Reiko Randoja
Quadrature decoder
Diff: qed.h
- Revision:
- 0:0e8cb3139868
diff -r 000000000000 -r 0e8cb3139868 qed.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/qed.h Mon Jul 29 20:25:05 2013 +0000
@@ -0,0 +1,28 @@
+#ifndef QED_H
+#define QED_H
+
+#include "mbed.h"
+
+#define PREV_MASK 0x1 //Mask for the previous state in determining direction of rotation.
+#define CURR_MASK 0x2 //Mask for the current state in determining direction of rotation.
+#define INVALID 0x3 //XORing two states where both bits have changed.
+
+class QED {
+public:
+ QED(PinName channelA, PinName channelB);
+
+ int read();
+
+private:
+ void decode();
+
+ InterruptIn interruptA;
+ InterruptIn interruptB;
+
+ volatile int pulses;
+
+ int prevState;
+ int currState;
+};
+
+#endif
\ No newline at end of file
