How can we Differentiate between Dout/RDY pin. ? (Part number : ad7124-4) How can we handle interrupt. on Dout/RDY pin?

Hi GeorgeADI ,

Haven't used Nucleo boards, but would assume that you could monitor the MISO signal with a generic GPIO connected parallel to the MISO, that is capable to generate edge triggered interrupts

Cheers, heke

Here is the code I use on nucleo-G474re to read AD7124-4 (arduino IDE):

uint32_t get_data(void)
{
  static  uint8_t   rx[8]   = { 0};
  static  uint8_t   tx[8]   = { 0};
          uint32_t  resultat  =  0;

          uint8_t   head = 0;
          uint8_t   size_reg;
      
    // head |= address_spi;    
    head |= 0x02;   // data reg. = 2
    head |= 0x40;   // read

    if(debug_osm == 2) {
      Serial.print(F("\n\thead: "));
      Serial.print(head, BIN);
      }

    tx[0] = head;

    detachInterrupt( 29);
    
      SPI.transfer(CS_PIN1, tx, rx, 5, SPI_LAST); 
 
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_RESET);
    delayMicroseconds(10);
    attachInterrupt( 29, data_contread, FALLING); // PD2

      resultat  |= rx[4];
      resultat  <<= 8;
      resultat  |= rx[1];
      resultat  <<= 8;
      resultat  |= rx[2];
      resultat  <<= 8;
      resultat  |= rx[3];
    
  return resultat;
}

There is no issue to switch interrupt of before SPI transaction takes place, you can use HAL driver for this.

Hi GeorgeADI ,

Apologies for missing the thread. In a case where the DOUT/RDY is shared with the MISO pin, you may connect the MISO pin to an Arduino pin via a jumper (say D8 for example) and make D8 as the source of interrupt. This was done with AD717x example code; it uses a different ADC but it can be used as a reference along with AD7124 example codes to generate their code specific for AD7124.

You may refer to this link AD717x IIO Application [Analog Devices Wiki] or visit the AD7175-8 and AD7124-4 product page for your reference. 

Thanks and regards,

Rod