mh
/
qmk_firmware
mirror of https://github.com/qmk/qmk_firmware/


								#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;

								}