scan a 3x4 keypad with softaware pulldown resistors by polling it continuously.
Fork of keypad by
Diff: keypad3x4.cpp
- Revision:
- 1:b8305e120e11
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/keypad3x4.cpp Fri May 08 06:50:54 2015 +0000 @@ -0,0 +1,65 @@ + + +//Dimiter Kentri update + + +/* 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. +*/ + +#include "mbed.h" +#include "keypad3x4.h" + +using namespace mbed; + +Keypad::Keypad(PinName col1,PinName col2,PinName col3,PinName row1,PinName row2,PinName row3,PinName row4):_col1(col1),_col2(col2),_col3(col3),_rows(row1,row2,row3,row4) +{ + _col1.mode(PullUp); + _col2.mode(PullUp); + _col3.mode(PullUp); +} + +int Keypad::getKeyIndex() +{ + _rows = 0; + for(int i=0; i<4; i++) + { + _rows = 1 << i; + for(int j=0; j<4;j++) + { + if (_col1) + return 1+(i*3); + else if (_col2) + return 2+(i*3); + else if (_col3) + return 3+(i*3); + } + } + return 11; +} + +char Keypad::getKey() +{ + int k = getKeyIndex(); + if(k != 11) + return keys[k-1]; + else + return 0; +}