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