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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) // D0
#define CAPSLOCK_PORT (1 << 1) // D1
#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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