keyboards/clueboard/17/17.c

   1 #include "17.h"
   2
   3 int pwm_level;
   4
   5 void matrix_init_kb(void) {
   6     // put your keyboard start-up code here
   7     // runs once when the firmware starts up
   8     matrix_init_user();
   9
  10     // JTAG disable for PORT F. write JTD bit twice within four cycles.
  11     MCUCR |= (1<<JTD);
  12     MCUCR |= (1<<JTD);
  13 };
  14
  15 void led_set_kb(uint8_t usb_led) {
  16     print("led_set\n");
  17 }
  18
  19 void backlight_init_ports(void) {
  20     // Set C7 to output
  21     DDRC |= (1<<7);
  22
  23     // Initialize the timer
  24     TC4H = 0x03;
  25     OCR4C = 0xFF;
  26     TCCR4A = 0b10000010;
  27     TCCR4B = 0b00000001;
  28 }
  29
  30 void backlight_set(uint8_t level) {
  31     // Determine the PWM level
  32     switch (level)
  33     {
  34         case 0:
  35             // 33%
  36             pwm_level = 0x54;
  37             break;
  38         case 1:
  39             // 66%
  40             pwm_level = 0xA8;
  41             break;
  42         case 2:
  43             // 100%
  44             pwm_level = 0xFF;
  45             break;
  46         case 3:
  47             // 0%
  48             pwm_level = 0x00;
  49             break;
  50         default:
  51             xprintf("Unknown level: %d\n", level);
  52     }
  53
  54     // Write the PWM level to the timer
  55     TC4H = pwm_level >> 8;
  56     OCR4A = 0xFF & pwm_level;
  57 }