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