1 /* Copyright 2016 Wez Furlong
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, either version 2 of the License, or
6 * (at your option) any later version.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 // Some helpers for controlling gpio pins
21 PinDirectionInput = 0,
22 PinDirectionOutput = 1,
27 // ex: pinMode(B0, PinDirectionOutput);
28 static inline void pinMode(uint8_t pin, int mode) {
29 uint8_t bv = _BV(pin & 0xf);
30 if (mode == PinDirectionOutput) {
31 _SFR_IO8((pin >> 4) + 1) |= bv;
33 _SFR_IO8((pin >> 4) + 1) &= ~bv;
34 _SFR_IO8((pin >> 4) + 2) &= ~bv;
38 // ex: digitalWrite(B0, PinLevelHigh);
39 static inline void digitalWrite(uint8_t pin, int mode) {
40 uint8_t bv = _BV(pin & 0xf);
41 if (mode == PinLevelHigh) {
42 _SFR_IO8((pin >> 4) + 2) |= bv;
44 _SFR_IO8((pin >> 4) + 2) &= ~bv;
48 // Return true if the pin is HIGH
50 static inline bool digitalRead(uint8_t pin) {
51 return _SFR_IO8(pin >> 4) & _BV(pin & 0xf);