SPI_TX_Byte(data);
          nrf_gpio_pin_clear(AS3933_SPI_SS_PIN);
      }
}

uint8_t as_read_reg(uint8_t no){
uint8_t data;
    if(no>=0 && no<=19){
        nrf_gpio_pin_set(AS3933_SPI_SS_PIN);
        as_SPI_TX_Byte(0x40|no);
        data = as_SPI_Rx_Byte(0);
        nrf_gpio_pin_clear(AS3933_SPI_SS_PIN);
    }
    return data;
}

void Init_AS3933(void)
{

    nrf_gpio_cfg_output(AS3933_SPI_SS_PIN);
    nrf_gpio_cfg_input(AS3932_WAKE_PIN, NRF_GPIO_PIN_NOPULL);


    nrf_drv_spi_config_t AS3933_SPI_Config = NRF_DRV_SPI_DEFAULT_CONFIG;
    AS3933_SPI_Config.ss_pin   = NRF_DRV_SPI_PIN_NOT_USED;
    AS3933_SPI_Config.mode     = NRF_DRV_SPI_MODE_1,  
    AS3933_SPI_Config.miso_pin = AS3933_SPI_MOSI_PIN;
    AS3933_SPI_Config.mosi_pin = AS3933_SPI_MISO_PIN;
    AS3933_SPI_Config.sck_pin  = AS3933_SPI_SCK_PIN;

    APP_ERROR_CHECK(nrf_drv_spi_init(&AS3933_SPI , &AS3933_SPI_Config, AS3933_SPI_Event_Handler, NULL));

    nrf_gpio_pin_set(AS3933_SPI_SS_PIN);
    as_SPI_TX_Byte(0);
    as_SPI_TX_Byte(R0);
    as_SPI_TX_Byte(R1);
    as_SPI_TX_Byte(R2);
    as_SPI_TX_Byte(R3);
    as_SPI_TX_Byte(R4);
    as_SPI_TX_Byte(R5);
    as_SPI_TX_Byte(R6);
    as_SPI_TX_Byte(R7);
    as_SPI_TX_Byte(R8);
    as_SPI_TX_Byte(R9);
    
    
    nrf_gpio_pin_clear(AS3933_SPI_SS_PIN);
}


void Main(void){
uint8_t v;
    Init_AS3933();
    while(1){
      v = as_read_reg(0);
      nrf_delay_ms(10);
      printf("%X ",v);
    }
}

Printf print out value '0' which is wrong.

By right way, the printf should print out value '3'. 

Please advise.

Thanks

[konsang]

Hi,

Problem solved. It is due to AS3933_SPI_Config.mode     = NRF_DRV_SPI_MODE_1.

Thanks