diff --git a/app/src/main/cpp/MpPreview.cpp b/app/src/main/cpp/MpPreview.cpp
index c1165f4..0cbecb3 100644
--- a/app/src/main/cpp/MpPreview.cpp
+++ b/app/src/main/cpp/MpPreview.cpp
@@ -18,6 +18,39 @@
 
 #include "hdr.h"
 
+
+
+#define IOT_PARAM_WRITE 0xAE
+#define IOT_PARAM_READ 0xAF
+#define MAX_STRING_LEN 32
+
+typedef struct
+{
+    int cmd;
+    int value;
+    int result;
+    long value2;
+    char str[MAX_STRING_LEN];
+}IOT_PARAM;
+
+int setGpioInt(int cmd, int val)
+{
+    int fd = open("/dev/mtkgpioctrl", O_RDONLY);
+    // LOGE("set_int fd=%d,cmd=%d,value=%d\r\n",fd, cmd, value);
+    if( fd > 0 )
+    {
+        IOT_PARAM param;
+        param.cmd = cmd;
+        param.value = val;
+        int res = ioctl(fd, IOT_PARAM_WRITE, &param);
+        // LOGE("set_int22 cmd=%d,value=%d,result=%d\r\n",param.cmd, param.value, param.result);
+        close(fd);
+        return 0;
+    }
+    return -1;
+}
+
+
 namespace cv2
 {
     using namespace cv;
@@ -497,4 +530,11 @@ JNIEXPORT jboolean JNICALL
 Java_com_xypower_mppreview_Camera2RawFragment_decodeDng(JNIEnv *env, jclass clazz,
                                                         jobject byte_buffer, jstring output_path) {
     // TODO: implement decodeDng()
+}
+extern "C"
+JNIEXPORT void JNICALL
+Java_com_xypower_mppreview_ui_CameraChannelActivity_setInt(JNIEnv *env, jclass clazz, jint cmd,
+                                                           jint val) {
+    // TODO: implement setInt()
+    setGpioInt(cmd, val);
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/xypower/mppreview/ui/CameraChannelActivity.java b/app/src/main/java/com/xypower/mppreview/ui/CameraChannelActivity.java
index d630259..5176c0a 100644
--- a/app/src/main/java/com/xypower/mppreview/ui/CameraChannelActivity.java
+++ b/app/src/main/java/com/xypower/mppreview/ui/CameraChannelActivity.java
@@ -1,5 +1,7 @@
 package com.xypower.mppreview.ui;
 
+import static java.lang.System.loadLibrary;
+
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.camera.core.CameraInfo;
@@ -33,12 +35,18 @@ import java.util.concurrent.Executors;
 
 public class CameraChannelActivity extends AppCompatActivity implements View.OnClickListener {
 
+    static {
+        loadLibrary("mppreview");
+    }
+
     private com.xypower.mppreview.databinding.ActivityCameraChannelBinding viewBinding;
     private int camerid;
     private ImageCapture imageCapture;
     private ExecutorService cameraExecutor;
     private File outputDirectory;
 
+    private static native void setInt(int cmd, int val);
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);