fix: add frame buffering to NoAudioProcessor for ESP32-C5 (#1766)

* add: Moji 2 has built-in ESP32-C5 dual band Wi-Fi

* feat: PowerSaveTimer 160 >> 240

* fix(audio): add frame buffering to NoAudioProcessor

On chips where CONFIG_USE_AUDIO_PROCESSOR is unavailable (e.g., ESP32-C5,
which is excluded by Kconfig despite having PSRAM), NoAudioProcessor is used.
The original implementation passed through 160-sample chunks directly, but
the Opus encoder expects 960 samples (60ms @ 16kHz), resulting in frame size
mismatch errors, high CPU usage, and watchdog resets.

Added output_buffer_ to accumulate audio samples until reaching
frame_samples_ (960) before outputting, matching AfeAudioProcessor behavior.

other:
Turn off sleep mode (PowerSaveTimer)

main/audio/processors/no_audio_processor.cc

@@ -6,6 +6,7 @@
 void NoAudioProcessor::Initialize(AudioCodec* codec, int frame_duration_ms, srmodel_list_t* models_list) {
     codec_ = codec;
     frame_samples_ = frame_duration_ms * 16000 / 1000;
+    output_buffer_.reserve(frame_samples_);
 }
 
 void NoAudioProcessor::Feed(std::vector<int16_t>&& data) {
@@ -13,15 +14,25 @@ void NoAudioProcessor::Feed(std::vector<int16_t>&& data) {
         return;
     }
 
+    // Convert stereo to mono if needed
     if (codec_->input_channels() == 2) {
-        // If input channels is 2, we need to fetch the left channel data
-        auto mono_data = std::vector<int16_t>(data.size() / 2);
-        for (size_t i = 0, j = 0; i < mono_data.size(); ++i, j += 2) {
-            mono_data[i] = data[j];
+        for (size_t i = 0, j = 0; i < data.size() / 2; ++i, j += 2) {
+            output_buffer_.push_back(data[j]);
         }
-        output_callback_(std::move(mono_data));
     } else {
-        output_callback_(std::move(data));
+        output_buffer_.insert(output_buffer_.end(), data.begin(), data.end());
+    }
+
+    // Output complete frames when buffer has enough data
+    while (output_buffer_.size() >= (size_t)frame_samples_) {
+        if (output_buffer_.size() == (size_t)frame_samples_) {
+            output_callback_(std::move(output_buffer_));
+            output_buffer_.clear();
+            output_buffer_.reserve(frame_samples_);
+        } else {
+            output_callback_(std::vector<int16_t>(output_buffer_.begin(), output_buffer_.begin() + frame_samples_));
+            output_buffer_.erase(output_buffer_.begin(), output_buffer_.begin() + frame_samples_);
+        }
     }
 }
 
@@ -31,6 +42,7 @@ void NoAudioProcessor::Start() {
 
 void NoAudioProcessor::Stop() {
     is_running_ = false;
+    output_buffer_.clear();
 }
 
 bool NoAudioProcessor::IsRunning() {

main/audio/processors/no_audio_processor.h

@@ -26,6 +26,7 @@ public:
 private:
     AudioCodec* codec_ = nullptr;
     int frame_samples_ = 0;
+    std::vector<int16_t> output_buffer_;
     std::function<void(std::vector<int16_t>&& data)> output_callback_;
     std::function<void(bool speaking)> vad_state_change_callback_;
     std::atomic<bool> is_running_ = false;

main/boards/movecall-moji2-esp32c5/config.json

@@ -6,7 +6,6 @@
             "sdkconfig_append": [
                 "CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y",
                 "CONFIG_PARTITION_TABLE_CUSTOM_FILENAME=\"partitions/v2/16m.csv\"",
-                "CONFIG_PM_ENABLE=y",
                 "CONFIG_FREERTOS_USE_TICKLESS_IDLE=y",
                 "CONFIG_SPIRAM_MODE_QUAD=y",
                 "CONFIG_SPIRAM_SPEED_80M=y",

main/boards/movecall-moji2-esp32c5/movecall_moji2_esp32s3.cc

@@ -227,16 +227,19 @@ private:
     void InitializeBatteryMonitor() {
         adc_battery_monitor_ = new AdcBatteryMonitor(ADC_UNIT_1, ADC_CHANNEL_3, 5100000, 5100000, GPIO_NUM_NC);
         adc_battery_monitor_->OnChargingStatusChanged([this](bool is_charging) {
-            if (is_charging) {
-                power_save_timer_->SetEnabled(false);
-            } else {
-                power_save_timer_->SetEnabled(true);
+            if (power_save_timer_ != nullptr){
+                if (is_charging) {
+                    power_save_timer_->SetEnabled(false);
+                } else {
+                    power_save_timer_->SetEnabled(true);
+                }
             }
+
         });
     }
 
     void InitializePowerSaveTimer() {
-        power_save_timer_ = new PowerSaveTimer(240, 300);
+        power_save_timer_ = new PowerSaveTimer(240, -1, -1);
         power_save_timer_->OnEnterSleepMode([this]() {
             GetDisplay()->SetPowerSaveMode(true);
         });
@@ -348,8 +351,8 @@ private:
 public:
     MovecallMoji2ESP32C5() : boot_button_(BOOT_BUTTON_GPIO) {  
         InitializeCodecI2c();
-        InitializeBatteryMonitor();
         InitializePowerSaveTimer();
+        InitializeBatteryMonitor();
         InitializeSpi();
         InitializeSt77916Display();
         InitializeButtons();

main/display/lvgl_display/lvgl_display.cc

@@ -174,11 +174,15 @@ void LvglDisplay::UpdateStatusBar(bool update_all) {
             lv_label_set_text(battery_label_, battery_icon_);
         }
 
-        if (low_battery_popup_ != nullptr) {
+        // Check low battery popup only when clock tick event is triggered
+        // Because when initializing, the battery level is not ready yet.
+        if (low_battery_popup_ != nullptr && !update_all) {
             if (strcmp(icon, FONT_AWESOME_BATTERY_EMPTY) == 0 && discharging) {
                 if (lv_obj_has_flag(low_battery_popup_, LV_OBJ_FLAG_HIDDEN)) { // Show if low battery popup is hidden
                     lv_obj_remove_flag(low_battery_popup_, LV_OBJ_FLAG_HIDDEN);
-                    app.PlaySound(Lang::Sounds::OGG_LOW_BATTERY);
+                    app.Schedule([&app]() {
+                        app.PlaySound(Lang::Sounds::OGG_LOW_BATTERY);
+                    });
                 }
             } else {
                 // Hide the low battery popup when the battery is not empty