Application:AccelService

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AccelService - Version: Pre-Alpha 0.0.3
(7 Aug 2009)

Deprecated

This service is deprecated, and has been removed from the feeds. WebOS 1.3.5 and above include an official API for adjusting the accelerometer resolution. The StageController.setWindowProperties() method now supports the fastAccelerometer property to increase the frequency of accelerometer events from 4Hz to 30Hz.

Summary

This service provides access to the accelerometer driver's poll_interval parameter. As of webOS 1.1.0, this interval is not accessible from application development and is set to 250ms. This makes most accelerometer driven applications choppy and slow. With this service, the poll_interval can be changed dynamically by the application.

The four methods exposed to the user are:

getPollFreq()  
returns the frequency in HZ of the accelerometer events
getPollPeriod()  
returns the period in ms of the accelerometer events
setPollFreq(freq)  
sets the frequency in HZ of the accelerometer events
setPollPeriod(period)  
sets the period in ms of the accelerometer events

NOTE: This service does not modify the hardware, it simply increases the rate at which the driver sends accelerometer events to the application handlers listening for the 'acceleration' event.

Status

This is early-alpha software.

Repository

AccelService is housed in the Applications section of the Webos-internals repository at Gitorious. http://gitorious.org/webos-internals.

Source code for the example Mojo app can be browsed at http://gitorious.org/webos-internals/applications/trees/master/org.webosinternals.accelexample

Source code for the service can be browsed at http://gitorious.org/webos-internals/applications/trees/master/AccelerometerService

License

Please be aware that org.webosinternals.accelservice and org.webosinternals.accelexample are licensed under the GPLv2.

They cannot be used by a closed source application. If you want to use them in a non-GPLv2 but otherwise open source application, please contact the authors.

Operating notes

Recent enhancements

Known bugs

Installation

You can install it from Preware.

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