Android 通过USB与PLC设备通信(USB转串口)

# usb-serial-for-android This is a driver library for communication with Arduinos and other USB serial hardware on Android, using the [Android USB Host API](http://developer.android.com/guide/topics/connectivity/usb/host.html) available on Android 3.1+. No root access, ADK, or special kernel drivers are required; all drivers are implemented in Java. You get a raw serial port with `read()`, `write()`, and other basic functions for use with your own protocols. * **Homepage**: https://github.com/mik3y/usb-serial-for-android * **Google group**: http://groups.google.com/group/usb-serial-for-android * **Latest release**: [v0.1.0](https://github.com/mik3y/usb-serial-for-android/releases) ## Quick Start **1.** [Link your project](https://github.com/mik3y/usb-serial-for-android/wiki/Building-From-Source) to the library. **2.** Copy [device_filter.xml](https://github.com/mik3y/usb-serial-for-android/blob/master/usbSerialExamples/src/main/res/xml/device_filter.xml) to your project's `res/xml/` directory. **3.** Configure your `AndroidManifest.xml` to notify your app when a device is attached (see [Android USB Host documentation](http://developer.android.com/guide/topics/connectivity/usb/host.html#discovering-d) for help). ```xml <activity android:name="..." ...> <intent-filter> <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" /> </intent-filter> <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/device_filter" /> </activity> ``` **4.** Use it! Example code snippet: ```java // Find all available drivers from attached devices. UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE); List<UsbSerialDriver> availableDrivers = UsbSerialProber.getDefaultProber().findAllDrivers(manager); if (availableDrivers.isEmpty()) { return; } // Open a connection to the first available driver. UsbSerialDriver driver = availableDrivers.get(0); UsbDeviceConnection connection = manager.openDevice(driver.getDevice()); if (connection == null) { // You probably need to call UsbManager.requestPermission(driver.getDevice(), ..) return; } // Read some data! Most have just one port (port 0). UsbSerialPort port = driver.getPorts().get(0); try { port.open(connection); port.setParameters(115200, 8, UsbSerialPort.STOPBITS_1, UsbSerialPort.PARITY_NONE); byte buffer[] = new byte[16]; int numBytesRead = port.read(buffer, 1000); Log.d(TAG, "Read " + numBytesRead + " bytes."); } catch (IOException e) { // Deal with error. } finally { port.close(); } ``` For a more complete example, see the [UsbSerialExamples project](https://github.com/mik3y/usb-serial-for-android/blob/master/usbSerialExamples) in git, which is a simple application for reading and showing serial data. A [simple Arduino application](https://github.com/mik3y/usb-serial-for-android/blob/master/arduino) is also available which can be used for testing. ## Probing for Unrecognized Devices Sometimes you may need to do a little extra work to support devices which usb-serial-for-android doesn't [yet] know about -- but which you know to be compatible with one of the built-in drivers. This may be the case for a brand new device or for one using a custom VID/PID pair. UsbSerialProber is a class to help you find and instantiate compatible UsbSerialDrivers from the tree of connected UsbDevices. Normally, you will use the default prober returned by ``UsbSerialProber.getDefaultProber()``, which uses the built-in list of well-known VIDs and PIDs that are supported by our drivers. To use your own set of rules, create and use a custom prober: ```java // Probe for our custom CDC devices, which use VID 0x1234 // and PIDS 0x0001 and 0x0002. ProbeTable customTable = new ProbeTable(); customTable.addProduct(0x1234, 0x0001, CdcAcmSerialDriver.class); customTable.addProduct(0x1234, 0x0002, CdcAcmSerialDriver.class); UsbSerialProber prober = new UsbSerialProber(customTable); List<UsbSerialDriver> drivers = prober.findAllDrivers(usbManager); // ... ``` Of course, nothing requires you to use UsbSerialProber at all: you can instantiate driver classes directly if you know what you're doing; just supply a compatible UsbDevice. ## Compatible Devices * *Serial chips:* FT232R, CDC/ACM (eg Arduino Uno) and possibly others. See [CompatibleSerialDevices](https://github.com/mik3y/usb-serial-for-android/wiki/Compatible-Serial-Devices). * *Android phones and tablets:* Nexus 7, Motorola Xoom, and many others. See [CompatibleAndroidDevices](https://github.com/mik3y/usb-serial-for-android/wiki/Compatible-Android-Devices). ## Author, License, and Copyright usb-serial-for-android is written and maintained by *mike wakerly*. This library is licensed under *LGPL Version 2.1*. Please see LICENSE.txt for the complete license. Copyright 2011-2012, Google Inc. All Rights Reserved. Portions of this library are based on libftdi (http://www.intra2net.com/en/developer/libftdi). Please see FtdiSerialDriver.java for more information. ## Help & Discussion For common problems, see the [Troubleshooting](https://github.com/mik3y/usb-serial-for-android/wiki/Troubleshooting) wiki page. For other help and discussion, please join our Google Group, [usb-serial-for-android](https://groups.google.com/forum/?fromgroups#!forum/usb-serial-for-android). Are you using the library? Let us know on the group and we'll add your project to [ProjectsUsingUsbSerialForAndroid](https://github.com/mik3y/usb-serial-for-android/wiki/Projects-Using-usb-serial-for-android).