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/* Copyright 2016 Wez Furlong
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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 2 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 <http://www.gnu.org/licenses/>.
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*/ |
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#pragma once |
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// Some helpers for controlling gpio pins
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#include <avr/io.h> |
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enum { |
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PinDirectionInput = 0, |
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PinDirectionOutput = 1, |
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PinLevelHigh = 1, |
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PinLevelLow = 0, |
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}; |
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// ex: pinMode(B0, PinDirectionOutput);
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static inline void pinMode(uint8_t pin, int mode) { |
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uint8_t bv = _BV(pin & 0xf); |
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if (mode == PinDirectionOutput) { |
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_SFR_IO8((pin >> 4) + 1) |= bv; |
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} else { |
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_SFR_IO8((pin >> 4) + 1) &= ~bv; |
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_SFR_IO8((pin >> 4) + 2) &= ~bv; |
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} |
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} |
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// ex: digitalWrite(B0, PinLevelHigh);
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static inline void digitalWrite(uint8_t pin, int mode) { |
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uint8_t bv = _BV(pin & 0xf); |
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if (mode == PinLevelHigh) { |
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_SFR_IO8((pin >> 4) + 2) |= bv; |
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} else { |
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_SFR_IO8((pin >> 4) + 2) &= ~bv; |
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} |
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} |
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// Return true if the pin is HIGH
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// digitalRead(B0)
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static inline bool digitalRead(uint8_t pin) { return _SFR_IO8(pin >> 4) & _BV(pin & 0xf); } |
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