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Fork of keypad by
keypad.h
- Committer:
- yoonghm
- Date:
- 2012-01-30
- Revision:
- 0:2df66331c109
- Child:
- 1:b5eee44fa8a2
File content as of revision 0:2df66331c109:
/* mbed Keypad library, using user-defined interrupt callback * Copyright (c) 2012 Yoong Hor Meng * * 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 "mbed.h" #include "FPointer.h" /** * An interrupt-based interface to 4x4 keypad. * * On each key pressed on a keypad, the index of the key is passed to a * user-defined function. User is free to define what to be done with the * input. * * * @code * * #include "mbed.h" * #include "keypad.h" * * // Define your own keypad values * char Keytable[] = { '1', '2', '3', 'A', * '4', '5', '6', 'B', * '7', '8', '9', 'C', * '*', '0', '#', 'D' * }; * * uint32_t cbAfterInput(uint32_t index) { * printf("Index:%d => Key:%c\n", key, Keytable[index]); * return 0; * } * * int main() { * Keypad keypad(p25, p26, p27, p28, p21, p22, p23, p24); * keypad.CallAfterInput(&cbAfterInput); * keypad.Start(); * * while (1) { * wait_ms(100); * } * } * @endcode */ class Keypad { public: /** Create a Keypad interface * * @param row<3..0> Row data lines * @param col<3..0> Column data lines * @param debounce_ms Debounce in ms (Default to 20ms) */ Keypad(PinName row3, PinName row2, PinName row1, PinName row0, PinName col3, PinName col2, PinName col1, PinName col0, int debounce_ms = 20); /** Start the keypad interrupt routines */ void Start(void); /** Stop the keypad interrupt routines */ void Stop(void); /** User-defined function that to be called when a key is pressed * @param fptr A function pointer takes a uint32_t and * returns uint32_t */ void CallAfterInput(uint32_t (*fptr)(uint32_t)); protected: InterruptIn _row0; InterruptIn _row1; InterruptIn _row2; InterruptIn _row3; BusOut _cols; int _debounce; FPointer _input; // Called after each input void _callback(int row, InterruptIn &therow); void _cbRow0Rise(void); void _cbRow1Rise(void); void _cbRow2Rise(void); void _cbRow3Rise(void); void _setupRiseTrigger(void); void _dummy(void) { }; }; #endif // KEYPAD_H