samples/sensor/lsm303dlhc: Add LSM303DLHC sample

Add sample application for LSM303DLHC, ST MEMS
system-in-package featuring a 3D digital linear
acceleration sensor and a 3D digital magnetic
sensor.

Enable sample to build on stm32f3_disco board
during sanitycheck.

Signed-off-by: Yannis Damigos <[email protected]>

boards/arm/stm32f3_disco/stm32f3_disco.yaml

@@ -12,3 +12,4 @@ supported:
   - rtc
   - spi
   - usb_device
+  - lsm303dlhc

samples/sensor/lsm303dlhc/CMakeLists.txt

@@ -0,0 +1,12 @@
+#
+# Copyright (c) 2018, Yannis Damigos
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+cmake_minimum_required(VERSION 3.8.2)
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(NONE)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/sensor/lsm303dlhc/README.rst

@@ -0,0 +1,51 @@
+.. _lsm303dlhc:
+
+LSM303DLHC: Magnetometer and Accelerometer data Monitor
+#######################################################
+
+Overview
+********
+This sample application periodically reads magnetometer and accelerometer data
+from the LSM303DLHC eCompass module's sensors, and displays the sensor data
+on the console.
+
+Requirements
+************
+
+This sample uses the LSM303DLHC, ST MEMS system-in-package featuring a
+3D digital linear acceleration sensor and a 3D digital magnetic sensor,
+controlled using the I2C interface.
+
+References
+**********
+
+For more information about the LSM303DLHC eCompass module, see
+http://www.st.com/en/mems-and-sensors/lsm303dlhc.html
+
+Building and Running
+********************
+
+This project outputs sensor data to the console. It requires a LSM303DLHC
+system-in-package, which is present on the stm32f3_disco board
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/sensors/lsm303dlhc
+   :board: stm32f3_disco
+   :goals: build
+   :compact:
+
+Sample Output
+=============
+
+.. code-block:: console
+
+   Magnetometer data:
+   ( x y z ) = ( 0.531818  -0.435454  -0.089090 )
+   Accelerometer data:
+   ( x y z ) = ( -0.078127  -0.347666  1.105502 )
+   Magnetometer data:
+   ( x y z ) = ( -0.003636  0.297272  -0.255454 )
+   Accelerometer data:
+   ( x y z ) = ( 0.074221  -0.304696  0.972685 )
+
+   <repeats endlessly every 2 seconds>

samples/sensor/lsm303dlhc/prj.conf

@@ -0,0 +1,5 @@
+CONFIG_STDOUT_CONSOLE=y
+CONFIG_I2C=y
+CONFIG_SENSOR=y
+CONFIG_LSM303DLHC_MAGN=y
+CONFIG_LSM303DLHC_ACCEL=y

samples/sensor/lsm303dlhc/sample.yaml

@@ -0,0 +1,7 @@
+sample:
+  name: LSM303DLHC Magnetometer and Accelerometer data Monitor
+tests:
+  test:
+    harness: sensor
+    tags: samples sensor
+    depends_on: i2c lsm303dlhc

samples/sensor/lsm303dlhc/src/main.c

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2018, Yannis Damigos
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <device.h>
+#include <sensor.h>
+#include <stdio.h>
+#include <misc/util.h>
+
+static s32_t read_sensor(struct device *sensor, enum sensor_channel channel)
+{
+	struct sensor_value val[3];
+	s32_t ret = 0;
+
+	ret = sensor_sample_fetch(sensor);
+	if (ret < 0) {
+		printf("Sensor sample update error\n");
+		goto end;
+	}
+
+	ret = sensor_channel_get(sensor, channel, val);
+	if (ret < 0) {
+		printf("Cannot read sensor channels\n");
+		goto end;
+	}
+
+	printf("( x y z ) = ( %f  %f  %f )\n", sensor_value_to_double(&val[0]),
+					       sensor_value_to_double(&val[1]),
+					       sensor_value_to_double(&val[2]));
+
+end:
+	return ret;
+}
+
+void main(void)
+{
+	struct device *accelerometer = device_get_binding(
+						CONFIG_LSM303DLHC_ACCEL_NAME);
+	struct device *magnetometer = device_get_binding(
+						CONFIG_LSM303DLHC_MAGN_NAME);
+
+	if (accelerometer == NULL) {
+		printf("Could not get %s device\n",
+				CONFIG_LSM303DLHC_ACCEL_NAME);
+		return;
+	}
+
+	if (magnetometer == NULL) {
+		printf("Could not get %s device\n",
+				CONFIG_LSM303DLHC_MAGN_NAME);
+		return;
+	}
+
+	while (1) {
+		printf("Magnetometer data:\n");
+		if (read_sensor(magnetometer, SENSOR_CHAN_MAGN_XYZ) < 0) {
+			printf("Failed to read magnetometer data\n");
+		}
+
+		printf("Accelerometer data:\n");
+		if (read_sensor(accelerometer, SENSOR_CHAN_ACCEL_XYZ) < 0) {
+			printf("Failed to read accelerometer data\n");
+		}
+
+		k_sleep(2000);
+	}
+}