<NME> README.md
<BEF> ## WALT Latency Timer ##

**DISCLAIMER:** This is not an official Google product.

 * [Post about WALT on Android Developers Blog](http://android-developers.blogspot.ca/2016/04/a-new-method-to-measure-touch-and-audio.html)
 * [Instructional videos showing how to use WALT](https://www.youtube.com/playlist?list=PLd6Fi7WgXfcCEJg1FDqNCoQfpWo7W3J5a)
 * [Detailed usage instructions](docs/usage/WALT_usage.md)
 * Mailing list - [walt-discuss](https://groups.google.com/forum/#!forum/walt-discuss)
 * Low-traffic mailing list for major announcements [walt-announce](https://groups.google.com/forum/#!forum/walt-announce)

 * Screen draw latency - using a photodiode that detects whether the screen is black or white.
 * Audio input / output latencies. Input latency will be usually referred as microphone latency.

Hardware build instructions can be found in this repository under hardware/

TODO: Longer description + principle of operation (link to time sync doc).

## Notes

* The Android device and Teensy clocks have a tendency to diverge due to
  differing clock frequencies. This means they will go out of sync after
  approximately 5 minutes. The workaround is to use the app to re-sync the

The WALT app for Android can be
[installed from Google Play](https://play.google.com/store/apps/details?id=org.kamrik.latency.walt)

## TODO
 * Convert most of the C code to C++
 * Use smaller buffers for audio input (mic)

## Notes
* Hardware build instructions can be found in this repository under `hardware/`.
* Clock synchronization details are described [here](android/WALT/app/src/main/jni/README.md).
* The Android/iOS device and Teensy clocks have a tendency to diverge due to
  differing clock frequencies. This means they will go out of sync after
  several minutes. The workaround is to use the app to re-sync the
  clocks. Some, but not all tests in the app will sync the clocks when starting a measurement.
* Python code used to communicate with WALT from Linux and ChromeOS can be found
  [here](https://chromium.googlesource.com/chromiumos/platform/touchbot/+/master/quickstep/).


<MSG> Update README.md
<DFF> @@ -11,12 +11,9 @@ WALT is designed to measure the latency of physical sensors and outputs on phone
  * Screen draw latency - using a photodiode that detects whether the screen is black or white.
  * Audio input / output latencies. Input latency will be usually referred as microphone latency.
 
-Hardware build instructions can be found in this repository under hardware/
-
-TODO: Longer description + principle of operation (link to time sync doc).
-
 ## Notes
-
+* Hardware build instructions can be found in this repository under hardware/
+* Clock syncrhonization details are described [here](android/WALT/app/src/main/jni/README.md)
 * The Android device and Teensy clocks have a tendency to diverge due to
   differing clock frequencies. This means they will go out of sync after
   approximately 5 minutes. The workaround is to use the app to re-sync the
@@ -26,4 +23,4 @@ TODO: Longer description + principle of operation (link to time sync doc).
 
 ## TODO
  * Convert most of the C code to C++
- * Use smaller buffers for audio input (mic)
\ No newline at end of file
+ * Use smaller buffers for audio input (mic)

Update README.md