48e235445b
Any errors are clearly indicated and program execution ended. Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>
67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
/*
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* Copyright (c) 2022 Thomas Stranger
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <zephyr/devicetree.h>
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#include <zephyr/drivers/sensor.h>
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/*
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* Get a device structure from a devicetree node with compatible
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* "maxim,ds18b20". (If there are multiple, just pick one.)
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*/
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static const struct device *get_ds18b20_device(void)
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{
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const struct device *const dev = DEVICE_DT_GET_ANY(maxim_ds18b20);
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if (dev == NULL) {
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/* No such node, or the node does not have status "okay". */
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printk("\nError: no device found.\n");
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return NULL;
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}
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if (!device_is_ready(dev)) {
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printk("\nError: Device \"%s\" is not ready; "
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"check the driver initialization logs for errors.\n",
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dev->name);
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return NULL;
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}
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printk("Found device \"%s\", getting sensor data\n", dev->name);
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return dev;
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}
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int main(void)
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{
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const struct device *dev = get_ds18b20_device();
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int res;
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if (dev == NULL) {
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return 0;
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}
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while (true) {
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struct sensor_value temp;
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res = sensor_sample_fetch(dev);
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if (res != 0) {
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printk("sample_fetch() failed: %d\n", res);
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return res;
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}
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res = sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
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if (res != 0) {
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printk("channel_get() failed: %d\n", res);
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return res;
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}
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printk("Temp: %d.%06d\n", temp.val1, temp.val2);
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k_sleep(K_MSEC(2000));
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}
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return 0;
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}
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