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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 K0 (uint16_t)(1 << 0)
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#define K1 (uint16_t)(1 << 1)
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#define K2 (uint16_t)(1 << 2)
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#define K3 (uint16_t)(1 << 3)
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#define K4 (uint16_t)(1 << 4)
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#define K5 (uint16_t)(1 << 5)
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#define K6 (uint16_t)(1 << 6)
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#define K7 (uint16_t)(1 << 7)
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#define K8 (uint16_t)(1 << 8)
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#define K9 (uint16_t)(1 << 9)
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#define KS (uint16_t)(1 << 10)
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#define KP (uint16_t)(1 << 11)
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/**
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* Initializes GPIO for the keypad. Must be called before any keypad reading.
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*/
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void keypad_init(void);
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/**
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* Reads the state of the keypad and returns it.
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* @return the keypad's state
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*/
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uint16_t keypad_get(void);
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/**
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* Tests if the given key is currently pressed, returning non-zero if it is.
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* @return non-zero if pressed
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*/
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uint8_t keypad_isdown(uint16_t);
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#endif // KEYPAD_H_
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