scan a 3x4 keypad with softaware pulldown resistors by polling it continuously.
Fork of keypad by
keypad3x4.h
- Committer:
- fangoman91
- Date:
- 2015-05-08
- Revision:
- 1:b8305e120e11
File content as of revision 1:b8305e120e11:
//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. */ /*Simple example #include "mbed.h" #include "keypad.h" Serial pc(USBTX, USBRX); Keypad telepad(p13,p14,p15,p17,p18,p19,p20); int main(void){ char key; pc.printf("Enter codes\n\r"); while(1){ key = telepad.getKey(); if(key != KEY_RELEASED){ pc.printf("%c\n",key); wait(0.6); } } }*/ #ifndef KEYPAD3x4_H #define KEYPAD3x4_H #include "DigitalIn.h" #include "BusOut.h" namespace mbed { const char NO_KEY = '\0'; #define KEY_RELEASED NO_KEY const int keys[12] = {'1','2','3','4','5','6','7','8','9','*','0','#',}; class Keypad { public: Keypad(PinName col1,PinName col2,PinName col3,PinName row1,PinName row2,PinName row3,PinName row4); char getKey(); protected: int getKeyIndex(); DigitalIn _col1,_col2,_col3; BusOut _rows; }; } #endif