https://devzone.nordicsemi.com/f/nordic-q-a/27383/i2c-write-issueI am facing some issue while writing to i2c. On first i2c write , device is working but after that when i tries to write anything, code is stucking in loop. void sensor_sleep_mode(void) { ret_code_t err_code; uint8_t buff[2]={0x06, 0x01}; en-USTelligent Community 13Mon, 20 Nov 2017 15:34:14 GMThttps://devzone.nordicsemi.com/thread/108141?ContentTypeID=1Mon, 20 Nov 2017 15:34:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dc7ebac7-6deb-4979-8f4b-25b972c92703J&#248;rgen Holmefjord<p>Hi,</p> <p>The error code <code>NRF_DRV_TWI_EVT_ADDRESS_NACK</code> means that the device does not send an ACK on the address byte. Most likely the device is not ready for a new address, as you have set the <code>no_stop</code> parameter of <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v14.2.0/group__nrf__drv__twi.html#ga2c5ea8408254dfa9cbff55dbee171a95"><code>nrf_drv_twi_tx()</code></a> to true. Most devices expect a stop condition on the end of a TWI transfer, before it is ready for the next transfer. Please check the datasheet of your device.</p> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>