104 lines
3.9 KiB
C
104 lines
3.9 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/256
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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(WGM32);
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/* Clock selelct: clk/8 */
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TCCR3B |= _BV(CS30);
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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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*
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* http://www.wolframalpha.com/input/?i=Table%5Bfloor%28%28exp%28sin%28x%2F256*2*pi%2B3%2F2*pi%29%29-1%2Fe%29*%28256%2F%28e-1%2Fe%29%29%29%2C+%7Bx%2C0%2C255%2C1%7D%5D
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* Table[floor((exp(sin(x/256*2*pi+3/2*pi))-1/e)*(256/(e-1/e))), {x,0,255,1}]
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* (0..255).each {|x| print ((exp(sin(x/256.0*2*PI+3.0/2*PI))-1/E)*(256/(E-1/E))).to_i, ', ' }
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*/
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static const uint8_t breathing_table[256] PROGMEM = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8, 8, 9, 10, 11, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 25, 26, 27, 29, 30, 32, 34, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 56, 58, 61, 63, 66, 68, 71, 74, 77, 80, 83, 86, 89, 92, 95, 98, 102, 105, 108, 112, 116, 119, 123, 126, 130, 134, 138, 142, 145, 149, 153, 157, 161, 165, 169, 173, 176, 180, 184, 188, 192, 195, 199, 203, 206, 210, 213, 216, 219, 223, 226, 228, 231, 234, 236, 239, 241, 243, 245, 247, 248, 250, 251, 252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 254, 253, 252, 251, 250, 248, 247, 245, 243, 241, 239, 236, 234, 231, 228, 226, 223, 219, 216, 213, 210, 206, 203, 199, 195, 192, 188, 184, 180, 176, 173, 169, 165, 161, 157, 153, 149, 145, 142, 138, 134, 130, 126, 123, 119, 116, 112, 108, 105, 102, 98, 95, 92, 89, 86, 83, 80, 77, 74, 71, 68, 66, 63, 61, 58, 56, 53, 51, 49, 47, 45, 43, 41, 39, 37, 35, 34, 32, 30, 29, 27, 26, 25, 23, 22, 21, 19, 18, 17, 16, 15, 14, 13, 12, 11, 11, 10, 9, 8, 8, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 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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static uint8_t index = 0;
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static 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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