fix: ESP-HI audio sampling problem (#1207)

main/boards/esp-hi/adc_pdm_audio_codec.h

@@ -5,6 +5,7 @@
 
 #include <esp_codec_dev.h>
 #include <esp_codec_dev_defaults.h>
+#include <esp_timer.h>
 
 class AdcPdmAudioCodec : public AudioCodec {
 private:
@@ -12,6 +13,13 @@ private:
     esp_codec_dev_handle_t input_dev_ = nullptr;
     gpio_num_t pa_ctrl_pin_ = GPIO_NUM_NC;
 
+    // 定时器相关成员变量
+    esp_timer_handle_t output_timer_ = nullptr;
+    static constexpr uint64_t TIMER_TIMEOUT_US = 120000; // 120ms = 120000us
+
+    // 定时器回调函数
+    static void OutputTimerCallback(void* arg);
+
     virtual int Read(int16_t* dest, int samples) override;
     virtual int Write(const int16_t* data, int samples) override;