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