diff --git a/app/src/main/java/com/xypower/mpapp/MainActivity.java b/app/src/main/java/com/xypower/mpapp/MainActivity.java
index f94e7bb6..5a926f9d 100644
--- a/app/src/main/java/com/xypower/mpapp/MainActivity.java
+++ b/app/src/main/java/com/xypower/mpapp/MainActivity.java
@@ -34,6 +34,7 @@ import android.widget.Toast;
 
 import com.dev.devapi.api.SysApi;
 import com.dowse.camera.client.DSCameraManager;
+import com.xypower.common.CameraUtils;
 import com.xypower.common.MicroPhotoContext;
 import com.xypower.mpapp.databinding.ActivityMainBinding;
 import com.xypower.mpapp.utils.RandomReader;
@@ -55,6 +56,9 @@ public class MainActivity extends AppCompatActivity {
         System.loadLibrary("microphoto");
     }
 
+    public static final int MAX_LOG_LINES = 64; // 320;
+
+    private int mLines = 0;
     private ActivityMainBinding binding;
 
     private Handler mHandler = null;
@@ -168,11 +172,27 @@ public class MainActivity extends AppCompatActivity {
                         } catch (Exception e) {
                         }
                         if (log != null) {
+
+                            long lines = log.chars().filter(ch -> ch == '\n').count();
+                            if (mLines + lines > MAX_LOG_LINES) {
+                                int excessLineNumber = mLines + (int)lines - MAX_LOG_LINES;
+
+                                int eolIndex = -1;
+                                CharSequence charSequence = binding.logs.getText();
+                                for(int i = 0; i < excessLineNumber; i++) {
+                                    do {
+                                        eolIndex++;
+                                    } while(eolIndex < charSequence.length() && charSequence.charAt(eolIndex) != '\n');
+                                }
+                                if (eolIndex < charSequence.length()) {
+                                    binding.logs.getEditableText().delete(0, eolIndex+1);
+                                }
+                            }
+
                             binding.logs.append(log);
 
-                            int line = binding.logs.getLineCount();
                             // if (line > 9) {//超出屏幕自动滚动显示(9是当前页面显示的最大行数)
-                            int offset = line * binding.logs.getLineHeight();
+                            int offset = binding.logs.getLineCount() * binding.logs.getLineHeight();
                             if (offset > binding.logs.getHeight()) {
                                 binding.logs.scrollTo(0, offset - binding.logs.getHeight() + binding.logs.getLineHeight());
                             }
@@ -445,9 +465,6 @@ public class MainActivity extends AppCompatActivity {
             }
         });
 
-
-
-
         binding.btnSendHb.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -488,6 +505,21 @@ public class MainActivity extends AppCompatActivity {
             }
         });
 
+        binding.btnCameraInfo.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                SysApi.setOtgState(true);
+                SysApi.setCam3V3Enable(true);
+
+                String cameraInfo = CameraUtils.getAllCameraInfo(view.getContext());
+
+                SysApi.setCam3V3Enable(false);
+                SysApi.setOtgState(false);
+
+                Toast.makeText(view.getContext(), cameraInfo, Toast.LENGTH_LONG).show();
+            }
+        });
+
     }
 
     public static void startMicroPhotoService(Context context, MicroPhotoContext.AppConfig curAppConfig, Messenger messenger) {
@@ -549,7 +581,6 @@ public class MainActivity extends AppCompatActivity {
         super.onDestroy();
     }
 
-
     private void setDefaultDataSubId(int subId) {
         SubscriptionManager subscriptionManager = (SubscriptionManager) getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE);
         try {
diff --git a/app/src/main/res/layout-land/activity_main.xml b/app/src/main/res/layout-land/activity_main.xml
index 512b531e..af25e1c1 100644
--- a/app/src/main/res/layout-land/activity_main.xml
+++ b/app/src/main/res/layout-land/activity_main.xml
@@ -304,6 +304,16 @@
         app:layout_constraintStart_toEndOf="@+id/btnRestartApp"
         app:layout_constraintTop_toTopOf="@+id/btnSendHb" />
 
+    <Button
+        android:id="@+id/btnCameraInfo"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/main_camera_info"
+        android:layout_marginStart="@dimen/activity_horizontal_margin"
+        android:minWidth="@dimen/activity_btn_min_width"
+        app:layout_constraintStart_toEndOf="@+id/btnReboot"
+        app:layout_constraintTop_toTopOf="@+id/btnSendHb" />
+
 
     <Button
         android:id="@+id/simchange"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 7159ad26..829a20d8 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -311,6 +311,16 @@
         app:layout_constraintStart_toEndOf="@+id/btnRestartApp"
         app:layout_constraintTop_toBottomOf="@+id/btnTakePhoto" />
 
+    <Button
+        android:id="@+id/btnCameraInfo"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/main_camera_info"
+        android:layout_marginStart="@dimen/activity_horizontal_margin"
+        android:minWidth="@dimen/activity_btn_min_width"
+        app:layout_constraintStart_toEndOf="@+id/btnReboot"
+        app:layout_constraintTop_toTopOf="@+id/btnSendHb" />
+
     <Button
         android:id="@+id/gps"
         android:layout_width="wrap_content"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 3bd8c244..16e645ea 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -9,6 +9,7 @@
     <string name="main_send_hb">心跳</string>
     <string name="main_restart_app">重启APP</string>
     <string name="main_reboot">重启设备</string>
+    <string name="main_camera_info">摄像头</string>
 
     <string name="confirm_reboot">重启设备</string>
     <string name="text_confirm_reboot">确认重启设备吗？</string>
diff --git a/common/src/main/java/com/xypower/common/CameraUtils.java b/common/src/main/java/com/xypower/common/CameraUtils.java
new file mode 100644
index 00000000..0cfe6eb2
--- /dev/null
+++ b/common/src/main/java/com/xypower/common/CameraUtils.java
@@ -0,0 +1,139 @@
+package com.xypower.common;
+
+import android.content.Context;
+import android.graphics.ImageFormat;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraManager;
+import android.hardware.camera2.CameraMetadata;
+import android.hardware.camera2.params.StreamConfigurationMap;
+import android.util.Log;
+import android.util.Size;
+
+public class CameraUtils {
+
+    public static String getAllCameraInfo(Context context) {
+        StringBuilder builder = new StringBuilder();
+        try {
+            CameraManager cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
+            String[] cameraIds = cameraManager.getCameraIdList();
+
+            builder.append("Count:");
+            builder.append(Integer.toString(cameraIds.length));
+            builder.append("\n");
+            int idx = 1;
+            for (String cameraId : cameraIds) {
+                CameraCharacteristics cameraCharacteristics = null;
+
+                try {
+                    cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
+                } catch (Exception ex) {
+                    ex.printStackTrace();
+                }
+
+                if (cameraCharacteristics != null) {
+
+                    builder.append(idx++);
+                    builder.append(": Id=");
+                    builder.append(cameraId);
+                    builder.append(" facing=");
+
+                    Integer facing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING);
+                    builder.append(facing == null ? "" : facing.toString());
+                    builder.append(" orientation=");
+                    Integer orientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
+                    builder.append(orientation == null ? "" : orientation.toString());
+
+                    StreamConfigurationMap map = cameraCharacteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
+                    Size[] sizes = map.getOutputSizes(ImageFormat.JPEG);
+
+                    for (int i = 0; i < sizes.length; i++) {
+                        Size itemSize = sizes[i];
+                        builder.append("(" + itemSize.getWidth() + "," + itemSize.getHeight() + ")");
+                        break;
+                    }
+
+                    builder.append("\n");
+                }
+            }
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+
+        return builder.toString();
+    }
+
+    public static String getDetailedCameraInfo(Context context, String cameraId) {
+        StringBuilder builder = new StringBuilder();
+        try {
+            CameraManager cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
+
+            CameraCharacteristics cameraCharacteristics = null;
+
+            try {
+                cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
+            } catch (Exception ex) {
+                ex.printStackTrace();
+            }
+
+            if (cameraCharacteristics != null) {
+
+                int[] capabilities = cameraCharacteristics.get(CameraCharacteristics.CONTROL_AF_AVAILABLE_MODES);
+                if (capabilities != null) {
+                    for (int c : capabilities) {
+                        builder.append("CONTROL_AF_AVAILABLE_MODES: (" + Integer.toString(c) + ")");
+                        if (c == CameraMetadata.CONTROL_AF_MODE_OFF) {
+                            builder.append(" CONTROL_AF_MODE_OFF");
+                        } else if (c == CameraMetadata.CONTROL_AF_MODE_AUTO) {
+                            builder.append(" CONTROL_AF_MODE_AUTO");
+                        } else if (c == CameraMetadata.CONTROL_AF_MODE_MACRO) {
+                            builder.append(" CONTROL_AF_MODE_MACRO");
+                        } else if (c == CameraMetadata.CONTROL_AF_MODE_CONTINUOUS_VIDEO) {
+                            builder.append(" CONTROL_AF_MODE_CONTINUOUS_VIDEO");
+                        } else if (c == CameraMetadata.CONTROL_AF_MODE_CONTINUOUS_PICTURE) {
+                            builder.append(" CONTROL_AF_MODE_CONTINUOUS_PICTURE");
+                        } else if (c == CameraMetadata.CONTROL_AF_MODE_EDOF) {
+                            builder.append(" CONTROL_AF_MODE_EDOF");
+                        }
+                        builder.append("\n");
+                    }
+                }
+
+                float[] apertures = cameraCharacteristics.get(CameraCharacteristics.LENS_INFO_AVAILABLE_APERTURES);
+                if (apertures != null) {
+                    if (apertures != null) {
+                        for (float f : apertures) {
+                            builder.append("LENS_INFO_AVAILABLE_APERTURES: " + Float.toString(f) + "\n");
+                        }
+                    }
+                }
+                Integer maxAf = cameraCharacteristics.get(CameraCharacteristics.CONTROL_MAX_REGIONS_AF);
+                builder.append("CONTROL_MAX_REGIONS_AF: " + Integer.toString(maxAf) + "\n");
+                float[] lengths = cameraCharacteristics.get(CameraCharacteristics.LENS_INFO_AVAILABLE_FOCAL_LENGTHS);
+                if (lengths != null) {
+                    for (float f : lengths) {
+                        builder.append("LENS_INFO_AVAILABLE_FOCAL_LENGTHS: " + Float.toString(f) + "\n");
+                    }
+                }
+
+                Float dis = cameraCharacteristics.get(CameraCharacteristics.LENS_INFO_MINIMUM_FOCUS_DISTANCE);
+                builder.append("LENS_INFO_MINIMUM_FOCUS_DISTANCE: " + ((dis == null) ? "null" : dis.toString()) + "\n");
+
+                StreamConfigurationMap map = cameraCharacteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
+                Size[] sizes = map.getOutputSizes(ImageFormat.YUV_420_888);
+
+                for (int i = 0; i < sizes.length; i++) { //遍历所有Size
+                    Size itemSize = sizes[i];
+                    // Log.e(TAG, "当前itemSize 宽=" + itemSize.getWidth() + "高=" + itemSize.getHeight());
+                    builder.append("Available Size: (" + itemSize.getWidth() + "," + itemSize.getHeight() + ")\n");
+                }
+
+                Log.i("CAM", builder.toString());
+            }
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+
+        return builder.toString();
+    }
+
+}