From 721b58f8c7ff302f2cf3f5ee6732177fffdbcfaa Mon Sep 17 00:00:00 2001
From: Forairaaaaa <applesyqd@outlook.com>
Date: Tue, 22 Jul 2025 17:55:33 +0800
Subject: [PATCH] Fix atoms3 backlight control (#959)

---
 main/boards/atoms3-echo-base/atoms3_echo_base.cc | 2 +-
 main/boards/common/backlight.cc                  | 4 ++--
 main/boards/common/backlight.h                   | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/main/boards/atoms3-echo-base/atoms3_echo_base.cc b/main/boards/atoms3-echo-base/atoms3_echo_base.cc
index 8709dc63..9d3ca679 100644
--- a/main/boards/atoms3-echo-base/atoms3_echo_base.cc
+++ b/main/boards/atoms3-echo-base/atoms3_echo_base.cc
@@ -229,7 +229,7 @@ public:
     }
 
     virtual Backlight* GetBacklight() override {
-        static PwmBacklight backlight(DISPLAY_BACKLIGHT_PIN, DISPLAY_BACKLIGHT_OUTPUT_INVERT);
+        static PwmBacklight backlight(DISPLAY_BACKLIGHT_PIN, DISPLAY_BACKLIGHT_OUTPUT_INVERT, 256);
         return &backlight;
     }
 };
diff --git a/main/boards/common/backlight.cc b/main/boards/common/backlight.cc
index 0d680efe..c62fd7ac 100644
--- a/main/boards/common/backlight.cc
+++ b/main/boards/common/backlight.cc
@@ -81,12 +81,12 @@ void Backlight::OnTransitionTimer() {
     }
 }
 
-PwmBacklight::PwmBacklight(gpio_num_t pin, bool output_invert) : Backlight() {
+PwmBacklight::PwmBacklight(gpio_num_t pin, bool output_invert, uint32_t freq_hz) : Backlight() {
     const ledc_timer_config_t backlight_timer = {
         .speed_mode = LEDC_LOW_SPEED_MODE,
         .duty_resolution = LEDC_TIMER_10_BIT,
         .timer_num = LEDC_TIMER_0,
-        .freq_hz = 25000, //背光pwm频率需要高一点，防止电感啸叫
+        .freq_hz = freq_hz, //背光pwm频率需要高一点，防止电感啸叫
         .clk_cfg = LEDC_AUTO_CLK,
         .deconfigure = false
     };
diff --git a/main/boards/common/backlight.h b/main/boards/common/backlight.h
index 4fd2ceca..5c09b3d2 100644
--- a/main/boards/common/backlight.h
+++ b/main/boards/common/backlight.h
@@ -29,7 +29,7 @@ protected:
 
 class PwmBacklight : public Backlight {
 public:
-    PwmBacklight(gpio_num_t pin, bool output_invert = false);
+    PwmBacklight(gpio_num_t pin, bool output_invert = false, uint32_t freq_hz = 25000);
     ~PwmBacklight();
 
     void SetBrightnessImpl(uint8_t brightness) override;