syakir shamsudin / KeypadLib

hii soalan 3

Fork of KeypadLib by fitri ariffin

keypad.cpp@23:a09fc75f4ca7, 2018-06-04 (annotated)

Committer:
syakir93
Date:
Mon Jun 04 14:30:19 2018 +0000
Revision:
23:a09fc75f4ca7
Parent:
14:d6592dac4365 
soalan 3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rlanghbv 1:fa689a04c361 1 /* Copyright (c) 2015 Rune Langøy
DimiterK 0:1fa357ea3fcc 2
DimiterK 0:1fa357ea3fcc 3 Permission is hereby granted, free of charge, to any person obtaining a copy
DimiterK 0:1fa357ea3fcc 4 of this software and associated documentation files (the "Software"), to deal
DimiterK 0:1fa357ea3fcc 5 in the Software without restriction, including without limitation the rights
DimiterK 0:1fa357ea3fcc 6 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
DimiterK 0:1fa357ea3fcc 7 copies of the Software, and to permit persons to whom the Software is
DimiterK 0:1fa357ea3fcc 8 furnished to do so, subject to the following conditions:
DimiterK 0:1fa357ea3fcc 9
DimiterK 0:1fa357ea3fcc 10 The above copyright notice and this permission notice shall be included in
DimiterK 0:1fa357ea3fcc 11 all copies or substantial portions of the Software.
DimiterK 0:1fa357ea3fcc 12
DimiterK 0:1fa357ea3fcc 13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
DimiterK 0:1fa357ea3fcc 14 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
DimiterK 0:1fa357ea3fcc 15 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
DimiterK 0:1fa357ea3fcc 16 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
DimiterK 0:1fa357ea3fcc 17 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
DimiterK 0:1fa357ea3fcc 18 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
DimiterK 0:1fa357ea3fcc 19 THE SOFTWARE.
DimiterK 0:1fa357ea3fcc 20 */
DimiterK 0:1fa357ea3fcc 21
rlanghbv 1:fa689a04c361 22 /*
rlanghbv 1:fa689a04c361 23 Example is available in keypad.h
DimiterK 0:1fa357ea3fcc 24
rlanghbv 1:fa689a04c361 25 */
DimiterK 0:1fa357ea3fcc 26
DimiterK 0:1fa357ea3fcc 27 #include "mbed.h"
DimiterK 0:1fa357ea3fcc 28 #include "keypad.h"
DimiterK 0:1fa357ea3fcc 29
DimiterK 0:1fa357ea3fcc 30 using namespace mbed;
DimiterK 0:1fa357ea3fcc 31
rlanghbv 14:d6592dac4365 32 Keypad::Keypad(PinName col0, PinName col1, PinName col2, PinName col3,
rlanghbv 14:d6592dac4365 33 PinName row0,PinName row1, PinName row2, PinName row3):
rlanghbv 14:d6592dac4365 34 _cols(col0,col1,col2,col3) ,_rows(row0,row1,row2,row3) { }
rlanghbv 1:fa689a04c361 35
rlanghbv 14:d6592dac4365 36 void Keypad::enablePullUp()
rlanghbv 1:fa689a04c361 37 {
rlanghbv 14:d6592dac4365 38 _cols.mode(PullUp);
rlanghbv 1:fa689a04c361 39 }
DimiterK 0:1fa357ea3fcc 40
rlanghbv 1:fa689a04c361 41 bool Keypad::getKeyPressed()
rlanghbv 1:fa689a04c361 42 {
rlanghbv 14:d6592dac4365 43 _rows = 0; // Ground all keys
rlanghbv 1:fa689a04c361 44 if(_cols.read()==0xff) //Chk if key is pressed
rlanghbv 14:d6592dac4365 45 return false;
rlanghbv 14:d6592dac4365 46
rlanghbv 14:d6592dac4365 47 return true;
rlanghbv 1:fa689a04c361 48 }
rlanghbv 1:fa689a04c361 49
rlanghbv 1:fa689a04c361 50 int Keypad::getKeyIndex()
rlanghbv 1:fa689a04c361 51 {
rlanghbv 1:fa689a04c361 52 if (!getKeyPressed())
rlanghbv 14:d6592dac4365 53 return -1;
rlanghbv 14:d6592dac4365 54
rlanghbv 14:d6592dac4365 55 //Scan rows and cols and return switch index
rlanghbv 14:d6592dac4365 56 for(int i=0; i<4; i++) {
rlanghbv 14:d6592dac4365 57 _rows = ~(0x01 << i);
rlanghbv 14:d6592dac4365 58 for(int j=0; j<4; j++)
rlanghbv 14:d6592dac4365 59 if ( !( (_cols.read()>> j )& 0x1 ))
rlanghbv 14:d6592dac4365 60 return j + (i*4);
rlanghbv 14:d6592dac4365 61 }
DimiterK 0:1fa357ea3fcc 62 return -1;
rlanghbv 14:d6592dac4365 63 }
DimiterK 0:1fa357ea3fcc 64
rlanghbv 1:fa689a04c361 65 char Keypad::getKey()
rlanghbv 1:fa689a04c361 66 {
rlanghbv 14:d6592dac4365 67 int k = getKeyIndex();
rlanghbv 14:d6592dac4365 68 if(k != -1)
rlanghbv 14:d6592dac4365 69 return keys[k];
rlanghbv 14:d6592dac4365 70
rlanghbv 14:d6592dac4365 71 return 0;
DimiterK 0:1fa357ea3fcc 72 }