scan a 3x4 keypad with softaware pulldown resistors by polling it continuously.
Fork of keypad by
Diff: keypad.h
- Revision:
- 0:1fa357ea3fcc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/keypad.h Sat Nov 06 14:36:22 2010 +0000 @@ -0,0 +1,53 @@ +/* Copyright (c) 2010 Dimiter Kentri + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. +*/ + +#ifndef KEYPAD_H +#define KEYPAD_H + +#include "DigitalIn.h" +#include "BusOut.h" + + +namespace mbed{ + +const char NO_KEY = '\0'; +#define KEY_RELEASED NO_KEY + + + +const int keys[16] = {'1','2','3','A', + '4','5','6','B', + '7','8','9','C', + '*','0','#','D'}; + +class Keypad{ + public: + Keypad(PinName col1, PinName col2, PinName col3, PinName col4, PinName row1,PinName row2, PinName row3, PinName row4); + int getKeyIndex(); + char getKey(); + + protected: + DigitalIn _col1,_col2,_col3,_col4; + BusOut _rows; +}; + +} +#endif