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/**
* @file keypad.h
* Manages the GPIO keypad
*
* Copyright (C) 2018 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef KEYPAD_H_
#define KEYPAD_H_
#include <stdint.h>
#define K_UP 0x18
#define K_DOWN 0x19
#define K_LEFT 0x1B
#define K_RIGHT 0x1A
/**
* Initializes GPIO for the keypad.
* Starts a task to poll the buttons. Must be called before any keypad reading.
*/
void keypad_init(void);
void keypad_start(void);
/**
* Reads the last pressed key on the keypad.
* This driver keeps an 8 key buffer for key presses.
* @return the pressed key (as the character it represents), zero if no presses
*/
int keypad_get(void);
#endif // KEYPAD_H_
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