counter.h

00001 #ifndef counter_H
00002 #define counter_H
00003 
00004 /**
00005  * Includes
00006  */
00007 #include "mbed.h"
00008 
00009 /**
00010  * Simple counter
00011  */
00012 class counter {
00013 
00014 public:
00015 
00016     
00017     /**
00018      * Constructor.
00019      *
00020      * Attaches the encode function to the rise edge of
00021      * channel A.
00022      *
00023      * @param channelA mbed pin for counter input.
00024      */
00025     counter(PinName channelA);
00026 
00027     /**
00028      * Reset the encoder.
00029      *
00030      * Sets the pulses to zero.
00031      */
00032     void reset(void);
00033 
00034     /**
00035      * Read the number of pulses recorded by the encoder.
00036      *
00037      * @return Number of pulses which have occured.
00038      */
00039     int getPulses(void);
00040 
00041 private:
00042 
00043     /**
00044      * Update the pulse count.
00045      *
00046      * Called on every rising edge of channels A.
00047      *
00048      */
00049     void encode(void);
00050 
00051     InterruptIn channelA_;
00052     
00053     volatile int pulses_;
00054     
00055 };
00056 
00057 #endif /* counter_H */