Added iVDiv interface

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@gmail.com>

include/interfaces/iVDiv.hpp

@@ -0,0 +1,45 @@
+/*
+ * 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
+
+namespace upm
+{
+/**
+ * @brief Interface for Voltage Dividing sensors
+*/
+  class iVDiv
+  {
+  public:
+    virtual ~iVDiv() {}
+
+    /**
+     * Gets the conversion value from the sensor
+     *
+     * @return ADC conversion value
+     */
+    virtual unsigned int getValue() = 0;
+
+  };
+}

src/grovevdiv/grovevdiv.cxx

@@ -56,13 +56,17 @@ unsigned int GroveVDiv::value(unsigned int samples)
       if (sum == -1) return 0;
       usleep(2000);
     }
-        
+
   return (sum / samples);
 }
 
+unsigned int GroveVDiv::getValue()
+{
+    return GroveVDiv::value(1);
+}
+
 float GroveVDiv::computedValue(uint8_t gain, unsigned int val, int vref, int res)
 {
   return ((float(gain) * float(val) * float(vref) / float(res)) / 1000.0);
 
 }
-

src/grovevdiv/grovevdiv.hpp

@@ -27,6 +27,7 @@
 #include <iostream>
 #include <stdint.h>
 #include <mraa/aio.h>
+#include <interfaces/iVDiv.hpp>
 
 // reference voltage in millivolts
 #define GROVEVDIV_VREF  4980
@@ -59,7 +60,7 @@ namespace upm {
    * @image html grovevdiv.jpg
    * @snippet grovevdiv.cxx Interesting
    */
-  class GroveVDiv {
+  class GroveVDiv : virtual public iVDiv {
   public:
     /**
      * Grove Voltage Divider sensor constructor
@@ -81,6 +82,13 @@ namespace upm {
      */
     unsigned int value(unsigned int samples);
 
+    /**
+     * Gets the conversion value from the sensor
+     *
+     * @return ADC conversion value
+     */
+     virtual unsigned int getValue();
+
     /**
      * Computes the measured voltage
      *

src/vdiv/vdiv.cxx

@@ -56,13 +56,17 @@ unsigned int VDiv::value(unsigned int samples)
       if (sum == -1) return 0;
       usleep(2000);
     }
-        
+
   return (sum / samples);
 }
 
+unsigned int VDiv::getValue()
+{
+    return VDiv::value(1);
+}
+
 float VDiv::computedValue(uint8_t gain, unsigned int val, int vref, int res)
 {
   return ((float(gain) * float(val) * float(vref) / float(res)) / 1000.0);
 
 }
-

src/vdiv/vdiv.hpp

@@ -27,6 +27,7 @@
 #include <iostream>
 #include <stdint.h>
 #include <mraa/aio.h>
+#include <interfaces/iVDiv.hpp>
 
 // reference voltage in millivolts
 #define VDIV_VREF  4980
@@ -58,7 +59,7 @@ namespace upm {
    * @image html vdiv.jpg
    * @snippet vdiv.cxx Interesting
    */
-  class VDiv {
+  class VDiv : virtual public iVDiv {
   public:
     /**
      * Voltage Divider sensor constructor
@@ -80,6 +81,13 @@ namespace upm {
      */
     unsigned int value(unsigned int samples);
 
+    /**
+     * Gets the conversion value from the sensor
+     *
+     * @return ADC conversion value
+     */
+    virtual unsigned int getValue();
+
     /**
      * Computes the measured voltage
      *