Unable to toggle P0.00 pin with internal RC oscillator selected

[Vivien_]

Hello, 

I'm using an NRF5340 with SDK V1.9.1.

I have a code that toggle one gpio pin on a custom board. It is working well when I use P0.22. However, when I change to P0.00 the output remains to 0.

I know that P0.00 is used for cristal oscillator but I have none on my custom board so in the config of the board i'm using the internal RC oscillator for CPU NET and CPU APP:

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n

I have done the same test on the NRF5340DK following these instructions to disconnect the crystal oscillator: Nordic Semiconductor Infocenter. In the dev kit I still have the problem, no signal on P0.00. 

Here the code for the pin on the device tree:

	gpio_keys {
		compatible = "gpio-keys";

		ledr: led_r{
			gpios = <&gpio0 00 GPIO_ACTIVE_HIGH>;
			label = "LED R";
		};
	};
	aliases {
		ctrl-led-r = &ledr;
	};

I don't know what I'm missing if someone have an idea. 

Thank you,

[Priyanka]

Hi Vivien,

Did you cut the solder bridge SB1 and short the SB3 on the nRF5340DK?

Best Regards,

Priyanka

[Vivien_]

Hello, 

Thank you for your answer. I have just solved my issue by adding to the prj.conf the following config:

CONFIG_SOC_ENABLE_LFXO=n

Everything works fine now !

Best Regards,

Vivien