diff -r daf26b083899 -r b43536c064f6 lib/keypad/Keypad.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/keypad/Keypad.h	Mon Jan 28 21:51:45 2019 +0100
@@ -0,0 +1,53 @@
+
+#ifndef KEYPAD_H
+#define KEYPAD_H
+
+#include "mbed.h"
+#include "rtos.h"
+#include <vector>
+
+
+
+typedef Callback<void(uint8_t, uint8_t)> keyevent_callback_t;
+
+class Keypad {
+public:
+  Keypad(uint8_t nRows, DigitalIn rows[],
+	 uint8_t nColumns, DigitalOut cols[],
+	 int debounce_ms=20);
+    
+  /** Destructor
+   */
+  ~Keypad();
+  
+  void attach(const keyevent_callback_t& kp_callback=NULL,
+	      const keyevent_callback_t& kr_callback=NULL);
+  
+  void start(void);
+  void stop(void);
+  
+  
+protected:
+  std::vector<DigitalIn> _rows;
+  std::vector<DigitalOut> _columns;
+  int              _debounce;  // miliseconds
+
+  void _kp();
+  void _kr();
+  void _keyPressed(int row);
+  void _keyReleased(int row);
+  void run();
+  
+private:
+  keyevent_callback_t _kp_callback;
+  keyevent_callback_t _kr_callback;
+  bool _started;
+  Thread _loop;
+  //tloop.start(&loop);
+  uint8_t _nrows;
+  uint8_t _ncols;
+  uint8_t *_keys;
+};
+
+
+#endif // KEYPAD_H