Spining LEDs for nRF9161

main.c

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

#include <stdio.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/gpio.h>

/* 1000 msec = 1 sec */
#define DELAY   100
#define LED_SPINS 50

/* The devicetree node identifier for the "led0" alias. */
#define LED0_NODE DT_ALIAS(led0)
#define LED1_NODE DT_ALIAS(led1)
#define LED2_NODE DT_ALIAS(led2)
#define LED3_NODE DT_ALIAS(led3)

/*
 * 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 led0_node = GPIO_DT_SPEC_GET(LED0_NODE, gpios);
static const struct gpio_dt_spec led1_node = GPIO_DT_SPEC_GET(LED1_NODE, gpios);
static const struct gpio_dt_spec led2_node = GPIO_DT_SPEC_GET(LED2_NODE, gpios);
static const struct gpio_dt_spec led3_node = GPIO_DT_SPEC_GET(LED3_NODE, gpios);

void animate_spining_leds(int run_times, bool is_clockwise) {
    int ret;
    int index = 0;
    int times = 0;
    int j_index = 0;
    unsigned long gpio_output_status;

    struct gpio_dt_spec leds[4] = { led0_node, led1_node, led3_node, led2_node };

    for (int j = 0; j < 4; j++) {
        if (!gpio_is_ready_dt(&leds[j])) {
            return;
        }
    }

    ret = gpio_pin_configure_dt(&leds[2], GPIO_OUTPUT_ACTIVE);
    if (ret < 0) {
        return;
    }

    for(;;) {
        for (int j = 0; j < 4; j++) {
            j_index = is_clockwise ? j : -j;
            gpio_output_status = ((index - j_index) % 4 == 0) ? GPIO_OUTPUT_ACTIVE : GPIO_OUTPUT_INACTIVE;
            ret = gpio_pin_configure_dt(&leds[j], gpio_output_status);
            if (ret < 0) {
                return;
            }
        }

        if (times == run_times) {
            break;
        }
        
        k_msleep(DELAY);
        
        index++;
        times++;
    }
}

void animate_back_and_forth_spining_leds() {
    bool is_clockwise;
    for(;;) {
        is_clockwise = false;
        animate_spining_leds(LED_SPINS, is_clockwise);

        is_clockwise = true;
        animate_spining_leds(LED_SPINS, is_clockwise);
    }
}

int main(void)
{
    animate_back_and_forth_spining_leds();
	return 0;
}