https://devzone.nordicsemi.com/f/nordic-q-a/20372/nrf52-i2c-initializationhello, According to the &quot;twi_scanner&quot; example from the SDK12.2 I don&#39;t understand how the respective I2C pins/GPIOs are set up. There is this function that I found &quot;nrf_gpio_cfg()&quot; in the &quot;nrf_gpio.h&quot; but in the example this function is not calleden-USTelligent Community 13Mon, 13 Mar 2017 10:15:15 GMThttps://devzone.nordicsemi.com/thread/79415?ContentTypeID=1Mon, 13 Mar 2017 10:15:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c67bd521-1a85-4310-96b2-3b7ebdf7648dbjorn-spockeli<p>Yes, the TWI driver enables the pullups by default, see <a href="https://devzone.nordicsemi.com/question/119869/use-internal-nrf52-pull-up-w-twim/?answer=120020#post-id-120020">this</a> answer for more details.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/79414?ContentTypeID=1Mon, 13 Mar 2017 09:19:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dccd1ae2-44cc-47ca-98b8-866eb90333e8Jakub Rzeszutko<p>Hi,</p> <p>In main.c for &quot;twi_scanner&quot; you have function: twi_init(). It calls: nrf_drv_twi_init which initializes TWI PINs using &quot;nrf_twi_pins_set&quot;.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/79413?ContentTypeID=1Mon, 13 Mar 2017 08:12:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9c0f8735-76b7-4ab3-9e11-c6ee4df3c818H4NNE5<p>Pushing up :)</p><div style="clear:both;"></div>