Replaced assert keyword with RunTimeException on setPulseWidth method…

… and associated interface and javadoc

IOIOLibCore/src/main/java/ioio/lib/api/PwmOutput.java

@@ -108,17 +108,17 @@ public interface PwmOutput extends Closeable {
      * the high-time within a single period of the signal. For relative control
      * of the pulse with, consider using {@link #setDutyCycle(float)}.
      *
-     * @param pulseWidthUs The pulse width, in microsecond units.
+     * @param pulseWidthUs The pulse width, in microsecond units. Must be larger than zero.
      * @throws ConnectionLostException The connection to the IOIO has been lost.
      * @throws RuntimeException pulseWidthUs must take values larger than zero.
      * @see #setDutyCycle(float)
      */
-    void setPulseWidth(int pulseWidthUs) throws ConnectionLostException;
+    void setPulseWidth(int pulseWidthUs) throws ConnectionLostException, RuntimeException;
 
     /**
      * The same as {@link #setPulseWidth(int)}, but with sub-microsecond
      * precision.
      */
     void setPulseWidth(float pulseWidthUs)
-            throws ConnectionLostException;
+            throws ConnectionLostException, RuntimeException;
 }

IOIOLibCore/src/main/java/ioio/lib/impl/PwmImpl.java

@@ -67,14 +67,16 @@ public void setDutyCycle(float dutyCycle) throws ConnectionLostException, Runtim
     }
 
     @Override
-    public void setPulseWidth(int pulseWidthUs) throws ConnectionLostException {
+    public void setPulseWidth(int pulseWidthUs) throws ConnectionLostException, RuntimeException {
         setPulseWidth((float) pulseWidthUs);
     }
 
     @Override
     public void setPulseWidth(float pulseWidthUs)
-            throws ConnectionLostException {
-        assert (pulseWidthUs >= 0);
+            throws ConnectionLostException, RuntimeException {
+        if (pulseWidthUs < 0) {
+            throw new RuntimeException("pulseWidthUs must be larger than 0. A pulseWidthUs of " + pulseWidthUs + " was given.");
+        }
         float p = pulseWidthUs / baseUs_;
         setPulseWidthInClocks(p);
     }