pin 9 configuration.

[shlomots]

I have an application that tries to configure pin 9 of port 0 on the nrf52840. this pin is reserved for NFC use.
in one application it was enough to add:

&uicr {

    nfct-pins-as-gpios;

};

to the device tree.

I tried to implement the same logic on another app, a testing app, but got this error:

 

I manged to fix this by getting pin 09 out of the reserved range in the overlay file: 

&gpio0 {

    gpio-reserved-ranges = <0 2>, <6 1>, <8 1>, <17 7>;

};

but I cant understand how could it be that in one application that's needed and on the other it is not.

thanks in advance

-Shlomo

[Naeem Maroof]

Hi,

Yes, we need to add that snippet to the overlay. I am not sure what you were doing in previous application and in this application, but you can always try to debug to pin point the issue.

We have a lesson on DevAcademy about debugging and troubleshooting. You can go to exercise 2 to use the addr2line.