mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-11-30 04:37:14 +06:00
90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
/*
|
|
The MIT License (MIT)
|
|
|
|
Copyright (c) 2016 Fred Sundvik
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
*/
|
|
|
|
#include "lcd_backlight.h"
|
|
#include <math.h>
|
|
|
|
static uint8_t current_hue = 0;
|
|
static uint8_t current_saturation = 0;
|
|
static uint8_t current_intensity = 0;
|
|
static uint8_t current_brightness = 0;
|
|
|
|
void lcd_backlight_init(void) {
|
|
lcd_backlight_hal_init();
|
|
lcd_backlight_color(current_hue, current_saturation, current_intensity);
|
|
}
|
|
|
|
// This code is based on Brian Neltner's blogpost and example code
|
|
// "Why every LED light should be using HSI colorspace".
|
|
// http://blog.saikoled.com/post/43693602826/why-every-led-light-should-be-using-hsi
|
|
static void hsi_to_rgb(float h, float s, float i, uint16_t* r_out, uint16_t* g_out, uint16_t* b_out) {
|
|
unsigned int r, g, b;
|
|
h = fmodf(h, 360.0f); // cycle h around to 0-360 degrees
|
|
h = 3.14159f * h / 180.0f; // Convert to radians.
|
|
s = s > 0.0f ? (s < 1.0f ? s : 1.0f) : 0.0f; // clamp s and i to interval [0,1]
|
|
i = i > 0.0f ? (i < 1.0f ? i : 1.0f) : 0.0f;
|
|
|
|
// Math! Thanks in part to Kyle Miller.
|
|
if(h < 2.09439f) {
|
|
r = 65535.0f * i/3.0f *(1.0f + s * cos(h) / cosf(1.047196667f - h));
|
|
g = 65535.0f * i/3.0f *(1.0f + s *(1.0f - cosf(h) / cos(1.047196667f - h)));
|
|
b = 65535.0f * i/3.0f *(1.0f - s);
|
|
} else if(h < 4.188787) {
|
|
h = h - 2.09439;
|
|
g = 65535.0f * i/3.0f *(1.0f + s * cosf(h) / cosf(1.047196667f - h));
|
|
b = 65535.0f * i/3.0f *(1.0f + s * (1.0f - cosf(h) / cosf(1.047196667f - h)));
|
|
r = 65535.0f * i/3.0f *(1.0f - s);
|
|
} else {
|
|
h = h - 4.188787;
|
|
b = 65535.0f*i/3.0f * (1.0f + s * cosf(h) / cosf(1.047196667f - h));
|
|
r = 65535.0f*i/3.0f * (1.0f + s * (1.0f - cosf(h) / cosf(1.047196667f - h)));
|
|
g = 65535.0f*i/3.0f * (1.0f - s);
|
|
}
|
|
*r_out = r > 65535 ? 65535 : r;
|
|
*g_out = g > 65535 ? 65535 : g;
|
|
*b_out = b > 65535 ? 65535 : b;
|
|
}
|
|
|
|
void lcd_backlight_color(uint8_t hue, uint8_t saturation, uint8_t intensity) {
|
|
uint16_t r, g, b;
|
|
float hue_f = 360.0f * (float)hue / 255.0f;
|
|
float saturation_f = (float)saturation / 255.0f;
|
|
float intensity_f = (float)intensity / 255.0f;
|
|
intensity_f *= (float)current_brightness / 255.0f;
|
|
hsi_to_rgb(hue_f, saturation_f, intensity_f, &r, &g, &b);
|
|
current_hue = hue;
|
|
current_saturation = saturation;
|
|
current_intensity = intensity;
|
|
lcd_backlight_hal_color(r, g, b);
|
|
}
|
|
|
|
void lcd_backlight_brightness(uint8_t b) {
|
|
current_brightness = b;
|
|
lcd_backlight_color(current_hue, current_saturation, current_intensity);
|
|
}
|
|
|
|
uint8_t lcd_get_backlight_brightness(void) {
|
|
return current_brightness;
|
|
}
|