优化亮度平滑过渡

2026-07-27 12:01:22 +08:00
parent faa3a1bdc1
commit 38fc1d2ea3
3 changed files with 48 additions and 13 deletions
@@ -124,11 +124,13 @@ static void Pairing_Feedback_Apply(uint8_t on)
    if(on)
    {
        Start_PWM();
+        Light_Transition_SyncBrightness(BRIGHTNESS_MAX_PERCENT);
        W_PWM_duty = 100U;
        C_PWM_duty = 0U;
    }
    else
    {
+        Light_Transition_SyncBrightness(0U);
        W_PWM_duty = 0U;
        C_PWM_duty = 0U;
        Stop_PWM();
@@ -143,6 +145,9 @@ static void Pairing_Feedback_Restore(void)
    C_PWM = pairing_saved_c;
    Brightness = pairing_saved_brightness;
    Mode = pairing_saved_mode;
+    Light_Transition_SyncBrightness(
+        pairing_saved_status == POWERON ? pairing_saved_brightness : 0U);
+
    W_PWM_duty = pairing_saved_w_duty;
    C_PWM_duty = pairing_saved_c_duty;

@@ -5,6 +5,7 @@
 volatile uint8_t Light_Transition_FadeActive;

 #define LIGHT_FADE_STEP 1U
+#define BRIGHTNESS_SMOOTH_SHIFT 4U

 /*
 * Gamma 1.8, mapping APP levels 1..100 to a stable physical range of
@@ -24,6 +25,36 @@ static const uint16_t brightness_gamma_q12[100] = {
    3515U, 3577U, 3640U, 3704U, 3768U, 3832U, 3897U, 3963U, 4029U, 4096U
 };

+static uint16_t current_brightness_q12;
+
+static uint16_t brightness_scale_for_level(uint8_t level)
+{
+    if(level == 0U) return 0U;
+    if(level < BRIGHTNESS_MIN_PERCENT) level = BRIGHTNESS_MIN_PERCENT;
+    if(level > BRIGHTNESS_MAX_PERCENT) level = BRIGHTNESS_MAX_PERCENT;
+    return brightness_gamma_q12[level - 1U];
+}
+
+static uint16_t approach_brightness_scale(uint16_t current, uint16_t target)
+{
+    uint16_t delta;
+    uint16_t step;
+
+    if(current == target) return current;
+    if(current < target)
+    {
+        delta = target - current;
+        step = (uint16_t)((delta + ((1U << BRIGHTNESS_SMOOTH_SHIFT) - 1U)) >>
+                          BRIGHTNESS_SMOOTH_SHIFT);
+        return current + step;
+    }
+
+    delta = current - target;
+    step = (uint16_t)((delta + ((1U << BRIGHTNESS_SMOOTH_SHIFT) - 1U)) >>
+                      BRIGHTNESS_SMOOTH_SHIFT);
+    return current - step;
+}
+
 static uint16_t approach_target(uint16_t current, uint16_t target)
 {
    if(current < target)
@@ -39,27 +70,25 @@ static uint16_t approach_target(uint16_t current, uint16_t target)
    return current;
 }

+void Light_Transition_SyncBrightness(uint8_t level)
+{
+    current_brightness_q12 = brightness_scale_for_level(level);
+}
+
 void Light_Transition_Task(void)
 {
    uint8_t target_brightness = 0U;
    uint16_t target_w;
    uint16_t target_c;
+    uint16_t target_brightness_scale;
    uint16_t brightness_scale;

    if(deviceStatus != POWEROFF) target_brightness = Brightness;
-    if(target_brightness > BRIGHTNESS_MAX_PERCENT)
-        target_brightness = BRIGHTNESS_MAX_PERCENT;
-
-    if(target_brightness == 0U)
-    {
-        brightness_scale = 0U;
-    }
-    else
-    {
-        if(target_brightness < BRIGHTNESS_MIN_PERCENT)
-            target_brightness = BRIGHTNESS_MIN_PERCENT;
-        brightness_scale = brightness_gamma_q12[target_brightness - 1U];
-    }
+    target_brightness_scale = brightness_scale_for_level(target_brightness);
+    current_brightness_q12 =
+        approach_brightness_scale(current_brightness_q12,
+                                  target_brightness_scale);
+    brightness_scale = current_brightness_q12;

    target_w =
        (uint16_t)(((uint32_t)W_PWM * brightness_scale + 2048U) >> 12);
@@ -9,5 +9,6 @@ extern volatile uint8_t Light_Transition_FadeActive;
 #define Light_Transition_RequestOff() (Light_Transition_FadeActive = 1U)

 void Light_Transition_Task(void);
+void Light_Transition_SyncBrightness(uint8_t level);

 #endif