107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "led.h"
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#include "breathing_led.h"
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#include "backlight.h"
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#include "debug.h"
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#define BREATHING_LED_TIMER_TOP F_CPU/64
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breathing_led_config_t breathing_led_config;
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void breathing_led_init(void)
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{
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/* Timer3 setup */
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/* CTC mode */
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TCCR3B |= _BV(WGM12);
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/* Clock selelct: clk/1 */
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TCCR3B |= _BV(CS10);
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/* Set TOP value */
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uint8_t sreg = SREG;
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cli();
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OCR3AH = (BREATHING_LED_TIMER_TOP>>8)&0xff;
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OCR3AL = BREATHING_LED_TIMER_TOP&0xff;
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SREG = sreg;
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}
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bool breathing_led_is_enabled(void)
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{
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return breathing_led_config.enable;
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}
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void breathing_led_enable(void)
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{
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/* Enable Compare Match Interrupt */
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TIMSK3 |= _BV(OCIE3A);
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breathing_led_config.enable = true;
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dprintf("breathing led on: %u\n", breathing_led_config.enable);
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eeconfig_write_breathing_led(breathing_led_config.raw);
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}
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void breathing_led_disable(void)
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{
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/* Disable Compare Match Interrupt */
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TIMSK3 &= ~_BV(OCIE3A);
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breathing_led_config.enable = false;
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dprintf("breathing led off: %u\n", breathing_led_config.enable);
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eeconfig_write_breathing_led(breathing_led_config.raw);
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}
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void breathing_led_toggle(void)
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{
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/* Disable Compare Match Interrupt */
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TIMSK3 ^= _BV(OCIE3A);
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breathing_led_config.enable ^= 1;
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dprintf("breathing led toggle: %u\n", breathing_led_config.enable);
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eeconfig_write_breathing_led(breathing_led_config.raw);
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}
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void breathing_led_increase(void)
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{
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if (breathing_led_config.enable) {
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if (breathing_led_config.level < BREATHING_LED_LEVELS) {
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breathing_led_config.level++;
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eeconfig_write_breathing_led(breathing_led_config.raw);
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}
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dprintf("breathing led speed increase: %u\n", breathing_led_config.level);
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}
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}
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void breathing_led_decrease(void)
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{
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if (breathing_led_config.enable) {
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if (breathing_led_config.level > 0)
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{
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breathing_led_config.level--;
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eeconfig_write_breathing_led(breathing_led_config.raw);
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}
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dprintf("breathing led speed decrease: %u\n", breathing_led_config.level);
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}
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}
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/* Breathing LED brighness(PWM On period) table
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* (64[steps] * 4[duration]) / 64[PWM periods/s] = 4 second breath cycle
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*
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* http://www.wolframalpha.com/input/?i=%28sin%28+x%2F64*pi%29**8+*+255%2C+x%3D0+to+63
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* (0..63).each {|x| p ((sin(x/64.0*PI)**8)*255).to_i }
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*/
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static const uint8_t breathing_table[64] PROGMEM = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 6, 10,
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15, 23, 32, 44, 58, 74, 93, 113, 135, 157, 179, 199, 218, 233, 245, 252,
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255, 252, 245, 233, 218, 199, 179, 157, 135, 113, 93, 74, 58, 44, 32, 23,
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15, 10, 6, 4, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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ISR(TIMER3_COMPA_vect)
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{
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uint8_t index = 0;
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uint8_t step = 0;
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step++;
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if (step >= BREATHING_LED_LEVELS - breathing_led_config.level) {
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step = 0;
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index++;
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backlight_set_raw(pgm_read_byte(&breathing_table[index]));
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}
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}
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