android USB串口通信工具类
时间: 2023-08-29 08:11:59 浏览: 142
为了在Android设备和其他设备之间进行串口通信,可以使用Android USB Host API和USB串口转换器。下面是一个简单的工具类,可以实现Android设备和串口设备之间的通信。
```java
import android.content.Context;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.util.Log;
import java.util.HashMap;
import java.util.Iterator;
public class UsbSerialUtil {
private static final String TAG = "UsbSerialUtil";
private static final int TIMEOUT = 1000;
private static final int BAUD_RATE = 9600;
private UsbManager mUsbManager;
private UsbDevice mDevice;
private UsbDeviceConnection mConnection;
private UsbInterface mInterface;
private UsbEndpoint mEndpoint;
public UsbSerialUtil(Context context) {
mUsbManager = (UsbManager) context.getSystemService(Context.USB_SERVICE);
}
public void openSerialPort() {
HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while (deviceIterator.hasNext()) {
UsbDevice device = deviceIterator.next();
if (device.getVendorId() == VENDOR_ID && device.getProductId() == PRODUCT_ID) {
mDevice = device;
break;
}
}
if (mDevice == null) {
Log.e(TAG, "Device not found");
return;
}
mInterface = mDevice.getInterface(0);
mEndpoint = mInterface.getEndpoint(0);
mConnection = mUsbManager.openDevice(mDevice);
mConnection.claimInterface(mInterface, true);
mConnection.controlTransfer(0x21, 34, 0, 0, null, 0, TIMEOUT);
mConnection.controlTransfer(0x21, 32, 0, 0, new byte[]{(byte) (BAUD_RATE & 0xff),
(byte) ((BAUD_RATE >> 8) & 0xff), (byte) ((BAUD_RATE >> 16) & 0xff),
(byte) ((BAUD_RATE >> 24) & 0xff)}, 4, TIMEOUT);
}
public void closeSerialPort() {
mConnection.releaseInterface(mInterface);
mConnection.close();
}
public void send(String data) {
byte[] bytes = data.getBytes();
mConnection.bulkTransfer(mEndpoint, bytes, bytes.length, TIMEOUT);
}
public String receive() {
byte[] buffer = new byte[64];
int bytes = mConnection.bulkTransfer(mEndpoint, buffer, buffer.length, TIMEOUT);
return new String(buffer, 0, bytes);
}
}
```
其中,VENDOR_ID和PRODUCT_ID可以根据实际的串口转换器进行设置,BAUD_RATE设置为串口设备的波特率。使用时,可以先调用openSerialPort()方法打开串口,然后使用send()方法发送数据,使用receive()方法接收数据,最后调用closeSerialPort()方法关闭串口。
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