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964 days ago

Changelog History
Page 2

  • v2.1.0 Changes

    November 15, 2019

    ๐Ÿ”‹ features:

    • ๐Ÿ‘ DTR and RTS support for CP21xx drivers
    • reimplemented read timeout. caution: too short timeout can cause data loss, see wiki for details
    • include proguard rules in .aar library to retain driver classes instantiated by UsbSerialProber

    ๐Ÿ›  fixes:

    • ๐Ÿ‘Œ improve error handling in close and more reliably interrupt read and terminate SerialInputOutputManager
    • harmonize + cleanup error messages
    • correct purgeHwBuffers parameter description
    • manage USB permission intent in sample app
    • โœ… more code coverage tests

    ๐Ÿ”„ changes:

    • ๐Ÿ‘ distinguish IllegalArgumentException and UnsupportedOperationException in setParameter
      If you had dedicated handling for IllegalArgumentException, you now have to handle both
    • 0๏ธโƒฃ SerialInputOutputManager now has infinite read/write timeout per default, to prevent data loss
      If you want to use SerialInputOutputManager.writeAsync you should set a readTimeout!=0 before starting the thread
  • v2.0.0 Changes

    October 12, 2019

    ๐Ÿ”€ merged back changes collected in kai-morich's fork

    ๐Ÿ†• new features:

    • support ft_232h, cp210_ multiport devices
    • CH34x: data bits, parity, stop bits
    • CP21xx: mark+space
    • ๐Ÿ‘Œ support USB devices with other non CDC related endpoints
    • ๐Ÿ‘ CH34x: support more baudrates

    ๐Ÿ”„ changes:

    increased minimum Android version to 4.3 (API 17)

    ๐Ÿš€ Always use async read (UsbDeviceConnection.requestWait), as bulkTransfer (UsbDeviceConnection. bulkTransfer) can cause data loss at high baud rates. Before this release only the CdcAcm driver used async read.

    With async read currently read timeout != 0 is ignored. read blocks until data is available (except Ftdi, where status data is available each 16msec).

    ๐Ÿ’ป Instead of using read you can use the asynchronuos SerialInputOutputManager to be notified on available data. SerialInputOutputManager.writeAsync is also affected, as the loop blocks in a read. Instead you can write directly in your UI thread.

  • v0.1.0 Changes

    March 04, 2014

    Version : 0.1.0
    ๐Ÿš€ Release date: November 13, 2012
    Notes : First public release of usb-serial-for-android.

    Quick Start

    1. Download usb-serial-for-android-v010.jar

    2. Copy the jar to your Android project's libs/ directory. (See Android's FAQ for help).

    3. Copy device_filter.xml to your project's res/xml/ directory.

    4. Configure your AndroidManifest.xml to notify your app when a device is attached (see Android USB Host documentation for help).

    \<activityandroid:name="..." ...\> \<intent-filter\> \<action android:name="android.hardware.usb.action.USB\_DEVICE\_ATTACHED" /\> \</intent-filter\> \<meta-dataandroid:name="android.hardware.usb.action.USB\_DEVICE\_ATTACHED"android:resource="@xml/device\_filter" /\> \</activity\>

    5. Use it! Example code snippet:

    // Get UsbManager from Android.UsbManager manager = (UsbManager) getSystemService(Context.USB\_SERVICE);// Find the first available driver.UsbSerialDriver driver = UsbSerialProber.acquire(manager);if (driver != null) {; try { driver.setBaudRate(115200); byte buffer[] = new byte[16]; int numBytesRead =, 1000); Log.d(TAG, "Read " + numBytesRead + " bytes."); } catch (IOException e) { // Deal with error. } finally { driver.close(); } }

    ๐Ÿ‘€ For a more complete example, see the UsbSerialExamples/ project, which is a simple application for reading and showing serial data.

    โœ… A simple Arduino application is also available (in arduino/), which can be used for testing.

    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.

    ๐Ÿ‘€ Portions of this library are based on libftdi ( Please see for more information.

    Help & Discussion

    ๐Ÿ‘€ For common problems, see the Troubleshooting wiki page.

    For other help and discussion, please join our Google Group, usb-serial-for-android.