cpp_headers: Renamed C++ headers from .h -> .hpp

To make room for UPM C and C++ sensor code to coexist, all UPM
C++ headers have been renamed from h -> hpp.  This commit contains
updates to documentation, includes, cmake collateral, examples, and
swig interface files.

    * Renamed all cxx/cpp header files which contain the string
    'copyright intel' from .h -> .hpp (if not already hpp).

    * Replaced all references to .h with .hpp in documentation,
    source files, cmake collateral, example code, and swig interface
    files.

    * Replaced cmake variable module_h with module_hpp.

    * Intentionally left upm.h since this file currently does not
    contain code (documentation only).

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/gas/gas.hpp

@@ -0,0 +1,104 @@
+/*
+ * Author: Brendan Le Foll <brendan.le.foll@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 <string>
+#include <mraa/aio.hpp>
+
+struct thresholdContext {
+    long averageReading;
+    long runningAverage;
+    int averagedOver;
+};
+
+namespace upm {
+/**
+ * @brief Gas Sensor library
+ *
+ * Library for air quality and gas detecting sensors. Base class Gas provides buffered
+ * sampling, threshold checking, basic printing function, and standard read function.
+ *
+ * @defgroup gas libupm-gas
+ * @ingroup seeed analog gaseous eak hak
+ */
+class Gas {
+    public:
+        /**
+         * Instantiates a Gas object
+         *
+         * @param gasPin Pin where gas is connected
+         */
+        Gas(int gasPin);
+
+        /**
+         * Gas object destructor
+         */
+        ~Gas();
+
+        /**
+         * Gets samples from the gas sensor according to the provided window and
+         * number of samples
+         *
+         * @param freqMS Time between each sample (in milliseconds)
+         * @param numberOfSamples Number of sample to sample for this window
+         * @param buffer Buffer with sampled data
+         */
+        virtual int getSampledWindow (unsigned int freqMS, int numberOfSamples, uint16_t * buffer);
+
+        /**
+         * Given the sampled buffer, this method returns TRUE/FALSE if the threshold
+         * is reached
+         *
+         * @param ctx Threshold context
+         * @param threshold Sample threshold
+         * @param buffer Buffer with samples
+         * @param len Buffer length
+         */
+        virtual int findThreshold (thresholdContext* ctx, unsigned int threshold, uint16_t * buffer, int len);
+
+        /**
+         * Returns average data for the sampled window
+         *
+         * @param ctx Threshold context
+         */
+        virtual int getSampledData (thresholdContext* ctx);
+
+        /**
+         * Returns one sample from the sensor
+         */
+        virtual int getSample ();
+
+        /**
+         *
+         * Prints a running average of the threshold context
+         *
+         * @param ctx Threshold context
+         */
+        virtual void printGraph (thresholdContext* ctx, uint8_t resolution);
+
+    protected:
+        mraa::Aio    m_aio;
+};
+
+}