140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/**
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* Breathing effect code for PS2AVRGB boards (ATMEGA32A)
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* Works in conjunction with `backlight.c`.
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*
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* Code adapted from `quantum.c` to register with the existing TIMER1 overflow
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* handler in `backlight.c` instead of setting up its own timer.
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* Kenneth A. (github.com/krusli | krusli.me)
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*/
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#ifdef BACKLIGHT_ENABLE
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#ifdef BACKLIGHT_BREATHING
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#include "backlight_custom.h"
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#ifndef BREATHING_PERIOD
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#define BREATHING_PERIOD 6
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#endif
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#define breathing_min() do {breathing_counter = 0;} while (0)
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#define breathing_max() do {breathing_counter = breathing_period * 244 / 2;} while (0)
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// TODO make this share code with quantum.c
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#define BREATHING_NO_HALT 0
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#define BREATHING_HALT_OFF 1
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#define BREATHING_HALT_ON 2
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#define BREATHING_STEPS 128
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static uint8_t breathing_period = BREATHING_PERIOD;
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static uint8_t breathing_halt = BREATHING_NO_HALT;
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static uint16_t breathing_counter = 0;
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static bool breathing = false;
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bool is_breathing(void) {
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return breathing;
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}
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// See http://jared.geek.nz/2013/feb/linear-led-pwm
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static uint16_t cie_lightness(uint16_t v) {
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if (v <= 5243) // if below 8% of max
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return v / 9; // same as dividing by 900%
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else {
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uint32_t y = (((uint32_t) v + 10486) << 8) / (10486 + 0xFFFFUL); // add 16% of max and compare
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// to get a useful result with integer division, we shift left in the expression above
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// and revert what we've done again after squaring.
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y = y * y * y >> 8;
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if (y > 0xFFFFUL) // prevent overflow
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return 0xFFFFU;
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else
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return (uint16_t) y;
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}
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}
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void breathing_enable(void) {
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breathing = true;
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breathing_counter = 0;
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breathing_halt = BREATHING_NO_HALT;
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// interrupt already registered
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}
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void breathing_pulse(void) {
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if (get_backlight_level() == 0)
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breathing_min();
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else
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breathing_max();
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breathing_halt = BREATHING_HALT_ON;
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// breathing_interrupt_enable();
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breathing = true;
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}
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void breathing_disable(void) {
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breathing = false;
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// backlight_set(get_backlight_level());
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b_led_set(get_backlight_level()); // custom implementation of backlight_set()
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}
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void breathing_self_disable(void)
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{
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if (get_backlight_level() == 0)
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breathing_halt = BREATHING_HALT_OFF;
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else
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breathing_halt = BREATHING_HALT_ON;
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}
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void breathing_toggle(void) {
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if (is_breathing())
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breathing_disable();
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else
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breathing_enable();
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}
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void breathing_period_set(uint8_t value)
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{
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if (!value)
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value = 1;
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breathing_period = value;
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}
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void breathing_period_default(void) {
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breathing_period_set(BREATHING_PERIOD);
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}
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void breathing_period_inc(void)
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{
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breathing_period_set(breathing_period+1);
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}
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void breathing_period_dec(void)
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{
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breathing_period_set(breathing_period-1);
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}
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/* To generate breathing curve in python:
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* from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)]
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*/
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static const uint8_t breathing_table[BREATHING_STEPS] PROGMEM = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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// Use this before the cie_lightness function.
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static inline uint16_t scale_backlight(uint16_t v) {
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return v / BACKLIGHT_LEVELS * get_backlight_level();
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}
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void custom_breathing_handler(void) {
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uint16_t interval = (uint16_t) breathing_period * 244 / BREATHING_STEPS;
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// resetting after one period to prevent ugly reset at overflow.
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breathing_counter = (breathing_counter + 1) % (breathing_period * 244);
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uint8_t index = breathing_counter / interval % BREATHING_STEPS;
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if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) ||
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((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1)))
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{
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// breathing_interrupt_disable();
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}
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setPWM(cie_lightness(scale_backlight((uint16_t) pgm_read_byte(&breathing_table[index]) * 0x0101U)));
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}
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#endif // BACKLIGHT_BREATHING
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#endif // BACKLIGHT_ENABLE
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