P0.13 or P0.03 can't be assigned as gpio output in 5340

[zhaoyuan]

Dear,

- nRF connect SDK 1.9.1

- nRF5340 DK

Here is my code and config. I can assign some pin as gpio such as 0.04. Maybe 0.03 or 0.13 have other function mux, but I don't know how to config.

void main(void)
{
	int ret;

	const struct device *port;
	port = device_get_binding("GPIO_0");
	if(port == NULL){
		printk("LED device %s not found", "GPIO_0");
	}

	ret = gpio_pin_configure(port, 13, GPIO_OUTPUT);
	if (ret < 0) {
		return;
	}

	while (1) {
		ret = gpio_pin_toggle(port, 13);
		if (ret < 0) {
			return;
		}
		k_msleep(SLEEP_TIME_MS);
	}
}

CONFIG_GPIO=y
CONFIG_NFCT_PINS_AS_GPIOS=y

[zhaoyuan]

Hello,

Anyone can help? I have tried to disable QSPI and NFC, but it didn't work.

CONFIG_GPIO=y
CONFIG_NFCT_PINS_AS_GPIOS=y
CONFIG_NRFX_QSPI=n

[Øivind]

Hi,

P0.03 and P0.13 are hardware routed to NFC and external memory on the DK.
Changing this would require cutting and shorting the solder bridges mentioned in the NFC and external memory sections of the documentation.

https://infocenter.nordicsemi.com/topic/ug_nrf5340_dk/UG/dk/connector_if.html

I would recommend using different pins if possible.