https://devzone.nordicsemi.com/f/nordic-q-a/38485/why-i-i-got-nrf_drv_twi_evt_data_nack-when-try-to-call-nrf_drv_twi_tx-in-another-functionIn the main function, this works. Works .. Not works , I got NRF_DRV_TWI_EVT_DATA_NACK error.. and I cannot call &quot;nrf_drv_twi_tx&quot; in the timer event handler function? When I try to call &quot; nrf_drv_twi_tx&quot; in the timer event handler (foren-USTelligent Community 13Wed, 19 Sep 2018 09:53:52 GMThttps://devzone.nordicsemi.com/thread/149383?ContentTypeID=1Wed, 19 Sep 2018 09:53:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:06c27f34-4ca6-48d4-875f-1ec6d1eed4a3MartinBL<p>Can you upload the rest of your code?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/148893?ContentTypeID=1Mon, 17 Sep 2018 02:47:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:307bc992-640c-4352-b986-6d0bad5ca218sosse<p>yes, the sht_measurement() is defined in the same file.&nbsp;&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/148562?ContentTypeID=1Thu, 13 Sep 2018 09:07:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c05b66af-6cd4-4742-9146-a246c43456e2MartinBL<p>That is strange.</p> <p>Is&nbsp;sht_measurement() defined in the same file? I assume&nbsp;SHT_ADDRESS and the reg buffer is containing the exact same address and buffer?</p><div style="clear:both;"></div>