samples: sensor: Added sample for MS5837 sensor

Added sample code for MS5837 pressure sensor

Signed-off-by: Jan Van Winkel <jan.van_winkel@dxplore.eu>

samples/sensor/ms5837/CMakeLists.txt

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+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/ms5837/README.rst

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+.. _ms5837-sample:
+
+MS5837 Sensor Sample
+####################
+
+Overview
+********
+
+This sample application retrieves the pressure and temperature from a MS5837
+sensor every 10 seconds, and prints this information to the UART console.
+
+Requirements
+************
+
+- `nRF52840 Preview development kit`_
+- MS5837 sensor
+
+Wiring
+******
+
+The nrf52840 Preview development kit should be connected as follows to the
+MS5837 sensor.
+
++-------------+----------+
+| | nrf52840  | | MS5837 |
+| | Pin       | | Pin    |
++=============+==========+
+| P0.3        | SCL      |
++-------------+----------+
+| P0.31       | SDA      |
++-------------+----------+
+
+Building and Running
+********************
+
+Build this sample using the following commands:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/sensor/ms5837
+   :board: nrf52840_pca10056
+   :goals: build
+   :compact:
+
+See :ref:`nrf52840_pca10056` on how to flash the build.
+
+References
+**********
+
+.. target-notes::
+
+.. _MS5837 Sensor: http://www.te.com/usa-en/product-CAT-BLPS0017.html?q=&type=products&samples=N&q2=ms5837
+.. _nRF52840 Preview development kit: http://www.nordicsemi.com/eng/Products/nRF52840-Preview-DK

samples/sensor/ms5837/dts_fixup.h

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+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#if defined(CONFIG_HAS_DTS_I2C)
+
+#ifdef CONFIG_I2C_NRFX
+
+#ifndef CONFIG_MS5837_DEV_NAME
+
+#define CONFIG_MS5837_DEV_NAME \
+	NORDIC_NRF_I2C_40004000_MEAS_MS5837_76_LABEL
+#define CONFIG_MS5837_I2C_MASTER_DEV_NAME \
+	NORDIC_NRF_I2C_40004000_MEAS_MS5837_76_BUS_NAME
+#endif
+
+#else
+
+#ifndef CONFIG_MS5837_DEV_NAME
+#define CONFIG_MS5837_DEV_NAME            ""
+#define CONFIG_MS5837_I2C_MASTER_DEV_NAME ""
+#endif
+
+#endif
+
+#endif
+

samples/sensor/ms5837/nrf52840_pca10056.overlay

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+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&i2c1 {
+    status = "ok";
+    clock-frequency = <I2C_BITRATE_STANDARD>;
+    ms5837@76 {
+        compatible = "meas,ms5837";
+        reg = <0x76>;
+        label = "MS5837";
+    };
+};

samples/sensor/ms5837/prj.conf

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+CONFIG_STDOUT_CONSOLE=y
+
+CONFIG_SYS_LOG=y
+CONFIG_SYS_LOG_SHOW_TAGS=y
+CONFIG_SYS_LOG_SHOW_COLOR=y
+CONFIG_SYS_LOG_DEFAULT_LEVEL=1
+CONFIG_SYS_LOG_OVERRIDE_LEVEL=1
+
+CONFIG_I2C=y
+CONFIG_I2C_1=y
+CONFIG_I2C_NRFX=y
+
+CONFIG_SENSOR=y
+CONFIG_MS5837=y
+

samples/sensor/ms5837/sample.yaml

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+sample:
+  description: TBD
+  name: TBD
+tests:
+  test:
+    build_only: true
+    platform_whitelist: nrf52840_pca10056
+    tags: samples sensor

samples/sensor/ms5837/src/main.c

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+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <device.h>
+#include <sensor.h>
+#include <stdio.h>
+#include <zephyr.h>
+
+#define SYS_LOG_DOMAIN "main"
+#define SYS_LOG_LEVEL SYS_LOG_LEVEL_DEBUG
+#include <logging/sys_log.h>
+
+void main(void)
+{
+	struct sensor_value oversampling_rate = { 8192, 0 };
+	struct device *dev = device_get_binding(CONFIG_MS5837_DEV_NAME);
+
+	if (dev == NULL) {
+		SYS_LOG_ERR("Could not find MS5837 device, aborting test.");
+		return;
+	}
+
+	if (sensor_attr_set(dev, SENSOR_CHAN_ALL, SENSOR_ATTR_OVERSAMPLING,
+				&oversampling_rate) != 0) {
+		SYS_LOG_ERR("Could not set oversampling rate of %d "
+				"on MS5837 device, aborting test.",
+				oversampling_rate.val1);
+		return;
+	}
+
+	while (1) {
+		struct sensor_value temp;
+		struct sensor_value press;
+
+		sensor_sample_fetch(dev);
+		sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
+		sensor_channel_get(dev, SENSOR_CHAN_PRESS, &press);
+
+		printf("Temperature: %d.%06d, Pressure: %d.%06d\n", temp.val1,
+		       temp.val2, press.val1, press.val2);
+
+		k_sleep(10000);
+	}
+}