keyboards/duck/jetfire/backlight_led.c

   1 /*
   2 Copyright 2016 Ralf Schmitt <ralf@bunkertor.net>
   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 This program is distributed in the hope that it will be useful,
   8 but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 GNU General Public License for more details.
  11 You should have received a copy of the GNU General Public License
  12 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  13 */
  14
  15 #include <avr/interrupt.h>
  16 #include <avr/io.h>
  17 #include <stdbool.h>
  18 #include <util/delay.h>
  19 #include <stdint.h>
  20 #include "backlight_led.h"
  21 #include "quantum.h"
  22 // #include "led.h"
  23
  24
  25 #define T1H  900
  26 #define T1L  600
  27 #define T0H  400
  28 #define T0L  900
  29 #define RES 6000
  30
  31 #define NS_PER_SEC (1000000000L)
  32 #define CYCLES_PER_SEC (F_CPU)
  33 #define NS_PER_CYCLE (NS_PER_SEC / CYCLES_PER_SEC)
  34 #define NS_TO_CYCLES(n) ((n) / NS_PER_CYCLE)
  35
  36 void send_bit_d4(bool bitVal)
  37 {
  38   if(bitVal) {
  39     asm volatile (
  40         "sbi %[port], %[bit] \n\t"
  41         ".rept %[onCycles] \n\t"
  42         "nop \n\t"
  43         ".endr \n\t"
  44         "cbi %[port], %[bit] \n\t"
  45         ".rept %[offCycles] \n\t"
  46         "nop \n\t"
  47         ".endr \n\t"
  48         ::
  49         [port]      "I" (_SFR_IO_ADDR(PORTD)),
  50         [bit]       "I" (4),
  51         [onCycles]  "I" (NS_TO_CYCLES(T1H) - 2),
  52         [offCycles] "I" (NS_TO_CYCLES(T1L) - 2));
  53   } else {
  54     asm volatile (
  55         "sbi %[port], %[bit] \n\t"
  56         ".rept %[onCycles] \n\t"
  57         "nop \n\t"
  58         ".endr \n\t"
  59         "cbi %[port], %[bit] \n\t"
  60         ".rept %[offCycles] \n\t"
  61         "nop \n\t"
  62         ".endr \n\t"
  63         ::
  64         [port]      "I" (_SFR_IO_ADDR(PORTD)),
  65         [bit]       "I" (4),
  66         [onCycles]  "I" (NS_TO_CYCLES(T0H) - 2),
  67         [offCycles] "I" (NS_TO_CYCLES(T0L) - 2));
  68   }
  69 }
  70
  71 void send_bit_d6(bool bitVal)
  72 {
  73   if(bitVal) {
  74     asm volatile (
  75         "sbi %[port], %[bit] \n\t"
  76         ".rept %[onCycles] \n\t"
  77         "nop \n\t"
  78         ".endr \n\t"
  79         "cbi %[port], %[bit] \n\t"
  80         ".rept %[offCycles] \n\t"
  81         "nop \n\t"
  82         ".endr \n\t"
  83         ::
  84         [port]      "I" (_SFR_IO_ADDR(PORTD)),
  85         [bit]       "I" (6),
  86         [onCycles]  "I" (NS_TO_CYCLES(T1H) - 2),
  87         [offCycles] "I" (NS_TO_CYCLES(T1L) - 2));
  88   } else {
  89     asm volatile (
  90         "sbi %[port], %[bit] \n\t"
  91         ".rept %[onCycles] \n\t"
  92         "nop \n\t"
  93         ".endr \n\t"
  94         "cbi %[port], %[bit] \n\t"
  95         ".rept %[offCycles] \n\t"
  96         "nop \n\t"
  97         ".endr \n\t"
  98         ::
  99         [port]      "I" (_SFR_IO_ADDR(PORTD)),
 100         [bit]       "I" (6),
 101         [onCycles]  "I" (NS_TO_CYCLES(T0H) - 2),
 102         [offCycles] "I" (NS_TO_CYCLES(T0L) - 2));
 103   }
 104 }
 105
 106 void show(void)
 107 {
 108   _delay_us((RES / 1000UL) + 1);
 109 }
 110
 111 void send_value(uint8_t byte, enum Device device)
 112 {
 113   for(uint8_t b = 0; b < 8; b++) {
 114     if(device == Device_STATELED) {
 115       send_bit_d4(byte & 0b10000000);
 116     }
 117     if(device == Device_PCBRGB) {
 118       send_bit_d6(byte & 0b10000000);
 119     }
 120     byte <<= 1;
 121   }
 122 }
 123
 124 void send_color(uint8_t r, uint8_t g, uint8_t b, enum Device device)
 125 {
 126   send_value(g, device);
 127   send_value(r, device);
 128   send_value(b, device);
 129 }