Diff: PwmIn.h

Revision:

8:0574a5db1fc4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PwmIn.h	Fri Jan 31 04:33:44 2014 +0000
@@ -0,0 +1,55 @@
+
+#ifndef MBED_PWMIN_H
+#define MBED_PWMIN_H
+ 
+#include "mbed.h"
+ 
+/** PwmIn class to read PWM inputs
+ * 
+ * Uses InterruptIn to measure the changes on the input
+ * and record the time they occur
+ *
+ * @note uses InterruptIn, so not available on p19/p20
+ */
+class PwmIn {
+public:
+    /** Create a PwmIn
+     *
+     * @param p The pwm input pin (must support InterruptIn)
+     */ 
+    PwmIn(PinName p, float dutyMin, float dutyMax) ;
+    
+    /** Read the current period
+     *
+     * @returns the period in seconds
+     */
+    float period();
+    
+    /** Read the current pulsewidth
+     *
+     * @returns the pulsewidth in seconds
+     */
+    float pulsewidth();
+    
+    /** Read the current dutycycle
+     *
+     * @returns the dutycycle as a percentage, represented between 0.0-1.0
+     */
+    float dutycycle();
+    
+    float dutycyclescaledup();
+ 
+protected:        
+    void rise();
+    void fall();
+    
+    InterruptIn _p;
+    Timer _t;
+    int _pulsewidth, _period;
+    int _tmp;
+    float _dutyMin, _dutyMax, _dutyDelta;
+    
+    bool _risen;
+};
+ 
+#endif
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