Davide Luongo
scan a 3x4 keypad with softaware pulldown resistors by polling it continuously.
keypad3x4.cpp@1:b8305e120e11, 2015-05-08 (annotated)
- Committer:
- fangoman91
- Date:
- Fri May 08 06:50:54 2015 +0000
- Revision:
- 1:b8305e120e11
Dimiter Kentry update. Eliminate one column and add software pulldown resistors
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| fangoman91 | 1:b8305e120e11 | 1 | |
| fangoman91 | 1:b8305e120e11 | 2 | |
| fangoman91 | 1:b8305e120e11 | 3 | //Dimiter Kentri update |
| fangoman91 | 1:b8305e120e11 | 4 | |
| fangoman91 | 1:b8305e120e11 | 5 | |
| fangoman91 | 1:b8305e120e11 | 6 | /* Copyright (c) 2010 Dimiter Kentri |
| fangoman91 | 1:b8305e120e11 | 7 | |
| fangoman91 | 1:b8305e120e11 | 8 | Permission is hereby granted, free of charge, to any person obtaining a copy |
| fangoman91 | 1:b8305e120e11 | 9 | of this software and associated documentation files (the "Software"), to deal |
| fangoman91 | 1:b8305e120e11 | 10 | in the Software without restriction, including without limitation the rights |
| fangoman91 | 1:b8305e120e11 | 11 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| fangoman91 | 1:b8305e120e11 | 12 | copies of the Software, and to permit persons to whom the Software is |
| fangoman91 | 1:b8305e120e11 | 13 | furnished to do so, subject to the following conditions: |
| fangoman91 | 1:b8305e120e11 | 14 | |
| fangoman91 | 1:b8305e120e11 | 15 | The above copyright notice and this permission notice shall be included in |
| fangoman91 | 1:b8305e120e11 | 16 | all copies or substantial portions of the Software. |
| fangoman91 | 1:b8305e120e11 | 17 | |
| fangoman91 | 1:b8305e120e11 | 18 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| fangoman91 | 1:b8305e120e11 | 19 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| fangoman91 | 1:b8305e120e11 | 20 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| fangoman91 | 1:b8305e120e11 | 21 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| fangoman91 | 1:b8305e120e11 | 22 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| fangoman91 | 1:b8305e120e11 | 23 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| fangoman91 | 1:b8305e120e11 | 24 | THE SOFTWARE. |
| fangoman91 | 1:b8305e120e11 | 25 | */ |
| fangoman91 | 1:b8305e120e11 | 26 | |
| fangoman91 | 1:b8305e120e11 | 27 | #include "mbed.h" |
| fangoman91 | 1:b8305e120e11 | 28 | #include "keypad3x4.h" |
| fangoman91 | 1:b8305e120e11 | 29 | |
| fangoman91 | 1:b8305e120e11 | 30 | using namespace mbed; |
| fangoman91 | 1:b8305e120e11 | 31 | |
| fangoman91 | 1:b8305e120e11 | 32 | 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) |
| fangoman91 | 1:b8305e120e11 | 33 | { |
| fangoman91 | 1:b8305e120e11 | 34 | _col1.mode(PullUp); |
| fangoman91 | 1:b8305e120e11 | 35 | _col2.mode(PullUp); |
| fangoman91 | 1:b8305e120e11 | 36 | _col3.mode(PullUp); |
| fangoman91 | 1:b8305e120e11 | 37 | } |
| fangoman91 | 1:b8305e120e11 | 38 | |
| fangoman91 | 1:b8305e120e11 | 39 | int Keypad::getKeyIndex() |
| fangoman91 | 1:b8305e120e11 | 40 | { |
| fangoman91 | 1:b8305e120e11 | 41 | _rows = 0; |
| fangoman91 | 1:b8305e120e11 | 42 | for(int i=0; i<4; i++) |
| fangoman91 | 1:b8305e120e11 | 43 | { |
| fangoman91 | 1:b8305e120e11 | 44 | _rows = 1 << i; |
| fangoman91 | 1:b8305e120e11 | 45 | for(int j=0; j<4;j++) |
| fangoman91 | 1:b8305e120e11 | 46 | { |
| fangoman91 | 1:b8305e120e11 | 47 | if (_col1) |
| fangoman91 | 1:b8305e120e11 | 48 | return 1+(i*3); |
| fangoman91 | 1:b8305e120e11 | 49 | else if (_col2) |
| fangoman91 | 1:b8305e120e11 | 50 | return 2+(i*3); |
| fangoman91 | 1:b8305e120e11 | 51 | else if (_col3) |
| fangoman91 | 1:b8305e120e11 | 52 | return 3+(i*3); |
| fangoman91 | 1:b8305e120e11 | 53 | } |
| fangoman91 | 1:b8305e120e11 | 54 | } |
| fangoman91 | 1:b8305e120e11 | 55 | return 11; |
| fangoman91 | 1:b8305e120e11 | 56 | } |
| fangoman91 | 1:b8305e120e11 | 57 | |
| fangoman91 | 1:b8305e120e11 | 58 | char Keypad::getKey() |
| fangoman91 | 1:b8305e120e11 | 59 | { |
| fangoman91 | 1:b8305e120e11 | 60 | int k = getKeyIndex(); |
| fangoman91 | 1:b8305e120e11 | 61 | if(k != 11) |
| fangoman91 | 1:b8305e120e11 | 62 | return keys[k-1]; |
| fangoman91 | 1:b8305e120e11 | 63 | else |
| fangoman91 | 1:b8305e120e11 | 64 | return 0; |
| fangoman91 | 1:b8305e120e11 | 65 | } |