samples: sensor: tmp116: Add sample for TMP116

Added sample demonstrating the TMP116 temperature sensor.

Signed-off-by: Ioannis Konstantelias <ikonstadel@gmail.com>

samples/sensor/tmp116/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(tmp116)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/sensor/tmp116/README.rst

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+.. _ti_tmp116_sample:
+
+TI_TMP116 Sample
+################
+
+Description
+***********
+
+This sample application periodically takes temperature readings using the ti_tmp116
+sensor driver. The result is written to the console.
+
+Requirements
+************
+
+This sample needs a TI TMP116 sensor connected to the target board's I2C
+connector.
+
+
+Wiring
+******
+
+This sample is tested with Nucleo STM32F401RE board.
+
+The sensor operates at 3.3V and uses I2C to communicate with the board.
+
+External Wires:
+
+* Breakout **GND** pin <--> Nucleo **GND** pin
+* Breakout **VCC** pin <--> Nucleo **3V3** pin
+* Breakout **SDA** pin <--> Nucleo **CN5-D14** pin
+* Breakout **SCL** pin <--> Nucleo **CN5-D15** pin
+
+Building and Running
+********************
+
+In order to build the sample, connect the board to the computer with a USB cable and enter the
+following commands:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/sensor/tmp116
+   :board: nucleo_f401re
+   :goals: build flash
+   :compact:
+
+Sample Output
+*************
+The output can be seen via a terminal emultator (e.g. minicom). Connect the board with a USB cable
+to the computer and open /dev/ttyACM0 with the below serial settings:
+
+* Baudrate: 115200
+* Parity: None
+* Data: 8
+* Stop bits: 1
+
+The output should look like this:
+
+.. code-block:: console
+
+    Device TMP116 - 0x200010a8 is ready
+    temp is 26.7031250 oC
+    temp is 26.7109375 oC
+    ...

samples/sensor/tmp116/nucleo_f401re.overlay

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+/*
+ * Copyright (c) 2019 Centaur Analytics, Inc
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&i2c1 {
+
+	ti_tmp116: ti_tmp116@4b {
+		compatible = "ti,tmp116";
+		reg = <0x4B>;
+		label = "TMP116";
+	};
+
+};

samples/sensor/tmp116/prj.conf

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+CONFIG_STDOUT_CONSOLE=y
+CONFIG_I2C=y
+CONFIG_SENSOR=y
+CONFIG_TMP116=y

samples/sensor/tmp116/sample.yaml

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+sample:
+  name: TI TMP116 Sensor Sample
+tests:
+  test_build:
+    harness: sensor
+    platform_whitelist: nucleo_f401re
+    tags: sensors
+    depends_on: i2c
+  sample.sensor.tmp116:
+    harness: console
+    platform_whitelist: nucleo_f401re
+    tags: sensors
+    depends_on: i2c
+    harness_config:
+        type: one_line
+        regex:
+            - "temp is (.*) oC"
+        fixture: fixture_i2c_tmp116

samples/sensor/tmp116/src/main.c

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+/*
+ * Copyright (c) 2019 Centaur Analytics, Inc
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <device.h>
+#include <drivers/sensor.h>
+#include <sys/printk.h>
+#include <sys/__assert.h>
+
+void main(void)
+{
+	struct device *dev;
+	struct sensor_value temp_value;
+	int ret;
+
+	dev = device_get_binding(DT_INST_0_TI_TMP116_LABEL);
+	__ASSERT(dev != NULL, "Failed to get TMP116 device binding");
+
+	printk("Device %s - %p is ready\n", dev->config->name, dev);
+
+	while (1) {
+		ret = sensor_sample_fetch(dev);
+		if (ret) {
+			printk("Failed to fetch measurements (%d)\n", ret);
+			return;
+		}
+
+		ret = sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP,
+					 &temp_value);
+		if (ret) {
+			printk("Failed to get measurements (%d)\n", ret);
+			return;
+		}
+
+		printk("temp is %d.%d oC\n", temp_value.val1, temp_value.val2);
+
+		k_sleep(1000);
+	}
+}