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 |
|
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
. |
|
char | getKey () |
Returns the letter of the pressed key
. |
|
bool | getKeyPressed () |
Detects if any key was pressed.
|
|
void | enablePullUp () |
Enables internal PullUp resistors on the coloums pins.
|
|
Protected Member Functions |
|
int | getKeyIndex () |
return the index value representating the pressed key
|
keypad.cpp@1:fa689a04c361, 2015-09-19 (annotated)
- Committer:
- rlanghbv
- Date:
- Sat Sep 19 07:51:21 2015 +0000
- Revision:
- 1:fa689a04c361
- Parent:
- 0:1fa357ea3fcc
- Child:
- 14:d6592dac4365
First commit
Who changed what in which revision?
User | Revision | Line number | New 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 | 1:fa689a04c361 | 32 | Keypad::Keypad(PinName col0, PinName col1, PinName col2, PinName col3, |
rlanghbv | 1:fa689a04c361 | 33 | PinName row0,PinName row1, PinName row2, PinName row3): |
rlanghbv | 1:fa689a04c361 | 34 | _cols(col0,col1,col2,col3) ,_rows(row0,row1,row2,row3) { } |
rlanghbv | 1:fa689a04c361 | 35 | |
rlanghbv | 1:fa689a04c361 | 36 | void Keypad::enablePullUp() |
rlanghbv | 1:fa689a04c361 | 37 | { |
rlanghbv | 1:fa689a04c361 | 38 | _cols.mode(PullUp); |
rlanghbv | 1:fa689a04c361 | 39 | } |
DimiterK | 0:1fa357ea3fcc | 40 | |
rlanghbv | 1:fa689a04c361 | 41 | bool Keypad::getKeyPressed() |
rlanghbv | 1:fa689a04c361 | 42 | { |
rlanghbv | 1:fa689a04c361 | 43 | _rows = 0; // Ground all keys |
rlanghbv | 1:fa689a04c361 | 44 | if(_cols.read()==0xff) //Chk if key is pressed |
rlanghbv | 1:fa689a04c361 | 45 | return false; |
rlanghbv | 1:fa689a04c361 | 46 | |
rlanghbv | 1:fa689a04c361 | 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 | 1:fa689a04c361 | 53 | return -1; |
rlanghbv | 1:fa689a04c361 | 54 | |
rlanghbv | 1:fa689a04c361 | 55 | //Scan rows and cols and return switch index |
rlanghbv | 1:fa689a04c361 | 56 | for(int i=0; i<4; i++) |
rlanghbv | 1:fa689a04c361 | 57 | { _rows = ~(0x01 << i); |
rlanghbv | 1:fa689a04c361 | 58 | for(int j=0; j<4;j++) |
rlanghbv | 1:fa689a04c361 | 59 | if ( !( (_cols.read()>> j )& 0x1 )) |
rlanghbv | 1:fa689a04c361 | 60 | return j + (i*4); |
DimiterK | 0:1fa357ea3fcc | 61 | } |
DimiterK | 0:1fa357ea3fcc | 62 | return -1; |
DimiterK | 0:1fa357ea3fcc | 63 | } |
DimiterK | 0:1fa357ea3fcc | 64 | |
rlanghbv | 1:fa689a04c361 | 65 | char Keypad::getKey() |
rlanghbv | 1:fa689a04c361 | 66 | { |
rlanghbv | 1:fa689a04c361 | 67 | int k = getKeyIndex(); |
rlanghbv | 1:fa689a04c361 | 68 | if(k != -1) |
rlanghbv | 1:fa689a04c361 | 69 | return keys[k]; |
rlanghbv | 1:fa689a04c361 | 70 | |
rlanghbv | 1:fa689a04c361 | 71 | return 0; |
DimiterK | 0:1fa357ea3fcc | 72 | } |