quantum/pincontrol.h

   1 /* Copyright 2016 Wez Furlong
   2  *
   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.
   7  *
   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.
  12  *
  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/>.
  15  */
  16 #pragma once
  17 // Some helpers for controlling gpio pins
  18 #include <avr/io.h>
  19
  20 enum {
  21     PinDirectionInput  = 0,
  22     PinDirectionOutput = 1,
  23     PinLevelHigh       = 1,
  24     PinLevelLow        = 0,
  25 };
  26
  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;
  32     } else {
  33         _SFR_IO8((pin >> 4) + 1) &= ~bv;
  34         _SFR_IO8((pin >> 4) + 2) &= ~bv;
  35     }
  36 }
  37
  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;
  43     } else {
  44         _SFR_IO8((pin >> 4) + 2) &= ~bv;
  45     }
  46 }
  47
  48 // Return true if the pin is HIGH
  49 // digitalRead(B0)
  50 static inline bool digitalRead(uint8_t pin) { return _SFR_IO8(pin >> 4) & _BV(pin & 0xf); }