mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-12-05 01:15:19 +00:00
212 lines
5.0 KiB
C
212 lines
5.0 KiB
C
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/**
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* Backlighting code for PS2AVRGB boards (ATMEGA32A)
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* Kenneth A. (github.com/krusli | krusli.me)
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*/
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#include "backlight.h"
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#include "quantum.h"
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#include <avr/pgmspace.h>
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#include <avr/interrupt.h>
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#include "backlight_custom.h"
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#include "breathing_custom.h"
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// DEBUG
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#include <stdlib.h>
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#include <stdio.h>
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// Port D: digital pins of the AVR chipset
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#define NUMLOCK_PORT (1 << 0) // D0
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#define CAPSLOCK_PORT (1 << 1) // D1
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#define BACKLIGHT_PORT (1 << 4) // D4
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#define SCROLLLOCK_PORT (1 << 6) // D6
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#define TIMER_CLK_DIV64 0x03 ///< Timer clocked at F_CPU/64
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#define TIMER1PRESCALE TIMER_CLK_DIV64 ///< timer 1 prescaler default
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#define TIMER_PRESCALE_MASK 0x07 ///< Timer Prescaler Bit-Mask
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#define PWM_MAX 0xFF
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#define TIMER_TOP 255 // 8 bit PWM
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extern backlight_config_t backlight_config;
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/**
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* References
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* Port Registers: https://www.arduino.cc/en/Reference/PortManipulation
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* TCCR1A: https://electronics.stackexchange.com/questions/92350/what-is-the-difference-between-tccr1a-and-tccr1b
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* Timers: http://www.avrbeginners.net/architecture/timers/timers.html
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* 16-bit timer setup: http://sculland.com/ATmega168/Interrupts-And-Timers/16-Bit-Timer-Setup/
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* PS2AVRGB firmware: https://github.com/showjean/ps2avrU/tree/master/firmware
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*/
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// @Override
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// turn LEDs on and off depending on USB caps/num/scroll lock states.
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__attribute__ ((weak))
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void led_set_user(uint8_t usb_led) {
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if (usb_led & (1 << USB_LED_NUM_LOCK)) {
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// turn on
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DDRD |= NUMLOCK_PORT;
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PORTD |= NUMLOCK_PORT;
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} else {
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// turn off
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DDRD &= ~NUMLOCK_PORT;
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PORTD &= ~NUMLOCK_PORT;
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}
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if (usb_led & (1 << USB_LED_CAPS_LOCK)) {
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DDRD |= CAPSLOCK_PORT;
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PORTD |= CAPSLOCK_PORT;
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} else {
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DDRD &= ~CAPSLOCK_PORT;
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PORTD &= ~CAPSLOCK_PORT;
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}
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if (usb_led & (1 << USB_LED_SCROLL_LOCK)) {
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DDRD |= SCROLLLOCK_PORT;
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PORTD |= SCROLLLOCK_PORT;
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} else {
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DDRD &= ~SCROLLLOCK_PORT;
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PORTD &= ~SCROLLLOCK_PORT;
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}
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}
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#ifdef BACKLIGHT_ENABLE
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// sets up Timer 1 for 8-bit PWM
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void timer1PWMSetup(void) { // NOTE ONLY CALL THIS ONCE
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// default 8 bit mode
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TCCR1A &= ~(1 << 1); // cbi(TCCR1A,PWM11); <- set PWM11 bit to HIGH
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TCCR1A |= (1 << 0); // sbi(TCCR1A,PWM10); <- set PWM10 bit to LOW
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// clear output compare value A
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// outb(OCR1AH, 0);
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// outb(OCR1AL, 0);
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// clear output comparator registers for B
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OCR1BH = 0; // outb(OCR1BH, 0);
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OCR1BL = 0; // outb(OCR1BL, 0);
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}
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bool is_init = false;
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void timer1Init(void) {
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// timer1SetPrescaler(TIMER1PRESCALE)
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// set to DIV/64
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(TCCR1B) = ((TCCR1B) & ~TIMER_PRESCALE_MASK) | TIMER1PRESCALE;
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// reset TCNT1
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TCNT1H = 0; // outb(TCNT1H, 0);
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TCNT1L = 0; // outb(TCNT1L, 0);
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// TOIE1: Timer Overflow Interrupt Enable (Timer 1);
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TIMSK |= _BV(TOIE1); // sbi(TIMSK, TOIE1);
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is_init = true;
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}
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void timer1UnInit(void) {
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// set prescaler back to NONE
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(TCCR1B) = ((TCCR1B) & ~TIMER_PRESCALE_MASK) | 0x00; // TIMERRTC_CLK_STOP
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// disable timer overflow interrupt
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TIMSK &= ~_BV(TOIE1); // overflow bit?
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setPWM(0);
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is_init = false;
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}
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// handle TCNT1 overflow
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//! Interrupt handler for tcnt1 overflow interrupt
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ISR(TIMER1_OVF_vect, ISR_NOBLOCK)
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{
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// sei();
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// handle breathing here
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#ifdef BACKLIGHT_BREATHING
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if (is_breathing()) {
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custom_breathing_handler();
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}
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#endif
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}
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// enable timer 1 PWM
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// timer1PWMBOn()
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void timer1PWMBEnable(void) {
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// turn on channel B (OC1B) PWM output
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// set OC1B as non-inverted PWM
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TCCR1A |= _BV(COM1B1);
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TCCR1A &= ~_BV(COM1B0);
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}
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// disable timer 1 PWM
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// timer1PWMBOff()
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void timer1PWMBDisable(void) {
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TCCR1A &= ~_BV(COM1B1);
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TCCR1A &= ~_BV(COM1B0);
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}
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void enableBacklight(void) {
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DDRD |= BACKLIGHT_PORT; // set digital pin 4 as output
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PORTD |= BACKLIGHT_PORT; // set digital pin 4 to high
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}
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void disableBacklight(void) {
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// DDRD &= ~BACKLIGHT_PORT; // set digital pin 4 as input
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PORTD &= ~BACKLIGHT_PORT; // set digital pin 4 to low
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}
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void startPWM(void) {
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timer1Init();
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timer1PWMBEnable();
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enableBacklight();
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}
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void stopPWM(void) {
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timer1UnInit();
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disableBacklight();
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timer1PWMBDisable();
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}
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void b_led_init_ports(void) {
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/* turn backlight on/off depending on user preference */
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#if BACKLIGHT_ON_STATE == 0
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// DDRx register: sets the direction of Port D
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// DDRD &= ~BACKLIGHT_PORT; // set digital pin 4 as input
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PORTD &= ~BACKLIGHT_PORT; // set digital pin 4 to low
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#else
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DDRD |= BACKLIGHT_PORT; // set digital pin 4 as output
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PORTD |= BACKLIGHT_PORT; // set digital pin 4 to high
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#endif
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timer1PWMSetup();
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startPWM();
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#ifdef BACKLIGHT_BREATHING
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breathing_enable();
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#endif
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}
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void b_led_set(uint8_t level) {
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if (level > BACKLIGHT_LEVELS) {
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level = BACKLIGHT_LEVELS;
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}
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setPWM((int)(TIMER_TOP * (float) level / BACKLIGHT_LEVELS));
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}
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// called every matrix scan
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void b_led_task(void) {
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// do nothing for now
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}
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void setPWM(uint16_t xValue) {
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if (xValue > TIMER_TOP) {
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xValue = TIMER_TOP;
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}
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OCR1B = xValue; // timer1PWMBSet(xValue);
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}
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#endif // BACKLIGHT_ENABLE
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