模拟器可以使用PC的串口

2024-07-16 07:52| 来源: 网络整理| 查看: 265

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(); } }

}