RE: Increased current consumption moving from SDK2.3 to SDK2.6

Bard — Fri, 08 Nov 2024 09:43:15 GMT

The modem has to be turned off in SDK2.6 (but not in SDK2.3). This solves the problem.

/*
 * Copyright (c) 2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

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

/* 1000 msec = 1 sec */
#define SLEEP_TIME_MS   1000

/* The devicetree node identifier for the "led0" alias. */
#define LED0_NODE DT_ALIAS(led0)

/*
 * A build error on this line means your board is unsupported.
 * See the sample documentation for information on how to fix this.
 */
static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED0_NODE, gpios);
static const struct device *const uart =  DEVICE_DT_GET(DT_NODELABEL(uart0));

int main(void)
{
	int ret;

	if (!gpio_is_ready_dt(&led)) {
		return 0;
	}

	ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);
	if (ret < 0) {
		return 0;
	}

	pm_device_action_run(uart, PM_DEVICE_ACTION_SUSPEND);

	nrf_modem_lib_init();
	lte_lc_power_off();

	while (1) {
		ret = gpio_pin_toggle_dt(&led);
		if (ret < 0) {
			return 0;
		}
		k_msleep(SLEEP_TIME_MS);
	}
	return 0;
}

in prj.conf:

CONFIG_GPIO=y
CONFIG_PM_DEVICE=y

CONFIG_LTE_LINK_CONTROL=y
CONFIG_NRF_MODEM_LIB=y

With this code the current consumption is back at 84uA.