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Apr 22, 2008 6:11pm
Img_missing_medium mattpease 2 posts

Hello Buglab -

What chip is inside the buglocate module? Is it a sirf star III?

Also, we need access to satellite pseudorange data. We want to build a logger that logs this data for later post-processing of GPS data.

To get at this data, we need to send the GPS SIRF binary commands.

And we’ll need to read the unfiltered sirf binary stream off the chip.

Does someone at Bug Labs know if the BugLocate module will do this?

Thank you-
Matt

Apr 22, 2008 10:21pm
Medium Bug Labs team kschultz 107 posts

Matt,

More details are on the wiki here, including a link to the chipset manufacturers page with specs. It is a SiRF based chip. At the Java level there is not an inferface yet for what you are looking for, the inferface is only provides a position in a DD Lat/Lon position object. No meta-data or raw data is passed up to Java apps. That is something that would have to be added to the JNI driver, but it should be possible with some additional code. As for how complex a task that is, I believe Angel (aroman) is the one who did the GPS driver so he would know more about that.

Hope that helps some,
Apr 22, 2008 11:24pm
Img_missing_medium mattpease 2 posts

Hi Kevin -

Thanks for the information.

It sounds a little painful. How would I get in touch with Angel?

Thank you-
Matt

Apr 23, 2008 6:33am
Medium Bug Labs team agordon 74 posts

Angel monitors these forums. I believe he is also sometimes on the #buglabs IRC channel on freenode.

Apr 23, 2008 12:24pm
Img_missing_medium aroman 21 posts

Hi Matt,

It’s a jupiter 32 chip and it is Sirf Star III. The product briefing is available here: www.navmanwireless.com/uploads/UT/hj/UThjwbdg2_…

By default the output of the gps module is set to NMEA 0813 and you can request an input stream to the raw data by using the INMEARawFeed OSGi service. To answer your question, the chip does support the Sirf Binary protocol.

There are ways to communicate directly with the GPS from Java, however, they are not exposed as OSGi Services. Could you open a feature request in bugzilla ( bugcommunity.com/bugzilla/ ) to add an OSGi service that supports Sirf Binary Protocol communications with the GPS?

A brief overview on how java access to our modules work:

Most of our hardware modules are represented by one or more linux character device drivers.

Each of these device drivers are accessible via a Java class called CharDevice. CharDevice mirrors the Linux character device driver interface: open(), read(), write(), close(), etc.

A CharDeviceInputStream can wrap a CharDevice to provide an InputStream to the device driver.

Based on this InpuStream we provide OSGi services tailored to the hardware module. For examples, the INMEASentenceProvider allows the client to get an RMC sentence object from the GPS input stream which in turn can be queried for latitude and longitude. However, if the client desires access to the raw data they can get an input stream to the output of the GPS via the OSGi service INMEARawFeed.

You are the first person that I know of requesting access to the Sirf Binary Protocol. However, as you can probably imagine, the architecture allows you to read and write bytes to the GPS module (CharDevice::read() CharDevice::write()) directly therefore supporting the Binary Protocol at this level from Java; It just needs to be carefully wrapped up into an OSGi service.

If you don’t mind, please open a feature request in our bugzilla.

I hope this information was useful to you and anyone that is interested.

Regards,
Angel

Apr 23, 2008 7:05pm
Medium Bug Labs team kschultz 107 posts

Take a look at this:

http://buglabs.net/applications/akravets/GPSRaw…

Thanks Alex

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