samples: sensor: ens210: Implement sample for ens210

Sample code for AMS (Austria Micro Systems) ENS210 temperature and
relative humidity sensor.

Signed-off-by: Alexander Wachter <alexander.wachter@student.tugraz.at>

samples/sensor/ens210/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+set(DTC_OVERLAY_FILE "${CMAKE_CURRENT_SOURCE_DIR}/ens210.overlay")
+
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(ens210)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/sensor/ens210/README.rst

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+.. _ens210:
+
+ams ens210 Relative Humidity and Temperature Sensor
+###################################################
+
+Overview
+********
+
+This sample application demonstrates how to use the ams ens210 sensor to
+measure the ambient temperature and relative humidity.
+
+Building and Running
+********************
+
+This sample application uses the sensor connected to the i2c stated in the
+ens210.overlay file.
+Flash the binary to a board of choice with a sensor connected.
+For example build for a nucleo_f446re board:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/sensors/ens210
+   :board: nucleo_f446re
+   :goals: build flash
+   :compact:
+
+Sample Output
+=============
+
+.. code-block:: console
+
+    device is 0x20001174, name is ENS210
+    Temperature: 28.28881222 C; Humidity: 25.25689737%
+    Temperature: 28.28912472 C; Humidity: 25.25799105%
+    Temperature: 28.28959347 C; Humidity: 25.25760045%

samples/sensor/ens210/ens210.overlay

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+/*
+ * Copyright (c) 2018 Alexander Wachter
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&arduino_i2c {
+	status = "ok";
+	clock-frequency = <I2C_BITRATE_FAST>;
+
+	ens210: ens210@43 {
+		compatible = "ams,ens210";
+		reg = <0x43>;
+		label = "ENS210";
+	};
+};

samples/sensor/ens210/prj.conf

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+CONFIG_I2C=y
+CONFIG_SENSOR=y
+CONFIG_ENS210=y

samples/sensor/ens210/sample.yaml

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+sample:
+  description: Demonstration of the AMS Temperature and Humidity Sensor driver
+  name: ENS210 sample
+tests:
+  test:
+    harness: sensor
+    tags: samples
+    depends_on: i2c arduino_i2c

samples/sensor/ens210/src/main.c

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+/*
+ * Copyright (c) 2018 Alexander Wachter
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <device.h>
+#include <sensor.h>
+#include <misc/printk.h>
+
+void main(void)
+{
+	struct device *dev;
+	struct sensor_value temperature, humidity;
+
+	dev = device_get_binding(DT_AMS_ENS210_0_LABEL);
+	if (!dev) {
+		printk("Failed to get device binding");
+		return;
+	}
+
+	printk("device is %p, name is %s\n", dev, dev->config->name);
+
+	while (1) {
+		sensor_sample_fetch(dev);
+		sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &humidity);
+		sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temperature);
+		printk("Temperature: %d.%06d C; Humidity: %d.%06d%%\n",
+			temperature.val1, temperature.val2,
+			humidity.val1, humidity.val2);
+
+		k_sleep(1000);
+	}
+}