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- /**
- * Backlighting code for PS2AVRGB boards (ATMEGA32A)
- * Kenneth A. (github.com/krusli | krusli.me)
- Modified by Wayne K Jones (github.com/WarmCatUK) 2018
- */
-
- #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 << 2) // 2nd pin of Port D (digital)
- #define CAPSLOCK_PORT (1 << 1) // 1st pin
- #define BACKLIGHT_PORT (1 << 4) // D4
- //#define SCROLLLOCK_PORT (1 << 6) // D6
-
- #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.
- __attribute__ ((weak))
- 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;
- }
- /*
- 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
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