https://devzone.nordicsemi.com/f/nordic-q-a/76920/uart-pins-opencpu-nrf52832-socHi we are integrating a ANNA-B112 device from u-blox that use the nRF52832 core. The pin mapping for UART appears to be different for the Software (not open source) that they provide by default and the nRF5 SDK. We tried using the default pins 8(RX) anden-USTelligent Community 13Wed, 30 Jun 2021 14:22:01 GMThttps://devzone.nordicsemi.com/thread/318019?ContentTypeID=1Wed, 30 Jun 2021 14:22:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e806fd97-5130-47f0-96ad-fc54f260fdbeVidar Berg<p>Hi,</p> <p>You can assign almost any GPIO for the UART RX and TX pin (see <span><a title="GPIO usage restrictions" href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/pin.html?cp=4_2_0_3_2#concept_rfc_x1z_2q">GPIO usage restrictions</a></span> for pins you should avoid), but I guess what you are trying to find out is which of the GPIO pins are connected to the VCOM bridge on your board? I would expect that to be stated in the U-blox documentation somewhere: <a href="https://www.u-blox.com/en/product/evk-anna-b112">https://www.u-blox.com/en/product/evk-anna-b112</a></p><div style="clear:both;"></div>