mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-11-23 17:06:52 +06:00
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
#include <stdint.h>
|
|
#include <avr/io.h>
|
|
#include <avr/interrupt.h>
|
|
#include <avr/pgmspace.h>
|
|
#include "led.h"
|
|
#include "sleep_led.h"
|
|
|
|
/* Software PWM
|
|
* ______ ______ __
|
|
* | ON |___OFF___| ON |___OFF___| ....
|
|
* |<-------------->|<-------------->|<- ....
|
|
* PWM period PWM period
|
|
*
|
|
* 256 interrupts/period[resolution]
|
|
* 64 periods/second[frequency]
|
|
* 256*64 interrupts/second
|
|
* F_CPU/(256*64) clocks/interrupt
|
|
*/
|
|
#define SLEEP_LED_TIMER_TOP F_CPU/(256*64)
|
|
|
|
void sleep_led_init(void)
|
|
{
|
|
/* Timer1 setup */
|
|
/* CTC mode */
|
|
TCCR1B |= _BV(WGM12);
|
|
/* Clock selelct: clk/1 */
|
|
TCCR1B |= _BV(CS10);
|
|
/* Set TOP value */
|
|
uint8_t sreg = SREG;
|
|
cli();
|
|
OCR1AH = (SLEEP_LED_TIMER_TOP>>8)&0xff;
|
|
OCR1AL = SLEEP_LED_TIMER_TOP&0xff;
|
|
SREG = sreg;
|
|
}
|
|
|
|
void sleep_led_enable(void)
|
|
{
|
|
/* Enable Compare Match Interrupt */
|
|
TIMSK1 |= _BV(OCIE1A);
|
|
}
|
|
|
|
void sleep_led_disable(void)
|
|
{
|
|
/* Disable Compare Match Interrupt */
|
|
TIMSK1 &= ~_BV(OCIE1A);
|
|
}
|
|
|
|
void sleep_led_toggle(void)
|
|
{
|
|
/* Disable Compare Match Interrupt */
|
|
TIMSK1 ^= _BV(OCIE1A);
|
|
}
|
|
|
|
|
|
/* Breathing Sleep LED brighness(PWM On period) table
|
|
* (64[steps] * 4[duration]) / 64[PWM periods/s] = 4 second breath cycle
|
|
*
|
|
* http://www.wolframalpha.com/input/?i=%28sin%28+x%2F64*pi%29**8+*+255%2C+x%3D0+to+63
|
|
* (0..63).each {|x| p ((sin(x/64.0*PI)**8)*255).to_i }
|
|
*/
|
|
static const uint8_t breathing_table[64] PROGMEM = {
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 6, 10,
|
|
15, 23, 32, 44, 58, 74, 93, 113, 135, 157, 179, 199, 218, 233, 245, 252,
|
|
255, 252, 245, 233, 218, 199, 179, 157, 135, 113, 93, 74, 58, 44, 32, 23,
|
|
15, 10, 6, 4, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
|
|
ISR(TIMER1_COMPA_vect)
|
|
{
|
|
/* Software PWM
|
|
* timer:1111 1111 1111 1111
|
|
* \_____/\/ \_______/____ count(0-255)
|
|
* \ \______________ duration of step(4)
|
|
* \__________________ index of step table(0-63)
|
|
*/
|
|
static union {
|
|
uint16_t row;
|
|
struct {
|
|
uint8_t count:8;
|
|
uint8_t duration:2;
|
|
uint8_t index:6;
|
|
} pwm;
|
|
} timer = { .row = 0 };
|
|
|
|
timer.row++;
|
|
|
|
// LED on
|
|
if (timer.pwm.count == 0) {
|
|
led_set(1<<USB_LED_CAPS_LOCK);
|
|
}
|
|
// LED off
|
|
if (timer.pwm.count == pgm_read_byte(&breathing_table[timer.pwm.index])) {
|
|
led_set(0);
|
|
}
|
|
}
|