RE: How to configure the P0.00 and P0.01 pins as GPIO?

Håkon Alseth — Tue, 16 May 2023 12:49:17 GMT

Hi,

If your board has a low frequency 32k crystal connected to the P0.00/P0.01 pins, this must be physically removed in order for you to use those pins as normal GPIOs.

To change the LFCLK source, you can set this kconfig entry:

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

[quote user=""]And most important, is the 32.768KHz crystal necessary for the BLE or the Zephyr's kernel?[/quote]

Yes, there's a hard requirement to use a LFCLK.

Please note that you can use the internal 32k RC oscillator for this, which does not have a GPIO dependency.

Kind regards,

Håkon