Davide Luongo / keypad3x4

scan a 3x4 keypad with softaware pulldown resistors by polling it continuously.

Fork of keypad by Dimiter K

keypad.cpp@0:1fa357ea3fcc, 2010-11-06 (annotated)

Committer:
DimiterK
Date:
Sat Nov 06 14:36:22 2010 +0000
Revision:
0:1fa357ea3fcc

        

        
Who changed what in which revision?

        

            
                
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/*	 Copyright (c) 2010 Dimiter Kentri





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Permission is hereby granted, free of charge, to any person obtaining a copy





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of this software and associated documentation files (the "Software"), to deal





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in the Software without restriction, including without limitation the rights





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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell





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copies of the Software, and to permit persons to whom the Software is





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furnished to do so, subject to the following conditions:





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The above copyright notice and this permission notice shall be included in





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all copies or substantial portions of the Software.





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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR





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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,





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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE





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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER





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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,





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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN





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THE SOFTWARE.





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*/





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/*Simple example





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#include "mbed.h"





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#include "keypad.h"





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Serial pc(USBTX, USBRX); 





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Keypad telepad(p13,p14,p15,p16,p17,p18,p19,p20);





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int main(void){





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  char key;





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  pc.printf("Enter codes\n\r");





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  while(1){ 





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	key = telepad.getKey();	





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	if(key != KEY_RELEASED){





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	pc.printf("%c\n",key);





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	wait(0.6);





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	 }





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	}





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}		*/





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#include "mbed.h"





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#include "keypad.h"





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using namespace mbed;





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Keypad::Keypad(PinName col1, PinName col2, PinName col3, PinName col4, PinName row1,PinName row2, PinName row3, PinName row4): _col1(col1),





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    _col2(col2),_col3(col3),_col4(col4),_rows(row1,row2,row3,row4)    {    





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}     





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int Keypad::getKeyIndex(){





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    for(int k=0; k<4; k++) {





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            _rows = 0;





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    }    





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    for(int i=0; i<4; i++) {





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            _rows = 1 << i;     





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        for(int j=0; j<4;j++){         





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            if (_col1)





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                return 1+(i*4);





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            else if (_col2)





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                return 2+(i*4);





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               else if (_col3)





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                   return 3+(i*4); 





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            else if (_col4)





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                return 4+(i*4);            





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        }





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    }    





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    return -1;





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}          





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char Keypad::getKey(){





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int k = getKeyIndex();    





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if(k != -1)





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    return  keys[k-1];





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 else 





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 return 0;





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}