Initial implementation of iAcceleration

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

src/bma220/bma220.cxx

@@ -174,6 +174,18 @@ std::vector<float> BMA220::getAccelerometer()
   return v;
 }
 
+std::vector<float> BMA220::getAcceleration()
+{
+  std::vector<float> v(3);
+
+  update();
+  v[0] = m_accelX / m_accelScale;
+  v[1] = m_accelY / m_accelScale;
+  v[2] = m_accelZ / m_accelScale;
+
+  return v;
+}
+
 uint8_t BMA220::getChipID()
 {
   return readReg(REG_CHIPID);

src/bma220/bma220.hpp

@@ -29,6 +29,8 @@
 #include <mraa/i2c.hpp>
 #include <mraa/gpio.hpp>
 
+#include <interfaces/iAcceleration.hpp>
+
 #define BMA220_I2C_BUS 0
 #define BMA220_DEFAULT_ADDR 0x0a
 
@@ -68,7 +70,7 @@ namespace upm {
    * @snippet bma220.cxx Interesting
    */
 
-  class BMA220 {
+  class BMA220: virtual public iAcceleration {
   public:
 
     // NOTE: reserved registers must not be written into or read from.
@@ -547,6 +549,13 @@ namespace upm {
      */
     std::vector<float> getAccelerometer();
 
+    /**
+     * get acceleration values
+     * 
+     * @return stl vector of size 3 representing the 3 axis
+     */
+    virtual std::vector<float> getAcceleration();
+
     /**
      * set the filtering configuration
      *