pwm: Fully Functional.

* C++ example included

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>

examples/cycle-pwm3.cpp

@@ -0,0 +1,24 @@
+#include <unistd.h>
+
+#include "maa.h"
+
+int
+main ()
+{
+  maa::PWM pwm(0, 3);
+  pwm.period_us(200);
+  pwm.enable(1);
+
+  float value = 0.0f;
+
+  while(1) {
+    value = value + 0.01f;
+    pwm.write(value);
+    usleep(50000);
+    if (value >= 1.0f) {
+        value = 0.0f;
+    }
+    float output = pwm.read();
+  }
+  return 0;
+}