53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* 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) {
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return _SFR_IO8(pin >> 4) & _BV(pin & 0xf);
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}
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