Adafruitms1438: Add string based constructor

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/adafruitms1438/adafruitms1438.cxx

@@ -35,6 +35,21 @@ using namespace std;
 
 AdafruitMS1438::AdafruitMS1438(int bus, uint8_t address) :
   m_pca9685(new PCA9685(bus, address))
+{
+  initAdafruitMS1438();
+}
+
+AdafruitMS1438::AdafruitMS1438(std::string initStr) : m_pca9685(new PCA9685(initStr))
+{
+  initAdafruitMS1438();
+}
+
+AdafruitMS1438::~AdafruitMS1438()
+{
+  delete m_pca9685;
+}
+
+void AdafruitMS1438::initAdafruitMS1438()
 {
   setupPinMaps();
 
@@ -56,11 +71,6 @@ AdafruitMS1438::AdafruitMS1438(int bus, uint8_t address) :
   stepConfig(STEPMOTOR_M34, 200);
 }
 
-AdafruitMS1438::~AdafruitMS1438()
-{
-  delete m_pca9685;
-}
-
 void AdafruitMS1438::initClock(STEPMOTORS_T motor)
 {
   gettimeofday(&m_stepConfig[motor].startTime, NULL);

src/adafruitms1438/adafruitms1438.hpp

@@ -29,6 +29,7 @@
 #include <string>
 #include <mraa/i2c.h>
 #include <mraa/gpio.h>
+#include <mraa/initio.hpp>
 
 #include "pca9685.hpp"
 
@@ -104,11 +105,23 @@ namespace upm {
      */
     AdafruitMS1438(int bus, uint8_t address = ADAFRUITMS1438_DEFAULT_I2C_ADDR);
 
+    /**
+     * Instantiates AdafruitMS1438 based on a given string.
+     *
+     * @param initStr string containing specific information for AdafruitMS1438 initialization.
+     */
+    AdafruitMS1438(std::string initStr);
+
     /**
      * AdafruitMS1438 destructor
      */
     ~AdafruitMS1438();
 
+    /**
+     * AdafruitMS1438 initialization method
+     */
+    void initAdafruitMS1438();
+
     /**
      * Returns the number of milliseconds elapsed since initClock(...)
      * was last called.