orphan/kmac/backlight.c

   1 /*
   2 Copyright 2013 Mathias Andersson <wraul@dbox.se>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include <avr/io.h>
  19 #include "backlight.h"
  20
  21 /* Backlight pin configuration
  22  * F-row: High PB1
  23  * W: Low PB4
  24  * A: Low PB2
  25  * S: Low PB3
  26  * D: Low PD7
  27  */
  28 void backlight_set(uint8_t level)
  29 {
  30     // Set as output.
  31     DDRB |= (1<<1) | (1<<2) | (1<<3) | (1<<4);
  32     DDRD |= (1<<7);
  33
  34     // F-row
  35     if(level & (1<<0))
  36     {
  37         PORTB |= (1<<1);
  38     }
  39     else
  40     {
  41         PORTB &= ~(1<<1);
  42     }
  43     // WASD
  44     if(level & (1<<1))
  45     {
  46         PORTB &= ~(1<<4);
  47         PORTB &= ~(1<<2);
  48         PORTB &= ~(1<<3);
  49         PORTD &= ~(1<<7);
  50     }
  51     else
  52     {
  53         PORTB |= (1<<4);
  54         PORTB |= (1<<2);
  55         PORTB |= (1<<3);
  56         PORTD |= (1<<7);
  57     }
  58 }