4x4 Keypad easy to use library that pollis the interface width pullups
Dependents: 4x4KeyBoardExample xoxokey 4x4KeyBoardExample ProgettoCassaforte ... more
Fork of keypad by
Simple library for reading a 4x4 keypad width at ability to use internal pullups
Import program
00001 #include "mbed.h" 00002 #include "keypad.h" 00003 00004 Serial pc(USBTX, USBRX); 00005 00006 00007 int main() { 00008 // c0 c1 c2 c3 r0 r1 r2 r3 00009 Keypad keypad( PC_3,PC_2,PA_0,PA_1,PA_4,PB_0,PC_1,PC_0 ); 00010 00011 keypad.enablePullUp(); 00012 char key; 00013 pc.printf("Please touch a key on the keypad\n\r"); 00014 while (1) 00015 { 00016 key = keypad.getKey(); 00017 if(key != KEY_RELEASED) 00018 { 00019 pc.printf("%c\r\n",key); 00020 wait(0.6); 00021 } 00022 } 00023 }
Import library
Public Member Functions |
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Keypad (PinName col0, PinName col1, PinName col2, PinName col3, PinName row0, PinName row1, PinName row2, PinName row3) | |
Create a 4x4 (col, row) or 4x4 keypad interface
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char | getKey () |
Returns the letter of the pressed key
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bool | getKeyPressed () |
Detects if any key was pressed.
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void | enablePullUp () |
Enables internal PullUp resistors on the coloums pins.
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Protected Member Functions |
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int | getKeyIndex () |
return the index value representating the pressed key
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Diff: keypad.h
- Revision:
- 0:1fa357ea3fcc
- Child:
- 1:fa689a04c361
--- /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