https://devzone.nordicsemi.com/f/nordic-q-a/22267/twi-master-blocking-mode-non-powered-peripheralHello to all nordic jedi masters! I have made an observation, on which I would like your confirmation. My combo is: nrf52832 + SDK 11 + SD132. Will my application &quot;hang&quot; if I am operating the TWI master in blocking mode, and there is no voltageen-USTelligent Community 13Wed, 24 May 2017 08:34:46 GMThttps://devzone.nordicsemi.com/thread/87533?ContentTypeID=1Wed, 24 May 2017 08:34:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0589b034-3e12-4850-b29a-3bb418ba9c68J&#248;rgen Holmefjord<p>Hi,</p> <p>As described in <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v13.0.0/hardware_driver_twi.html?cp=4_0_0_2_16_1#hardware_driver_twi_basic">the documentation</a>, when using blocking mode, the functions nrf_drv_twi_rx and nrf_drv_twi_tx return if the requested transfer is complete, or if an error was reported by the peripheral.</p> <p>If the device you are talking to is not responding or is not powered, the transfer functions will return with a NACK error:</p> <blockquote> <p><strong>NRF_ERROR_DRV_TWI_ERR_ANACK</strong> - If NACK received after sending the address in polling mode.</p> <p><strong>NRF_ERROR_DRV_TWI_ERR_DNACK</strong> - If NACK received after sending a data byte in polling mode.</p> </blockquote> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>