4x4 matrix keypad
Fork of Keypad by
Keypad.h
- Committer:
- microHenri
- Date:
- 2018-05-17
- Revision:
- 3:82aae98732cd
- Parent:
- 2:a3545b56bdd7
File content as of revision 3:82aae98732cd:
/* * Mbed Library / Akizuki AE-KIT45-KEYPAD4X3 * http://akizukidenshi.com/catalog/g/gK-12229/ * * Copyright (c) 2017 Kenji Arai / JH1PJL * http://www.page.sannet.ne.jp/kenjia/index.html * http://mbed.org/users/kenjiArai/ * Created: September 27th, 2017 * Revised: December 22nd, 2017 * * 4x4 Fork: Henri Clarke * May 17th, 2018 */ #ifndef KEYPAD_H #define KEYPAD_H #include "mbed.h" #define CHNG_CNT 3 /** * @code * #include "mbed.h" * #include "Keypad.h" * * // every 2ms runs 6uS for key detection(CPU occupancy is 0.3%/Nucleo-F446RE) * // output port W X Y Z * // Input A * 0 # (D) * // Input B 7 8 9 (C) * // Input C 4 5 6 (B) * // Input D 1 2 3 (A) * // W X Y Z A B C D OUT(WXYZ), IN(ABCD) * Keypad key(D10, D9, D8, D7, D6, D5, D4); * * // define key number at main routine * char *const key_table = "?*7410852#963"; // key_table[0]=? is not used! * * int main() { * uint32_t key_num; * while(true) { * while ((key_num = key.read()) != 0){ * printf("%c\r\n", *(key_table + key_num)); * } * wait(1.0); * } * } * @endcode */ class Keypad { public: /** 4x4 keypad interface: * @param key input port A,B,C,D * @param key output(scan) port W,X,Y,Z */ Keypad(PinName kw, PinName kx, PinName ky, PinName kz, PinName ka, PinName kb, PinName kc, PinName kd); /** Read key data into buffer * @param none * @return key number by ASCII code */ uint8_t read(void); protected: DigitalIn *k_in[4]; DigitalOut *k_out[4]; Ticker tk; // key control enum State {Off_state, Off_to_on_transient, On_state, On_to_off_transient}; volatile State key_state[4][4]; volatile int8_t key_transent_cntr[4][4]; void key_scan(void); // buffer control #define BF_SIZE 16 uint8_t read_addr; uint8_t write_addr; uint8_t buf[BF_SIZE]; void bf_put (char dat); int8_t bf_get (void); }; #endif // KEYPAD_H