Added iGas interface

Signed-off-by: Serban Waltter <serban.waltter@rinftech.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/micsv89/CMakeLists.txt

@@ -2,4 +2,5 @@ set (libname "micsv89")
 set (libdescription "Low-power Air Quality Sensor")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
+set (module_iface iGas.hpp)
 upm_module_init(mraa)

src/micsv89/micsv89.cxx

@@ -66,6 +66,11 @@ float MICSV89::co2equ() {
     return ((rx_buf[0] - 13) * (1600/229) + 400);
 }
 
+float MICSV89::getConcentration() {
+    update();
+    return ((rx_buf[0] - 13) * (1600/229) + 400);
+}
+
 int MICSV89::vocshort() {
     return rx_buf[1];
 }

src/micsv89/micsv89.hpp

@@ -27,6 +27,8 @@
 #include <iostream>
 #include <string>
 
+#include <interfaces/iGas.hpp>
+
 namespace mraa { class I2c;}
 
 namespace upm {
@@ -59,7 +61,7 @@ namespace upm {
    * @image html micsv89.jpg
    * @snippet micsv89.cxx Interesting
    */
-    class MICSV89 {
+    class MICSV89: virtual public iGas {
         public:
             /**
              * MICSV89 constructor
@@ -87,6 +89,11 @@ namespace upm {
              */
             float co2equ();
 
+            /**
+             * Returns the  CO2 equivalent value.
+             */
+            float getConcentration();
+
             /**
              * Returns VOC Short value.
              */