cant use pin 09 of port 0. &uicr { nfct-pins-as-gpios; }; doesn't work.

RE: cant use pin 09 of port 0. &uicr { nfct-pins-as-gpios; }; doesn't work.

shlomots — Fri, 20 Dec 2024 14:57:39 GMT

Awesome, I will try that.

Thank you!

RE: cant use pin 09 of port 0. &uicr { nfct-pins-as-gpios; }; doesn't work.

Einar Thorsrud — Fri, 20 Dec 2024 14:51:00 GMT

Hi,

I see, if you are on a DK, this is expected. You need to solder or populate a 0 ohm resistor on R43, see the Configuring NFC pins as GPIOs in the DK documentation.

RE: cant use pin 09 of port 0. &uicr { nfct-pins-as-gpios; }; doesn't work.

shlomots — Fri, 20 Dec 2024 14:48:17 GMT

Actually, I see that I wasn't 100 percent clear.

The app i have written and trying to communicate with is running on a dk. I wanted first to establish communication between two dk's.

It didnt work on the dk's so i didnt try on custom board yet.

Could you expand about what the solder bridge on the dk?

RE: cant use pin 09 of port 0. &uicr { nfct-pins-as-gpios; }; doesn't work.

Einar Thorsrud — Fri, 20 Dec 2024 14:34:52 GMT

Hi,

What you have added with nfct-pins-as-gpios is all that is needed. You can double check that the pins are configured as GPIO pins by reading out the NFCPINS with a debugger. If the LSb is 0, the pin is confgiured as a GPIO an dthe issue is someting else. Could you try to configure the pin as an output and simply toggle it to see if that works?

PS: On the DK, you need to solder a solder bridge to access the GPIO on a pin header as by default the NFC pins are only routed to the NFC antenna connector, but sa you are using a custom board that is not relevant in this case.