Reiko Randoja / QED

Quadrature decoder

Dependents:   Telliskivi2_2014

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qed.h

00001 #ifndef QED_H
00002 #define QED_H
00003 
00004 #include "mbed.h"
00005 
00006 #define PREV_MASK 0x1 //Mask for the previous state in determining direction of rotation.
00007 #define CURR_MASK 0x2 //Mask for the current state in determining direction of rotation.
00008 #define INVALID   0x3 //XORing two states where both bits have changed.
00009  
00010 class QED {
00011 public:
00012     QED(PinName channelA, PinName channelB);
00013  
00014     int read();
00015  
00016 private:
00017     void decode();
00018 
00019     InterruptIn interruptA;
00020     InterruptIn interruptB;
00021     
00022     volatile int pulses;
00023     
00024     int prevState;
00025     int currState;
00026 };
00027 
00028 #endif
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