si7005: Initial Implementation Silicon Labs Si7005 humidity and temperature sensor

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

src/si7005/si7005.h

@@ -0,0 +1,143 @@
+/*
+ * Author: Scott Ware <scott.r.ware@intel.com>
+ * Copyright (c) 2014 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#pragma once
+
+#include <mraa/i2c.hpp>
+
+#include "upm/iTemperatureSensor.h"
+#include "upm/iHumiditySensor.h"
+
+/* ADDRESS AND NOT_FOUND VALUE */
+#define SI7005_ADDRESS                     ( 0x40 )
+#define SI7005_NOT_FOUND                   ( 0x00 )
+
+
+namespace upm {
+
+/**
+ * @brief Si7005 digital I2C humidity and temperature sensor library
+ * @defgroup si7005 libupm-si7005
+ * @ingroup i2c silabs temp itemperaturesensor
+ */
+
+/**
+ * @brief C++ API for SI7005 sensor (Humidity And Temperature Sensor)
+ *
+ * The Silicon Labs Si7005
+ * [SI7005](https://www.silabs.com/Support%20Documents/TechnicalDocs/Si7005.pdf)
+ * is a digital relative humidity and temperature sensor.
+ *
+ * @library si7005
+ * @sensor si7005
+ * @comname Silicon Labs Si7005 LED lighting controller
+ * @altname Si7005
+ * @type temp
+ * @man silabs
+ * @con i2c
+ * @if itemperaturesensor
+
+ */
+class SI7005 : public ITemperatureSensor, public IHumiditySensor {
+    public:
+        /**
+         * Instantiates a SI7005 object
+         *
+         * @param bus number of used bus
+         * @param devAddr address of used i2c device
+         * @param pin mraa gpio number for chip select pin
+         */
+        SI7005 (int bus, int pin);
+
+        /**
+         * SI7005 object destructor.
+         */
+        ~SI7005 ();
+
+        /**
+         * Get temperature measurement.
+         */
+        uint16_t getTemperatureRaw ();
+
+        /**
+         * Get temperature measurement.
+         */
+        int getTemperatureCelcius ();
+
+        /**
+         * Get relative humidity measurement.
+         */
+        uint16_t getHumidityRaw ();
+	
+        /**
+         * Get relative humidity measurement.
+         */
+        int getHumidityRelative ();
+        /**
+         * Returns whether the sensor is configured.
+         */
+        bool isConfigured();
+
+        /**
+         * Returns sensor module name
+         */
+        const char* getModuleName() { return "si7005"; }          
+
+        /**
+         * Detects the sensor to ensure it is connected as required.
+         */
+        bool isAvailable();
+
+        /**
+         * Enables the integrated heating element.
+         */
+        void enableHeater();
+
+        /**
+         * Disables the integrated heating element.
+         */
+        void disableHeater();
+
+        /**
+         * Enables fast conversion mode.
+         */
+        void enableFastConversionMode();
+
+        /**
+         * Enables fast conversion mode.
+         */
+        void disableFastConversionMode();
+
+    private:
+        int m_controlAddr;
+        int m_bus;
+        int m_pin;
+        mraa::I2c* m_i2c;
+        mraa::Result status;
+        uint8_t config_reg;
+        float last_temperature;
+
+        uint16_t getMeasurement(uint8_t configValue);
+};
+
+}