From f0090825beb6da2b0fb11670327d98f1c337baac Mon Sep 17 00:00:00 2001
From: Alexander Wachter <alexander.wachter@student.tugraz.at>
Date: Mon, 8 Oct 2018 16:27:33 +0200
Subject: [PATCH] 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 | 11 +++++++++
 samples/sensor/ens210/README.rst     | 34 +++++++++++++++++++++++++++
 samples/sensor/ens210/ens210.overlay | 15 ++++++++++++
 samples/sensor/ens210/prj.conf       |  3 +++
 samples/sensor/ens210/sample.yaml    |  8 +++++++
 samples/sensor/ens210/src/main.c     | 35 ++++++++++++++++++++++++++++
 6 files changed, 106 insertions(+)
 create mode 100644 samples/sensor/ens210/CMakeLists.txt
 create mode 100644 samples/sensor/ens210/README.rst
 create mode 100644 samples/sensor/ens210/ens210.overlay
 create mode 100644 samples/sensor/ens210/prj.conf
 create mode 100644 samples/sensor/ens210/sample.yaml
 create mode 100644 samples/sensor/ens210/src/main.c

diff --git a/samples/sensor/ens210/CMakeLists.txt b/samples/sensor/ens210/CMakeLists.txt
new file mode 100644
index 00000000000..4d9acb8693e
--- /dev/null
+++ b/samples/sensor/ens210/CMakeLists.txt
@@ -0,0 +1,11 @@
+# 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})
diff --git a/samples/sensor/ens210/README.rst b/samples/sensor/ens210/README.rst
new file mode 100644
index 00000000000..206f06a62f9
--- /dev/null
+++ b/samples/sensor/ens210/README.rst
@@ -0,0 +1,34 @@
+.. _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%
diff --git a/samples/sensor/ens210/ens210.overlay b/samples/sensor/ens210/ens210.overlay
new file mode 100644
index 00000000000..7bfce6b16a7
--- /dev/null
+++ b/samples/sensor/ens210/ens210.overlay
@@ -0,0 +1,15 @@
+/*
+ * 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";
+	};
+};
diff --git a/samples/sensor/ens210/prj.conf b/samples/sensor/ens210/prj.conf
new file mode 100644
index 00000000000..6842996e3de
--- /dev/null
+++ b/samples/sensor/ens210/prj.conf
@@ -0,0 +1,3 @@
+CONFIG_I2C=y
+CONFIG_SENSOR=y
+CONFIG_ENS210=y
diff --git a/samples/sensor/ens210/sample.yaml b/samples/sensor/ens210/sample.yaml
new file mode 100644
index 00000000000..a027787843a
--- /dev/null
+++ b/samples/sensor/ens210/sample.yaml
@@ -0,0 +1,8 @@
+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
diff --git a/samples/sensor/ens210/src/main.c b/samples/sensor/ens210/src/main.c
new file mode 100644
index 00000000000..77e071eec80
--- /dev/null
+++ b/samples/sensor/ens210/src/main.c
@@ -0,0 +1,35 @@
+/*
+ * 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);
+	}
+}