keyboard/lightsaber/backlight.c

   1 /*
   2 Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
   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  *
  23  * Alphas    PB1 (high)
  24  * Numeric   PB2 (high)
  25  * Mod+Num   PB3 (high)
  26  * Backside  PD6 (high)
  27  * TopRight  PD7 (low)
  28  * F-Row     PE6 (high)
  29  */
  30
  31 void backlight_set(uint8_t level)
  32 {
  33     // Set as output.
  34     DDRB |= (1<<1) | (1<<2) | (1<<3);
  35     DDRD |= (1<<6) | (1<<7);
  36     DDRE |= (1<<6);
  37
  38     if (level & BACKLIGHT_ALPHA)
  39     {
  40         PORTB |= (1<<1);
  41     }
  42     else
  43     {
  44         PORTB &= ~(1<<1);
  45     }
  46     if (level & BACKLIGHT_NUMERIC)
  47     {
  48         PORTB |= (1<<2);
  49     }
  50     else
  51     {
  52         PORTB &= ~(1<<2);
  53     }
  54     if (level & BACKLIGHT_MODNUM)
  55     {
  56         PORTB |= (1<<3);
  57     }
  58     else
  59     {
  60         PORTB &= ~(1<<3);
  61     }
  62     if (level & BACKLIGHT_BACKSIDE)
  63     {
  64         PORTD |= (1<<6);
  65     }
  66     else
  67     {
  68         PORTD &= ~(1<<6);
  69     }
  70     if (level & BACKLIGHT_TOPRIGHT)
  71     {
  72         PORTD &= ~(1<<7);
  73     }
  74     else
  75     {
  76         PORTD |= (1<<7);
  77     }
  78     if (level & BACKLIGHT_FROW)
  79     {
  80         PORTE |= (1<<6);
  81     }
  82     else
  83     {
  84         PORTE &= ~(1<<6);
  85     }
  86 }