mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-11-30 06:55:51 +00:00
44 lines
835 B
C
44 lines
835 B
C
#include "quantum.h"
|
|
|
|
int pwm_level;
|
|
|
|
void backlight_init_ports(void) {
|
|
// Set C7 to output
|
|
DDRC |= (1<<7);
|
|
|
|
// Initialize the timer
|
|
TC4H = 0x03;
|
|
OCR4C = 0xFF;
|
|
TCCR4A = 0b10000010;
|
|
TCCR4B = 0b00000001;
|
|
}
|
|
|
|
void backlight_set(uint8_t level) {
|
|
// Determine the PWM level
|
|
switch (level)
|
|
{
|
|
case 0:
|
|
// 33%
|
|
pwm_level = 0x54;
|
|
break;
|
|
case 1:
|
|
// 66%
|
|
pwm_level = 0xA8;
|
|
break;
|
|
case 2:
|
|
// 100%
|
|
pwm_level = 0xFF;
|
|
break;
|
|
case 3:
|
|
// 0%
|
|
pwm_level = 0x00;
|
|
break;
|
|
default:
|
|
xprintf("Unknown level: %d\n", level);
|
|
}
|
|
|
|
// Write the PWM level to the timer
|
|
TC4H = pwm_level >> 8;
|
|
OCR4A = 0xFF & pwm_level;
|
|
}
|