模拟器可以使用PC的串口

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1.模拟器可以使用PC的串口

启动模拟器并加载PC串口命令如下：

运行 emulator @模拟器名称 -qemu -serial COM1

2.查看串口是否被加载

启动后使用 adb shell 命令打开命令行

cd dev 查看会发现ttyS0 ttyS1 ttyS2,其他ttyS2 就是我们加载上来的串口COM1

3.修改权限

chmod 777 ttyS2

现在我们可以开发串口程序了。

4.串口程序实例

下载libserial_port.so ，放入libs/armeabi 目录，可以自己创建此目录

libserial_port.so 下载地址：

http://code.google.com/p/android-serialport-api/

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.util.Log;

public class SerialPort {

private static final String TAG = "SerialPort";

private FileDescriptor mFd;
private FileInputStream mFileInputStream;
private FileOutputStream mFileOutputStream;

public SerialPort(File device, int baudrate) throws SecurityException, IOException {

  if (!device.canRead() || !device.canWrite()) {
   try {
    Process su;
    su = Runtime.getRuntime().exec("/system/bin/su");
    String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
      + "exit\n";
    su.getOutputStream().write(cmd.getBytes());
    if ((su.waitFor() != 0) || !device.canRead()
      || !device.canWrite()) {
     throw new SecurityException();
    }
   } catch (Exception e) {
    e.printStackTrace();
    throw new SecurityException();
   }
  }

  mFd = open(device.getAbsolutePath(), baudrate);
  if (mFd == null) {
   Log.e(TAG, "native open returns null");
   throw new IOException();
  }
  mFileInputStream = new FileInputStream(mFd);
  mFileOutputStream = new FileOutputStream(mFd);
}

public InputStream getInputStream() {
return mFileInputStream;
}

public OutputStream getOutputStream() {
return mFileOutputStream;
}

//JNI
private native static FileDescriptor open(String path, int baudrate);
public native void close();
static {
System.loadLibrary("serial_port");
}
}

####################################

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
* LINUX下串口打印接口
* @author douk
*
*/
public class PrintClass {

//输入流
private static InputStream in;
//输出流
private static OutputStream out;

private static final String PORT = "/dev/ttyS2";//串口

private SerialPort serialPort;

/**
* 连接串口
*/
private void Connect()
{
  try {
   serialPort = new SerialPort(new File(PORT), 38400);

   in = serialPort.getInputStream();
   out = serialPort.getOutputStream();

  } catch (SecurityException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
}

/**
* 关闭串口
* @throws IOException
*/
public void CloseSerialPort()
{
  try {
   out.close();
   in.close();
   serialPort.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
}

}