(nRF52 DK) Why do GPIO 8 and 20 read ~1.5V and ~2.6V with no firmware flashed, just nRF52 DK powered on?

RE: (nRF52 DK) Why do GPIO 8 and 20 read ~1.5V and ~2.6V with no firmware flashed, just nRF52 DK powered on?

Noah — Wed, 05 Jun 2019 13:49:48 GMT

Awesome! Did just this yesterday (read the back of the DK) and it works as expected. Thanks

awneil — Wed, 05 Jun 2019 08:34:28 GMT

I meant, have you looked at the DK schematics to see if anything is physically wired to those pins.

See Simonr's reply!

Simonr — Wed, 05 Jun 2019 08:28:37 GMT

Hi Noah

P0.08 is physically connected to the debugger. If you'd like for the pin to only be connected to nRF52832 you have to cut the solder bridge SB25.

P0.20 is used to control LED 4. If you need it elsewhere you can disconnect the LED by cutting solder bridge SB8.

Please refer to the DK user guide to see where they are located etc.

Best regards,

Simon

Noah — Tue, 04 Jun 2019 17:40:15 GMT

Yes, I've found that NFC and UART pins can occupy pin 20 but I'm fairly sure I've disabled these.

awneil — Tue, 04 Jun 2019 17:39:12 GMT

Have you looked at the DK schematics and/or User Manual for clues ... ?