Added initial interfaces and some sensors implementing them

include/interfaces/iPressure.hpp

@@ -0,0 +1,81 @@
+/*
+ * Author: Mihai Stefanescu <mihai.stefanescu@rinftech.com>
+ * Copyright (c) 2018 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 <stdexcept>
+
+namespace upm
+{
+  enum class PressureUnit { PA, BAR, ATM, TORR, PSI };
+/**
+* @brief Interface for Pressure Measuring Sensors
+*/
+  class iPressure
+  {
+  public:
+    virtual ~iPressure() {}
+    virtual float getPressure() = 0;
+
+    /**
+     * Convert pressure value from Pascal(default) to one
+     * of the following:
+     *
+     * 1. Bar
+     * 2. Standard atmosphere
+     * 3. Torr
+     * 4. Pounds per square inch
+     *
+     * @param paValue Pa pressure value
+     * @param unit The pressure unit for the conversion.
+     * @return The converted pressure value
+     */
+    static float convertPaTo(float paValue, PressureUnit unit)
+    {
+      float convertedValue = paValue;
+
+      switch (unit)
+      {
+        case PressureUnit::PA:
+          break;
+        case PressureUnit::BAR:
+          convertedValue *= 0.00001f;
+          break;
+        case PressureUnit::ATM:
+          convertedValue *= 0.0000098692f;
+          break;
+        case PressureUnit::TORR:
+          convertedValue *= 0.0075006f;
+          break;
+        case PressureUnit::PSI:
+          convertedValue *= 0.0001450377f;
+          break;
+        default:
+          throw std::invalid_argument("invalid pressure unit");
+      }
+
+      return convertedValue;
+    }
+  };
+}