https://devzone.nordicsemi.com/f/nordic-q-a/86522/about-twi_init-functionI have to initialize a i2c multiplexer, for that I am sending the device address and register address to be written using the function: nrf_drv_twi_tx(&amp;m_twi, (0x70), tx_buf, sizeof(tx_buf), false); Whenever I call this function, the flow is stucken-USTelligent Community 13Fri, 01 Apr 2022 13:22:52 GMThttps://devzone.nordicsemi.com/thread/361251?ContentTypeID=1Fri, 01 Apr 2022 13:22:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41eee62d-1a81-47e7-a131-5e2e899fc908Edvin<p>Hello,</p> <p>Your snipped doesn&#39;t seem to include <span>nrf_drv_twi_tx</span>(); From where do you call it? Is it from your main() function, or from an interrupt? And where do you set m_xfer_done = true?</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>