dfc747d53a
This simple application periodically prints the temperature and humidity measured by one or more digital humidity/temperature sensors. Signed-off-by: Ian Morris <ian.d.morris@outlook.com>
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
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* Copyright (c) 2023 Ian Morris
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/sensor.h>
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#include <zephyr/sys/util_macro.h>
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#include <zephyr/kernel.h>
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#define DHT_ALIAS(i) DT_ALIAS(_CONCAT(dht, i))
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#define DHT_DEVICE(i, _) \
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IF_ENABLED(DT_NODE_EXISTS(DHT_ALIAS(i)), (DEVICE_DT_GET(DHT_ALIAS(i)),))
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/* Support up to 10 temperature/humidity sensors */
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static const struct device *const sensors[] = {LISTIFY(10, DHT_DEVICE, ())};
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int main(void)
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{
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int rc;
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for (size_t i = 0; i < ARRAY_SIZE(sensors); i++) {
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if (!device_is_ready(sensors[i])) {
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printk("sensor: device %s not ready.\n", sensors[i]->name);
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return 0;
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}
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}
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while (1) {
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for (size_t i = 0; i < ARRAY_SIZE(sensors); i++) {
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struct device *dev = (struct device *)sensors[i];
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rc = sensor_sample_fetch(dev);
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if (rc < 0) {
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printk("%s: sensor_sample_fetch() failed: %d\n", dev->name, rc);
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return rc;
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}
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struct sensor_value temp;
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struct sensor_value hum;
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rc = sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
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if (rc == 0) {
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rc = sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &hum);
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}
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if (rc != 0) {
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printf("get failed: %d\n", rc);
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break;
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}
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printk("%16s: temp is %d.%02d °C humidity is %d.%02d %%RH\n",
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dev->name, temp.val1, temp.val2 / 10000,
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hum.val1, hum.val2 / 10000);
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}
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k_msleep(1000);
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}
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return 0;
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}
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