Davide Luongo
scan a 3x4 keypad with softaware pulldown resistors by polling it continuously.
keypad3x4.h@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 | /*Simple example |
| fangoman91 | 1:b8305e120e11 | 28 | |
| fangoman91 | 1:b8305e120e11 | 29 | #include "mbed.h" |
| fangoman91 | 1:b8305e120e11 | 30 | #include "keypad.h" |
| fangoman91 | 1:b8305e120e11 | 31 | |
| fangoman91 | 1:b8305e120e11 | 32 | Serial pc(USBTX, USBRX); |
| fangoman91 | 1:b8305e120e11 | 33 | Keypad telepad(p13,p14,p15,p17,p18,p19,p20); |
| fangoman91 | 1:b8305e120e11 | 34 | |
| fangoman91 | 1:b8305e120e11 | 35 | int main(void){ |
| fangoman91 | 1:b8305e120e11 | 36 | char key; |
| fangoman91 | 1:b8305e120e11 | 37 | pc.printf("Enter codes\n\r"); |
| fangoman91 | 1:b8305e120e11 | 38 | while(1){ |
| fangoman91 | 1:b8305e120e11 | 39 | key = telepad.getKey(); |
| fangoman91 | 1:b8305e120e11 | 40 | if(key != KEY_RELEASED){ |
| fangoman91 | 1:b8305e120e11 | 41 | pc.printf("%c\n",key); |
| fangoman91 | 1:b8305e120e11 | 42 | wait(0.6); |
| fangoman91 | 1:b8305e120e11 | 43 | } |
| fangoman91 | 1:b8305e120e11 | 44 | } |
| fangoman91 | 1:b8305e120e11 | 45 | }*/ |
| fangoman91 | 1:b8305e120e11 | 46 | |
| fangoman91 | 1:b8305e120e11 | 47 | #ifndef KEYPAD3x4_H |
| fangoman91 | 1:b8305e120e11 | 48 | #define KEYPAD3x4_H |
| fangoman91 | 1:b8305e120e11 | 49 | |
| fangoman91 | 1:b8305e120e11 | 50 | #include "DigitalIn.h" |
| fangoman91 | 1:b8305e120e11 | 51 | #include "BusOut.h" |
| fangoman91 | 1:b8305e120e11 | 52 | |
| fangoman91 | 1:b8305e120e11 | 53 | |
| fangoman91 | 1:b8305e120e11 | 54 | namespace mbed |
| fangoman91 | 1:b8305e120e11 | 55 | { |
| fangoman91 | 1:b8305e120e11 | 56 | const char NO_KEY = '\0'; |
| fangoman91 | 1:b8305e120e11 | 57 | #define KEY_RELEASED NO_KEY |
| fangoman91 | 1:b8305e120e11 | 58 | const int keys[12] = {'1','2','3','4','5','6','7','8','9','*','0','#',}; |
| fangoman91 | 1:b8305e120e11 | 59 | class Keypad |
| fangoman91 | 1:b8305e120e11 | 60 | { |
| fangoman91 | 1:b8305e120e11 | 61 | public: |
| fangoman91 | 1:b8305e120e11 | 62 | Keypad(PinName col1,PinName col2,PinName col3,PinName row1,PinName row2,PinName row3,PinName row4); |
| fangoman91 | 1:b8305e120e11 | 63 | char getKey(); |
| fangoman91 | 1:b8305e120e11 | 64 | protected: |
| fangoman91 | 1:b8305e120e11 | 65 | int getKeyIndex(); |
| fangoman91 | 1:b8305e120e11 | 66 | DigitalIn _col1,_col2,_col3; |
| fangoman91 | 1:b8305e120e11 | 67 | BusOut _rows; |
| fangoman91 | 1:b8305e120e11 | 68 | }; |
| fangoman91 | 1:b8305e120e11 | 69 | } |
| fangoman91 | 1:b8305e120e11 | 70 | #endif |