Receiving 1024 byte of data continuously over TWIS i2c slave

[pradeep8892]

Hi All,

I have a device configured as i2c master, The device is sending 1024 byte of data to NRF52832 DK continuously in form of 255-bytes packet. But I observed that I am able to receive only 1 packet of 255 bytes all other packets get missed and the event does not trigger for the rest of the packet. I2c master device is sending 1024 byte of data continuously with an interval of 20 secs. So each time I only receive 1st packet all other packets get missed. following is the event handler

 static void twis_event_handler(nrf_drv_twis_evt_t const * const p_event)
  {
     
      switch (p_event->type)
      {
      case TWIS_EVT_READ_REQ:
        if (p_event->data.buf_req)
        {
           nrf_drv_twis_tx_prepare(&m_twis, tx_buffer, TWIS_MAX_LENGHT);
        }
        break;
      case TWIS_EVT_READ_DONE:
          memset(tx_buffer, 0x00, sizeof(tx_buffer));
      case TWIS_EVT_WRITE_REQ:
          nrf_drv_twis_rx_prepare(&m_twis, rx_buffer, sizeof(rx_buffer));
          break;
      case TWIS_EVT_WRITE_DONE:
            handleCommand(rx_buffer[0]);
            memset(rx_buffer, 0x00, TWIS_MAX_LENGHT);
            break;
                          

      case TWIS_EVT_READ_ERROR:
      case TWIS_EVT_WRITE_ERROR:
      case TWIS_EVT_GENERAL_ERROR:
          m_error_flag = true;
          break;
      default:
          break;
      }
  }

Can any help me to solve this issue, Why data get missed and how can i receive the data successfully.

Thanks and Regards,

Pradeep

[Turbo J]

Too much data.

NRF52832 only supports up to 255 byte in a single TWIS transaction, as this is the maximum possible value in the TXD/RXD AMOUNT and MAXCNT registers.

Upgrading to NRF52840 could work, as this chip has more "bits" in these registers.

[pradeep8892]

I understand, NRF52832 only supports up to 255 bytes in a single TWIS transaction, But i2c master is sending 4 packets of 255 bytes separately not in a single transaction.

[Kenneth]

Does each TWI transfer consist of a start and stop condition? What delay is there between each transmission?

Kenneth

[pradeep8892]

Hi Kenneth,

So, it was happening because of a peripheral now we have identified and solved the issue.