NFC Pins drive strength and configuration

RE: NFC Pins drive strength and configuration

Jared — Mon, 19 Feb 2024 09:06:34 GMT

Hi Alberto,

I wrongfully assumed that you had already this defined in your project config. But yes, by default the GPIO P0.09 and P0.10 are assigned to the NFC peripheral instead of the GPIO peripheral.

I'm happy that you found the solution,

regards

Jared

RE: NFC Pins drive strength and configuration

Albert_0 — Mon, 19 Feb 2024 06:57:05 GMT

Problem solved.

I need to set:

CONFIG_NFCT_PINS_AS_GPIOS=y

Now the pins work as expected.

Cheers,

Alberto

RE: NFC Pins drive strength and configuration

Albert_0 — Mon, 19 Feb 2024 04:51:33 GMT

Hi Jared,

this is the printout when I look at all P0 registers, with GPIO09 and GPIO10:

[00:00:00.000,366] <inf> leds: Initialising LEDs
[00:00:00.000,396] <inf> leds: GPIO0.OUT: 0x00000210
[00:00:00.000,427] <inf> leds: GPIO0.OUTSET: 0x00000210
[00:00:00.000,427] <inf> leds: GPIO0.OUTCLR: 0x00000210
[00:00:00.000,427] <inf> leds: GPIO0.IN: 0x08040000
[00:00:00.000,457] <inf> leds: GPIO0.DIR: 0x04000650
[00:00:00.000,457] <inf> leds: GPIO0.DIRSET: 0x04000650
[00:00:00.000,488] <inf> leds: GPIO0.DIRCLR: 0x04000650
[00:00:00.000,488] <inf> leds: GPIO0.LATCH: 0x00000000
[00:00:00.000,518] <inf> leds: GPIO0.DETECTMODE: 0x00000000
[00:00:00.000,518] <inf> leds: GPIO0.PIN_CNF[9]: 0x00000003
[00:00:00.000,518] <inf> leds: GPIO0.PIN_CNF[10]: 0x00000003

I can confirm that the resistance (pull up and down) when the board is off is 10K, but I have not measured it with the board powered. I'll investigate a bit further.

Cheers,

Alberto

RE: NFC Pins drive strength and configuration

Jared — Thu, 15 Feb 2024 08:47:33 GMT

Alright,

Looking forward to your update!

regards

Jared

RE: NFC Pins drive strength and configuration

Albert_0 — Thu, 15 Feb 2024 02:10:40 GMT

Thank you Jared. I will be back in the office to test on Monday and will get back to you then.

Cheers,

Alberto

RE: NFC Pins drive strength and configuration

Jared — Wed, 14 Feb 2024 12:14:45 GMT

Hi,

Is the internal pull on the pins configured as well?

Can you set a breakpoint in the program after the pin has been configured and read out PIN_CNF[n] register for NFC1 and NFC2?

regards
Jared