Diff: CRotaryEncoder.h

Revision:

0:56f636261771

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CRotaryEncoder.h	Tue Nov 09 20:14:32 2010 +0000
@@ -0,0 +1,61 @@
+#ifndef CROTENC_H_INCLUDED
+#define CROTENC_H_INCLUDED
+
+#include "mbed.h"
+
+
+/* This Class handles a rotary encoder like the one from Pollin electronic (Panasonic EVEP...).
+ * It uses two pins, one creating an interrupt on change.
+ * Rotation direction is determined by checking the state of the other pin.
+ *
+ * Operating the encoder changes an internal integer value that can be read
+ * by Get() or the operator int() functions.
+ * A new value can be set by Set(value) or opperator=.
+ *
+ * Autor: Thomas Raab (Raabinator)
+ *
+ * Dent steady point     !     !     !
+ *                    +-----+     +-----+
+ * pinA (interrupt)   |     |     |     |
+ *                  --+     +-----+     +---
+ *                      +-----+     +-----+
+ * pinB                 |     |     |     |
+ *                  ----+     +-----+     +-
+ *                           --> C.W
+ * CW:  increases position value
+ * CCW: decreases position value
+ *
+ * changelog:
+ *
+ * 09. Nov. 2010
+ *     First version published.
+ *
+ */
+
+
+
+class CRotaryEncoder
+{
+    public:
+    CRotaryEncoder(PinName pinA, PinName pinB);
+    ~CRotaryEncoder();
+    
+    int Get(void);
+    inline operator int() { return Get(); }
+
+    void Set(int value);
+    inline CRotaryEncoder& operator= ( int  value ) { Set(value); return *this; }
+
+    private:
+    InterruptIn     *m_pinA;
+    DigitalIn       *m_pinB;
+    volatile int    m_position;
+    
+    void rise(void);
+    void fall(void);
+    
+
+};
+
+
+#endif