1 /*
2 * Copyright (c) 2021 Linaro Limited
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/kernel.h>
8 #include <zephyr/device.h>
9 #include <zephyr/devicetree.h>
10 #include <zephyr/drivers/gpio.h>
11 #include <zephyr/sys/printk.h>
12
13 /* define SLEEP_TIME_MS higher than <st,counter-value> in ms */
14 #if DT_PROP(DT_NODELABEL(stm32_lp_tick_source), st_counter_value)
15 #define SLEEP_TIME_MS (DT_PROP(DT_NODELABEL(stm32_lp_tick_source), st_counter_value) * 1400)
16 #else
17 #define SLEEP_TIME_MS 2000
18 #endif
19
20 static const struct gpio_dt_spec led =
21 GPIO_DT_SPEC_GET(DT_ALIAS(led0), gpios);
22
main(void)23 int main(void)
24 {
25 bool led_is_on = true;
26
27 __ASSERT_NO_MSG(gpio_is_ready_dt(&led));
28
29 printk("Device ready\n");
30
31 while (true) {
32 gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);
33 gpio_pin_set(led.port, led.pin, (int)led_is_on);
34 if (led_is_on == false) {
35 /* Release resource to release device clock */
36 gpio_pin_configure(led.port, led.pin, GPIO_DISCONNECTED);
37 }
38 k_msleep(SLEEP_TIME_MS);
39 if (led_is_on == true) {
40 /* Release resource to release device clock */
41 gpio_pin_configure(led.port, led.pin, GPIO_DISCONNECTED);
42 }
43 led_is_on = !led_is_on;
44 }
45 return 0;
46 }
47
