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diff --git a/keyboards/ymd96/backlight.c b/keyboards/ymd96/backlight.c
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+/**
+ * Backlighting code for PS2AVRGB boards (ATMEGA32A)
+ * Kenneth A. (github.com/krusli | krusli.me)
+ */
+
+#include "backlight.h"
+#include "quantum.h"
+
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+
+#include "backlight_custom.h"
+#include "breathing_custom.h"
+
+// DEBUG
+#include <stdlib.h>
+#include <stdio.h>
+
+// Port D: digital pins of the AVR chipset
+#define NUMLOCK_PORT (1 << 0) // 0th pin of Port D (digital)
+#define CAPSLOCK_PORT (1 << 1) // 1st pin
+#define BACKLIGHT_PORT (1 << 4) // 4th pin
+//#define SCROLLLOCK_PORT (1 << 6) // 6th pin
+
+#define TIMER_CLK_DIV64 0x03 ///< Timer clocked at F_CPU/64
+#define TIMER1PRESCALE TIMER_CLK_DIV64 ///< timer 1 prescaler default
+
+#define TIMER_PRESCALE_MASK 0x07 ///< Timer Prescaler Bit-Mask
+
+#define PWM_MAX 0xFF
+#define TIMER_TOP 255 // 8 bit PWM
+
+extern backlight_config_t backlight_config;
+
+/**
+ * References
+ * Port Registers: https://www.arduino.cc/en/Reference/PortManipulation
+ * TCCR1A: https://electronics.stackexchange.com/questions/92350/what-is-the-difference-between-tccr1a-and-tccr1b
+ * Timers: http://www.avrbeginners.net/architecture/timers/timers.html
+ * 16-bit timer setup: http://sculland.com/ATmega168/Interrupts-And-Timers/16-Bit-Timer-Setup/
+ * PS2AVRGB firmware: https://github.com/showjean/ps2avrU/tree/master/firmware
+ */
+
+// @Override
+// turn LEDs on and off depending on USB caps/num/scroll lock states.
+void led_set_user(uint8_t usb_led) {
+ if (usb_led & (1 << USB_LED_NUM_LOCK)) {
+ // turn on
+ DDRD |= NUMLOCK_PORT;
+ PORTD |= NUMLOCK_PORT;
+ } else {
+ // turn off
+ DDRD &= ~NUMLOCK_PORT;
+ PORTD &= ~NUMLOCK_PORT;
+ }
+
+ if (usb_led & (1 << USB_LED_CAPS_LOCK)) {
+ DDRD |= CAPSLOCK_PORT;
+ PORTD |= CAPSLOCK_PORT;
+ } else {
+ DDRD &= ~CAPSLOCK_PORT;
+ PORTD &= ~CAPSLOCK_PORT;
+ }
+
+ /* YMD96 does not have scroll lock led
+ if (usb_led & (1 << USB_LED_SCROLL_LOCK)) {
+ DDRD |= SCROLLLOCK_PORT;
+ PORTD |= SCROLLLOCK_PORT;
+ } else {
+ DDRD &= ~SCROLLLOCK_PORT;
+ PORTD &= ~SCROLLLOCK_PORT;
+ }*/
+}
+
+#ifdef BACKLIGHT_ENABLE
+
+// sets up Timer 1 for 8-bit PWM
+void timer1PWMSetup(void) { // NOTE ONLY CALL THIS ONCE
+ // default 8 bit mode
+ TCCR1A &= ~(1 << 1); // cbi(TCCR1A,PWM11); <- set PWM11 bit to HIGH
+ TCCR1A |= (1 << 0); // sbi(TCCR1A,PWM10); <- set PWM10 bit to LOW
+
+ // clear output compare value A
+ // outb(OCR1AH, 0);
+ // outb(OCR1AL, 0);
+
+ // clear output comparator registers for B
+ OCR1BH = 0; // outb(OCR1BH, 0);
+ OCR1BL = 0; // outb(OCR1BL, 0);
+}
+
+bool is_init = false;
+void timer1Init(void) {
+ // timer1SetPrescaler(TIMER1PRESCALE)
+ // set to DIV/64
+ (TCCR1B) = ((TCCR1B) & ~TIMER_PRESCALE_MASK) | TIMER1PRESCALE;
+
+ // reset TCNT1
+ TCNT1H = 0; // outb(TCNT1H, 0);
+ TCNT1L = 0; // outb(TCNT1L, 0);
+
+ // TOIE1: Timer Overflow Interrupt Enable (Timer 1);
+ TIMSK |= _BV(TOIE1); // sbi(TIMSK, TOIE1);
+
+ is_init = true;
+}
+
+void timer1UnInit(void) {
+ // set prescaler back to NONE
+ (TCCR1B) = ((TCCR1B) & ~TIMER_PRESCALE_MASK) | 0x00; // TIMERRTC_CLK_STOP
+
+ // disable timer overflow interrupt
+ TIMSK &= ~_BV(TOIE1); // overflow bit?
+
+ setPWM(0);
+
+ is_init = false;
+}
+
+
+// handle TCNT1 overflow
+//! Interrupt handler for tcnt1 overflow interrupt
+ISR(TIMER1_OVF_vect, ISR_NOBLOCK)
+{
+ // sei();
+ // handle breathing here
+ #ifdef BACKLIGHT_BREATHING
+ if (is_breathing()) {
+ custom_breathing_handler();
+ }
+ #endif
+
+ // TODO call user defined function
+}
+
+// enable timer 1 PWM
+// timer1PWMBOn()
+void timer1PWMBEnable(void) {
+ // turn on channel B (OC1B) PWM output
+ // set OC1B as non-inverted PWM
+ TCCR1A |= _BV(COM1B1);
+ TCCR1A &= ~_BV(COM1B0);
+}
+
+// disable timer 1 PWM
+// timer1PWMBOff()
+void timer1PWMBDisable(void) {
+ TCCR1A &= ~_BV(COM1B1);
+ TCCR1A &= ~_BV(COM1B0);
+}
+
+void enableBacklight(void) {
+ DDRD |= BACKLIGHT_PORT; // set digital pin 4 as output
+ PORTD |= BACKLIGHT_PORT; // set digital pin 4 to high
+}
+
+void disableBacklight(void) {
+ // DDRD &= ~BACKLIGHT_PORT; // set digital pin 4 as input
+ PORTD &= ~BACKLIGHT_PORT; // set digital pin 4 to low
+}
+
+void startPWM(void) {
+ timer1Init();
+ timer1PWMBEnable();
+ enableBacklight();
+}
+
+void stopPWM(void) {
+ timer1UnInit();
+ disableBacklight();
+ timer1PWMBDisable();
+}
+
+void b_led_init_ports(void) {
+ /* turn backlight on/off depending on user preference */
+ #if BACKLIGHT_ON_STATE == 0
+ // DDRx register: sets the direction of Port D
+ // DDRD &= ~BACKLIGHT_PORT; // set digital pin 4 as input
+ PORTD &= ~BACKLIGHT_PORT; // set digital pin 4 to low
+ #else
+ DDRD |= BACKLIGHT_PORT; // set digital pin 4 as output
+ PORTD |= BACKLIGHT_PORT; // set digital pin 4 to high
+ #endif
+
+ timer1PWMSetup();
+ startPWM();
+
+ #ifdef BACKLIGHT_BREATHING
+ breathing_enable();
+ #endif
+}
+
+void b_led_set(uint8_t level) {
+ if (level > BACKLIGHT_LEVELS) {
+ level = BACKLIGHT_LEVELS;
+ }
+
+ setPWM((int)(TIMER_TOP * (float) level / BACKLIGHT_LEVELS));
+}
+
+// called every matrix scan
+void b_led_task(void) {
+ // do nothing for now
+}
+
+void setPWM(uint16_t xValue) {
+ if (xValue > TIMER_TOP) {
+ xValue = TIMER_TOP;
+ }
+ OCR1B = xValue; // timer1PWMBSet(xValue);
+}
+
+#endif // BACKLIGHT_ENABLE