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ZL3AI > APRDIG 26.08.06 03:24l 251 Lines 8982 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 26 #22, 1/2
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Today's Topics:
1. USB host controller chip, and single chip GPS. (Dave Baxter)
2. Re: USB host controller chip, and single chip GPS. (Jason Winningham)
3. RE: USB host controller chip, and single chip GPS. (scott_at_opentrac.org)
4. Tap into in-dash GPS Navigation for APRS? (A.J. Farmer (AJ3U))
5. Re: Tap into in-dash GPS Navigation for APRS? (Tyler Allison)
6. Re: Tap into in-dash GPS Navigation for APRS? (Curt, WE7U)
7. RE: Tap into in-dash GPS Navigation for APRS? (Ron McCoy)
8. RE: Tap into in-dash GPS Navigation for APRS? (Curt, WE7U)
9. RE: Tap into in-dash GPS Navigation for APRS? (Curt, WE7U)
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Message: 1
Date: Tue, 22 Aug 2006 14:01:07 +0100
From: "Dave Baxter" <dave_at_emv.co.uk>
Subject: [aprssig] USB host controller chip, and single chip GPS.
This could be usefull me thinks, to someone who knows how to integrate
the thing....
http://tinyurl.com/rq65j (pdf file)
Two USB ports, one is always a "Host" the other can be a Host, Device or
OnTheGo port.
The route to using USB only GPS's in trackers? Maybe, this is just one
device, seems there are several dozen out there, but many seem to be
fairly power hungry.
Found during an idle lunchtime with a web browser..
I also found something to do with a 62mW GPS receiver chip...
http://tinyurl.com/nljaa (web page)
Like the bit about the "Expensive RS232" interface it does not need...
Pity I don't have the time or facilities to play with this stuff any
more...
73..
Dave G0WBX.
------------------------------
Message: 2
Date: Tue, 22 Aug 2006 08:47:24 -0500
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: Re: [aprssig] USB host controller chip, and single chip GPS.
On Aug 22, 2006, at 8:01 AM, Dave Baxter wrote:
>Maybe, this is just one
>device, seems there are several dozen out there, but many seem to be
>fairly power hungry.
They're not just hungry for power - notice the driver support: VxWorks,
WindowsCE, Linux, etc. They're all full operating systems. There's a
reason they don't offer code for 8 or 12 bit microcontrollers - it won't
fit.
On the other had, for $99 you can get a full linux computer:
http://www.gumstix.com/
About $200 or so will get you a computer with enough peripherals and
attachment points to be useful. They need to work on their physical
mounting provisions (currently, there aren't any), but it's got
potential. Get one with a sound interface and you can theoretically do
linux soundmodem packet with it.
>Like the bit about the "Expensive RS232" interface it does not need...
(:
-Jason
kg4wsv
------------------------------
Message: 3
Date: Tue, 22 Aug 2006 07:58:02 -0700
From: <scott_at_opentrac.org>
Subject: RE: [aprssig] USB host controller chip, and single chip GPS.
I've looked at a few of those. Aside from being a little difficult to
implement in a low-cost device (they all seem to require a full address/data
bus and possibly a DMA controller), the big problem is drivers. Even if
you're running one of the supported operating systems you're still probably
going to have to write a Garmin driver, and possibly a couple of drivers for
non-standard serial converter chips.
Yeah, it's possible, but it's still much easier at this point to go with an
embedded Linux box. If I had time, I'd love to be able to develop a
packaged single-board computer with a couple of good radio interfaces and a
customized Linux build that'd let you do APRS, IRLP, and so forth without a
lot of hassle. But right now I don't have the time for another project of
that scale.
Or maybe it's already been done. I've seen some Linux distros and Knoppix
CDs, but does anyone sell a low-cost Linux SBC that comes with radio
interface hardware?
Scott
N1VG
------------------------------
Message: 4
Date: Tue, 22 Aug 2006 11:35:48 -0400
From: "A.J. Farmer (AJ3U)" <farmer.aj_at_gmail.com>
Subject: [aprssig] Tap into in-dash GPS Navigation for APRS?
Has anyone had success finding a serial port on an OEM in-dash navigation
system? In my case it is in a Dodge and I have found that the manufacturer
is Alpine. I haven't had an opportunity to take it out to see if it has a
serial connector on the back. I doubt that I will get that lucky, but
maybe there are serial pinouts somewhere inside the unit. Has anyone
explored this?
Thanks!
--
A.J. Farmer, AJ3U
http://www.aj3u.com
------------------------------
Message: 5
Date: Tue, 22 Aug 2006 11:57:13 -0400 (EDT)
From: "Tyler Allison" <tyler_at_allisonhouse.com>
Subject: Re: [aprssig] Tap into in-dash GPS Navigation for APRS?
>Has anyone had success finding a serial port on an OEM in-dash
>navigation system? In my case it is in a Dodge and I have found that
>the manufacturer is Alpine. I haven't had an opportunity to take it
>out to see if it has a serial connector on the back. I doubt that I
>will get that lucky, but maybe there are serial pinouts somewhere
>inside the unit. Has anyone explored this?
I know folks have been able to tap into the OnStar system's GPS unit so I
would suspect it's gotta be doable if you can find the right pins.
-Tyler
------------------------------
Message: 6
Date: Tue, 22 Aug 2006 09:03:51 -0700 (PDT)
From: "Curt, WE7U" <archer_at_eskimo.com>
Subject: Re: [aprssig] Tap into in-dash GPS Navigation for APRS?
On Tue, 22 Aug 2006, Tyler Allison wrote:
>>Has anyone had success finding a serial port on an OEM in-dash
>>navigation system? In my case it is in a Dodge and I have found that
>>the manufacturer is Alpine.
>I know folks have been able to tap into the OnStar system's GPS unit so I
>would suspect it's gotta be doable if you can find the right pins.
Does it use an outboard GPS antenna or an outboard GPS engine? If the
latter you might be able to tie directly into NMEA signals on that cable or
connector. If you're real lucky. Of course they could also be using a
different protocol in that case.
--
Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
------------------------------
Message: 7
Date: Tue, 22 Aug 2006 12:13:01 -0400
From: "Ron McCoy" <rmccoylist_at_blueantservices.com>
Subject: RE: [aprssig] Tap into in-dash GPS Navigation for APRS?
My understanding is that you can access the GPS signal by breaking into the
box but that you have to play with the firmware to change from a proprietary
protocol to NEMA, and that breaks the normal OnStar functionality.
-----Original Message-----
>>Has anyone had success finding a serial port on an OEM in-dash
>>navigation system? In my case it is in a Dodge and I have found that
>>the manufacturer is Alpine. I haven't had an opportunity to take it
>>out to see if it has a serial connector on the back. I doubt that I
>>will get that lucky, but maybe there are serial pinouts somewhere
>>inside the unit. Has anyone explored this?
>
>I know folks have been able to tap into the OnStar system's GPS unit so I
>would suspect it's gotta be doable if you can find the right pins.
>
>-Tyler
------------------------------
Message: 8
Date: Tue, 22 Aug 2006 09:45:12 -0700 (PDT)
From: "Curt, WE7U" <archer_at_eskimo.com>
Subject: RE: [aprssig] Tap into in-dash GPS Navigation for APRS?
On Tue, 22 Aug 2006, Ron McCoy wrote:
>My understanding is that you can access the GPS signal by breaking into the
>box but that you have to play with the firmware to change from a proprietary
>protocol to NEMA, and that breaks the normal OnStar functionality.
A page I saw mentioned Motorola binary format. One should be able to
convert that to something usable with a microprocessor.
That's assuming it's not like one of the Trimble binary formats where the
unit has to query the GPS for the data: In that case you'd need to OR the
transmit signals from the box and from your microprocessor together so
either could command the GPS to return a position. A bit of a pain.
If it's a continuous stream of data from the GPS then you just need to tap
into the GPS transmit line and convert it.
Found this, code that switches to NMEA mode for the Motorola:
So you could program a PIC to switch the GPS to NMEA mode, get a position,
then switch it back to Motorola... Probably better to leave it in Motorola
mode and just convert to NMEA on the fly though. That way the OnStar
wouldn't have a fit.
This page talks about a PIC-based project to read the Motorola binary
format:
But this is OnStar, not Alpine, so getting off-topic.
--
Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
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