https://devzone.nordicsemi.com/f/nordic-q-a/78161/question-about-using-the-twiHello, I am currently using the TWI in non-blocking mode, however I frequently run into the issue where the code gets stuck on nrf_drv_twi_tx. function at the return result statement. I can&#39;t step in or out of the code. I have also encountered this intermittentlyen-USTelligent Community 13Tue, 03 Aug 2021 13:20:45 GMThttps://devzone.nordicsemi.com/thread/323127?ContentTypeID=1Tue, 03 Aug 2021 13:20:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9a97bf0e-3503-4ad1-9c58-2a8d93e5465aJ&#248;rgen Holmefjord<p>Hi,</p> [quote user=""]I frequently run into the issue where the code gets stuck on&nbsp;nrf_drv_twi_tx. function at the return result statement.[/quote] <p>What do you mean by stuck? Do the function return a non-zero error code that puts the chip into the error handler?</p> <p>Can you post the code you used for initializing TWI and how you start and finish transfers?</p> <p>How do you ensure that the transfer is completed before starting a new transfer? In non-blocking mode, you need some synch method to make sure that no transfers are ongoing before starting a new transfer. If the application works as expected when stepping, this could indicate that the this allows enough time for the previous transfer to complete before a new transfer is stared.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>