1
0
This repo is archived. You can view files and clone it, but cannot push or open issues or pull requests.
tmk_keyboard_custom/common/breathing_led.c
2014-04-15 16:28:48 +09:00

107 lines
2.9 KiB
C

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include "led.h"
#include "breathing_led.h"
#include "backlight.h"
#include "debug.h"
#define BREATHING_LED_TIMER_TOP F_CPU/64
breathing_led_config_t breathing_led_config;
void breathing_led_init(void)
{
/* Timer3 setup */
/* CTC mode */
TCCR3B |= _BV(WGM12);
/* Clock selelct: clk/1 */
TCCR3B |= _BV(CS10);
/* Set TOP value */
uint8_t sreg = SREG;
cli();
OCR3AH = (BREATHING_LED_TIMER_TOP>>8)&0xff;
OCR3AL = BREATHING_LED_TIMER_TOP&0xff;
SREG = sreg;
}
bool breathing_led_is_enabled(void)
{
return breathing_led_config.enable;
}
void breathing_led_enable(void)
{
/* Enable Compare Match Interrupt */
TIMSK3 |= _BV(OCIE3A);
breathing_led_config.enable = true;
dprintf("breathing led on: %u\n", breathing_led_config.enable);
eeconfig_write_breathing_led(breathing_led_config.raw);
}
void breathing_led_disable(void)
{
/* Disable Compare Match Interrupt */
TIMSK3 &= ~_BV(OCIE3A);
breathing_led_config.enable = false;
dprintf("breathing led off: %u\n", breathing_led_config.enable);
eeconfig_write_breathing_led(breathing_led_config.raw);
}
void breathing_led_toggle(void)
{
/* Disable Compare Match Interrupt */
TIMSK3 ^= _BV(OCIE3A);
breathing_led_config.enable ^= 1;
dprintf("breathing led toggle: %u\n", breathing_led_config.enable);
eeconfig_write_breathing_led(breathing_led_config.raw);
}
void breathing_led_increase(void)
{
if (breathing_led_config.enable) {
if (breathing_led_config.level < BREATHING_LED_LEVELS) {
breathing_led_config.level++;
eeconfig_write_breathing_led(breathing_led_config.raw);
}
dprintf("breathing led speed increase: %u\n", breathing_led_config.level);
}
}
void breathing_led_decrease(void)
{
if (breathing_led_config.enable) {
if (breathing_led_config.level > 0)
{
breathing_led_config.level--;
eeconfig_write_breathing_led(breathing_led_config.raw);
}
dprintf("breathing led speed decrease: %u\n", breathing_led_config.level);
}
}
/* Breathing 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(TIMER3_COMPA_vect)
{
uint8_t index = 0;
uint8_t step = 0;
step++;
if (step >= BREATHING_LED_LEVELS - breathing_led_config.level) {
step = 0;
index++;
backlight_set_raw(pgm_read_byte(&breathing_table[index]));
}
}