1 /*
2 * Copyright (c) 2017 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/drivers/sensor.h>
10 #include <stdio.h>
11 #include <zephyr/sys/util.h>
12
process_sample(const struct device * dev)13 static void process_sample(const struct device *dev)
14 {
15 static unsigned int obs;
16 struct sensor_value temp, hum;
17 if (sensor_sample_fetch(dev) < 0) {
18 printf("Sensor sample update error\n");
19 return;
20 }
21
22 if (sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp) < 0) {
23 printf("Cannot read HTS221 temperature channel\n");
24 return;
25 }
26
27 if (sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &hum) < 0) {
28 printf("Cannot read HTS221 humidity channel\n");
29 return;
30 }
31
32 ++obs;
33 printf("Observation:%u\n", obs);
34
35 /* display temperature */
36 printf("Temperature:%.1f C\n", sensor_value_to_double(&temp));
37
38 /* display humidity */
39 printf("Relative Humidity:%.1f%%\n",
40 sensor_value_to_double(&hum));
41 }
42
hts221_handler(const struct device * dev,const struct sensor_trigger * trig)43 static void hts221_handler(const struct device *dev,
44 const struct sensor_trigger *trig)
45 {
46 process_sample(dev);
47 }
48
main(void)49 int main(void)
50 {
51 const struct device *const dev = DEVICE_DT_GET_ONE(st_hts221);
52
53 if (!device_is_ready(dev)) {
54 printk("sensor: device not ready.\n");
55 return 0;
56 }
57
58 if (IS_ENABLED(CONFIG_HTS221_TRIGGER)) {
59 struct sensor_trigger trig = {
60 .type = SENSOR_TRIG_DATA_READY,
61 .chan = SENSOR_CHAN_ALL,
62 };
63 if (sensor_trigger_set(dev, &trig, hts221_handler) < 0) {
64 printf("Cannot configure trigger\n");
65 return 0;
66 }
67 }
68
69 while (!IS_ENABLED(CONFIG_HTS221_TRIGGER)) {
70 process_sample(dev);
71 k_sleep(K_MSEC(2000));
72 }
73 k_sleep(K_FOREVER);
74 return 0;
75 }
76
