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Diffstat (limited to 'keyboards/ymd75/backlight.c')
| -rw-r--r-- | keyboards/ymd75/backlight.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/keyboards/ymd75/backlight.c b/keyboards/ymd75/backlight.c new file mode 100644 index 000000000..1f5e19638 --- /dev/null +++ b/keyboards/ymd75/backlight.c @@ -0,0 +1,215 @@ +/** + * 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) // 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; + } + /* + 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 |