NCS: button press event configuration takes too much current

Question

Dear Support Team,

I realized that the callback on button press event takes about 11 µA, as reported by PPK2 & nRF52-DK with the code summarized below.

Indeed, the current absorption switches from ~8 µA to ~19 µA when the button callback is configured.

Any help ?

thank you, Paolo

main.c

#include <zephyr/kernel.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/spi.h>
#include <zephyr/pm/device.h>

#define BUTTON_NODE						DT_NODELABEL(button)
static const struct gpio_dt_spec		button_spec = GPIO_DT_SPEC_GET(BUTTON_NODE, gpios);
static struct gpio_callback			button_cb;

static void button_pressed_callback(const struct device	*gpiob,
												struct gpio_callback *cb,
												gpio_port_pins_t		pins)
{
	LOG_INF("user button pressed");
}

int main(void)
{
	while (1)
	{
		// user button
		gpio_pin_configure_dt(&button_spec, GPIO_INPUT);
		gpio_pin_interrupt_configure_dt(&button_spec, GPIO_INT_EDGE_FALLING);
		gpio_init_callback(&button_cb, button_pressed_callback, BIT(button_spec.pin));
		gpio_add_callback_dt(&button_spec, &button_cb);

		k_msleep(5000);

		gpio_remove_callback_dt(&button_spec, &button_cb);
		gpio_pin_interrupt_configure_dt(&button_spec, GPIO_INT_DISABLE);

		k_msleep(5000);
	}

	return 0;
}

board.overlay

/ {
	inputs {
		compatible = "gpio-keys";
		button: button {
			gpios = <&gpio0 11 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
		};
	};
};