forked from forks/qmk_firmware
CIE 1931 for the LCD backlight
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f113f95440
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@ -70,10 +70,33 @@ void lcd_backlight_hal_init(void) {
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RGB_PORT->PCR[BLUE_PIN] = RGB_MODE;
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}
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static uint16_t cie_lightness(uint16_t v) {
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// The CIE 1931 formula for lightness
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// Y = luminance (output) 0-1
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// L = lightness input 0 - 100
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// Y = (L* / 902.3) if L* <= 8
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// Y = ((L* + 16) / 116)^3 if L* > 8
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float l = 100.0f * (v / 65535.0f);
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float y = 0.0f;
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if (l <= 8.0f) {
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y = l / 902.3;
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}
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else {
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y = ((l + 16.0f) / 116.0f);
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y = y * y * y;
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if (y > 1.0f) {
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y = 1.0f;
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}
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}
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return y * 65535.0f;
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}
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void lcd_backlight_hal_color(uint16_t r, uint16_t g, uint16_t b) {
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CHANNEL_RED.CnV = r;
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CHANNEL_GREEN.CnV = g;
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CHANNEL_BLUE.CnV = b;
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CHANNEL_RED.CnV = cie_lightness(r);
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CHANNEL_GREEN.CnV = cie_lightness(g);
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CHANNEL_BLUE.CnV = cie_lightness(b);
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}
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__attribute__ ((weak))
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@ -70,8 +70,8 @@ static const uint8_t image_data_lcd_logo[512] = {
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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static const uint32_t logo_background_color = LCD_COLOR(0x00, 0x00, 0x80);
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static const uint32_t initial_color = LCD_COLOR(0, 0, 0xFF);
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static const uint32_t logo_background_color = LCD_COLOR(0x00, 0x00, 0xFF);
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static const uint32_t initial_color = LCD_COLOR(0, 0, 0);
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bool display_logo(keyframe_animation_t* animation, visualizer_state_t* state) {
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(void)state;
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@ -155,7 +155,7 @@ static keyframe_animation_t resume_animation = {
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void initialize_user_visualizer(visualizer_state_t* state) {
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// The brightness will be dynamically adjustable in the future
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// But for now, change it here.
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lcd_backlight_brightness(0x50);
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lcd_backlight_brightness(130);
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state->current_lcd_color = initial_color;
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state->target_lcd_color = logo_background_color;
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start_keyframe_animation(&startup_animation);
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