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.h
- Committer:
- rlanghbv
- Date:
- 2015-09-19
- Revision:
- 11:2176a5cf72b2
- Parent:
- 10:d66b1727615d
- Child:
- 12:5f7f56abfe36
File content as of revision 11:2176a5cf72b2:
/*mbed simple keypad library, using polling Copyright (c) 2015 Rune Langøy 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 char keys[16] = {'1','2','3','A', '4','5','6','B', '7','8','9','C', '*','0','#','D'}; /** * An simple polling-based interface to read a 4x4 keypad. * * The function getKey() reads the index of the pressed key * and returns the letter of the pressed key * * This work is a derivative of the works done by: * Dimiter Kentri in 2010 https://developer.mbed.org/users/DimiterK/code/keypad/ * and * Yoong Hor Meng in 2012 https://developer.mbed.org/users/yoonghm/code/keypad/ * * Example: * @code * #include "mbed.h" * #include "keypad.h" * * Serial pc(USBTX, USBRX); * Keypad keypad(D3,D4,D5,D6,D7,D8,D9,D10); * // Keypad keypad( PC_3,PC_2,PA_0,PA_1,PA_4,PB_0,PC_1,PC_0 ); // Tested on Nucleo303RE card * * int main(void) * { * keypad.enablePullUp(); * char key; * pc.printf("Please touch a key on the keypad\r\n"); * while(1) * { * key = keypad.getKey(); * if(key != KEY_RELEASED) * { * pc.printf("%c\r\n",key); * wait(0.2); * } * } * } * @endcode */ class Keypad{ public: /** @brief Create a 4x4 (col, row) or 4x4 keypad interface\n * \n * <pre> * | Col0 | Col1 | Col2 | Col3 \n * -------+------+------+------+----- \n * Row 0 | x | x | x | x \n * Row 1 | x | x | x | x \n * Row 2 | x | x | x | x \n * Row 3 | x | x | x | x \n * </pre> * * @param col<0..3> Row data lines * @param row<0..3> Column data lines */ Keypad(PinName col0, PinName col1, PinName col2, PinName col3, PinName row0,PinName row1, PinName row2, PinName row3); /** @brief Returns the letter of the pressed key \n * if no walid key was pressed\n * the value -1 is returned\n * * @return char - The pressed character or -1 if no char was pressed */ char getKey(); /** @brief Detects if any key was pressed * * @return bool - true is returned if any key is pressed */ bool getKeyPressed(); /** Enables internal PullUp resistors on the coloums pins * * @return void */ void enablePullUp(); protected: BusIn _cols; BusOut _rows; /** @brief return the index value \n * representating the pressed key \n * if no walid key was pressed \n * the value -1 is returned * * @return int */ int getKeyIndex(); }; } #endif