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Garmin protocol problem

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Bruce Stemplewski

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May 11, 2008, 9:26:16 AM5/11/08
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I have been notified of a problem with my OCX where getting datetime
form the GPS fails. I checked into it and noticed that getting position
also fails.

I set up a test program using the sample code found on Garmin's website.
This code is also experiencing a similar problem.

The USB packet is supposed to have a 14 (hex) 20 (decimal) as the first
byte of the packet. Periodically, this byte is dropped. It may take
50000+ iterations but it will fail eventually. Has anyone else seen
this behavior?

It seems like this might actually be a problem with the USB driver or GPS.


I have seen the problem, so far with the GPS 18 and GPSMap 76C

--
Bruce E. Stemplewski
GarXface OCX and C++ Class Library for the Garmin GPS
www.stempsoft.com

J-@-ck

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May 12, 2008, 9:15:32 AM5/12/08
to
Bruce Stemplewski a écrit :

>
> I have been notified of a problem with my OCX where getting datetime
> form the GPS fails. I checked into it and noticed that getting position
> also fails.
>
> I set up a test program using the sample code found on Garmin's website.
> This code is also experiencing a similar problem.
>
> The USB packet is supposed to have a 14 (hex) 20 (decimal) as the first
> byte of the packet. Periodically, this byte is dropped. It may take
> 50000+ iterations but it will fail eventually. Has anyone else seen
> this behavior?
>
> It seems like this might actually be a problem with the USB driver or GPS.
>
>
> I have seen the problem, so far with the GPS 18 and GPSMap 76C
>
>
>

I also have problem with my old Garmin GPS II Pilot and unable
to do the update ...even if it was prepaid. Then Garmin is now
on my blacklist ;-(

--
J-@-ck

Bruce Stemplewski

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May 12, 2008, 8:47:25 PM5/12/08
to
J-@-ck wrote:

>
> I also have problem with my old Garmin GPS II Pilot and unable
> to do the update ...even if it was prepaid. Then Garmin is now
> on my blacklist ;-(
>


Our issues have nothing in common. The GPS II is serial. My issue is
with the Garmin USB protocol.

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