orphan/lightpad/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  * FN1       PB0 (low)
  24  * FN2       PB5 (low)
  25  * FN3       PB4 (low)
  26  * FN4       PD7 (low)
  27  * REAR      PD6 (high)
  28  * NUMPAD    PB2 (high)
  29  * NUMLOCK   PB1 (low)
  30  */
  31 void backlight_init_ports() {
  32     DDRB |= (1<<0) | (1<<1) | (1<<2) | (1<<4) | (1<<5);
  33     DDRD |= (1<<6) | (1<<7);
  34
  35     backlight_disable_numlock();
  36 }
  37
  38 void backlight_set(uint8_t level) {
  39     (level & BACKLIGHT_FN1) ? backlight_enable_fn1() : backlight_disable_fn1();
  40     (level & BACKLIGHT_FN2) ? backlight_enable_fn2() : backlight_disable_fn2();
  41     (level & BACKLIGHT_FN3) ? backlight_enable_fn3() : backlight_disable_fn3();
  42     (level & BACKLIGHT_FN4) ? backlight_enable_fn4() : backlight_disable_fn4();
  43     (level & BACKLIGHT_NUMPAD) ? backlight_enable_numpad() : backlight_disable_numpad();
  44     (level & BACKLIGHT_REAR) ? backlight_enable_rear() : backlight_disable_rear();
  45 }
  46
  47 void backlight_enable_fn1() {
  48     PORTB &= ~(1<<0);
  49 }
  50
  51 void backlight_disable_fn1() {
  52     PORTB |= (1<<0);
  53 }
  54
  55 void backlight_invert_fn1() {
  56     PORTB ^= (1<<0);
  57 }
  58
  59 void backlight_enable_fn2() {
  60     PORTB &= ~(1<<5);
  61 }
  62
  63 void backlight_disable_fn2() {
  64     PORTB |= (1<<5);
  65 }
  66
  67 void backlight_invert_fn2() {
  68     PORTB ^= (1<<5);
  69 }
  70
  71 void backlight_enable_fn3() {
  72     PORTB &= ~(1<<4);
  73 }
  74
  75 void backlight_disable_fn3() {
  76     PORTB |= (1<<4);
  77 }
  78
  79 void backlight_invert_fn3() {
  80     PORTB ^= (1<<4);
  81 }
  82
  83 void backlight_enable_fn4() {
  84     PORTD &= ~(1<<7);
  85 }
  86
  87 void backlight_disable_fn4() {
  88     PORTD |= (1<<7);
  89 }
  90
  91 void backlight_invert_fn4() {
  92     PORTD ^= (1<<7);
  93 }
  94
  95 void backlight_enable_numpad() {
  96     PORTB |= (1<<2);
  97 }
  98
  99 void backlight_disable_numpad() {
 100     PORTB &= ~(1<<2);
 101 }
 102
 103 void backlight_invert_numpad() {
 104     PORTB ^= (1<<2);
 105 }
 106
 107 void backlight_enable_numlock() {
 108     PORTB &= ~(1<<1);
 109 }
 110
 111 void backlight_disable_numlock() {
 112     PORTB |= (1<<1);
 113 }
 114
 115 void backlight_invert_numlock() {
 116     PORTB ^= (1<<1);
 117 }
 118
 119 void backlight_enable_rear() {
 120     PORTD |= (1<<6);
 121 }
 122
 123 void backlight_disable_rear() {
 124     PORTD &= ~(1<<6);
 125 }
 126
 127 void backlight_invert_rear() {
 128     PORTD ^= (1<<6);
 129 }