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03-05-2006, 03:00 PM
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#316
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Constant Bitrate
Join Date: Feb 2006
Posts: 113
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Quote: Originally Posted by Vicne
OK. I'll do it as soon as you have tested it.
Well, that's the actual program I used to do the test, so it works 
However I'll do no more tests until I find some optocouplers...if I can resist doing no further tests 
Quote:
You are right, maybe I should describe my setup a bit.
The carPC isn't running on an inverter. It has a M1-ATX as DC/DC converter
Well, that's an inverter, but it's possible that it keeps the same ground as the car. In my case is a double inverter: 12V to 220v (and maybe the ground goes straight to one of the 220V socket) and then the laptop brick, so I'm not surprised the grounds (and all other levels) are messed up. Until today I had only tested with the laptop battery.
Quote:
and has worked with SPDIF (and the actual CDC for Data) for nearly a year now without a single problem (but SPDIF GND is not connected to the common GND of the PC.
you mean the epia has an isolation transformer? or is the HU that has an isolation transformer on input?
Quote:
Now I don't think connecting the adapter to the car PC can make things worse, except for a ground loop maybe...
well, it depends on how your power supply works, if it's as descripted in the VWCDPIC project it's not going to work (though I don't think you'll fry your serial port, I didn't fry mine after all and with a worse setup)
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03-05-2006, 05:03 PM
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#317
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Variable Bitrate
Join Date: Apr 2005
Location: Belgium
Posts: 325
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Quote: Originally Posted by pippolippi
Well, that's the actual program I used to do the test, so it works
However I'll do no more tests until I find some optocouplers...if I can resist doing no further tests
So, your setup works or it doesnt't ? I admit I'm a bit lost... :-)
Quote:
Well, that's an inverter, but it's possible that it keeps the same ground as the car. In my case is a double inverter: 12V to 220v (and maybe the ground goes straight to one of the 220V socket) and then the laptop brick, so I'm not surprised the grounds (and all other levels) are messed up. Until today I had only tested with the laptop battery.
Oh, I see : it works with laptop on battery and doesn't once you use the inverter ?
Quote:
you mean the epia has an isolation transformer? or is the HU that has an isolation transformer on input?
No idea :-)
I just let this ground alone. Maybe I could have connected it to the car's ground, but I didn't see the point in doing that...
Quote:
well, it depends on how your power supply works, if it's as descripted in the VWCDPIC project it's not going to work (though I don't think you'll fry your serial port, I didn't fry mine after all and with a worse setup)
Well, as far as I remember, the M1 ATX connects the car ground to the motherboard ground, contrarily to what is explained on http://www.k9spud.com/vwcdpic/invertedpower.html
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03-05-2006, 05:44 PM
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#318
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Constant Bitrate
Join Date: Feb 2006
Posts: 113
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Quote: Originally Posted by Vicne
So, your setup works or it doesnt't ? I admit I'm a bit lost... :-)
Oh, I see : it works with laptop on battery and doesn't once you use the inverter ?
Yes, that's it. The program is ok (at least for testing), it's the hardware that has problems when used with the inverter. I'll have to find a way to keep the grounds separated, that means optocouplers. I found that the cny17 (cheap and easy to find) is used in midi intefaces, and since those run at 32500bps it should have no problem managing 9600. I'll see
Quote:
I just let this ground alone. Maybe I could have connected it to the car's ground, but I didn't see the point in doing that...
well, I need those to be separated. It's no good if they're actually the same inside the HU, since it means I'll have to find a way to separate them (I'm referring to spdif, I already know I have to do that for the serial data) or see if the sound card I'll find has an isolation transformer on the spdif output.
And, as confirmed by slimmegane, you should have no problem connecting everything. The problem is only mine  (and for those with a similar setup)
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03-06-2006, 04:08 AM
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#319
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Newbie
Join Date: Feb 2006
Posts: 28
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something beatyful
Hi all,
we are now at the good point.
Sunday morning :
I've enable my CDC emulation;
I've connected my GSM phone trhought bluetooth with my laptop;
Enable SPDIF;
Make a call with my gsm ;
and voila HandFree communication using the HU...
something beatiful....
Another question:
The Pioneer CAD PI180 model send a splashscreen when bootup someone of us can sniff this this frame?suggestions?
bye
pep
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03-06-2006, 04:11 AM
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#320
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Newbie
Join Date: Feb 2006
Posts: 28
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Quote: Originally Posted by pippolippi
Attached is the python program, now with all serial parameters explicitly defined 
BEWARE this is not jaa, so it's just 160 lines of understandable code in a (shock horror) single file
great pippolippi...
pep
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03-06-2006, 05:02 AM
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#321
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Constant Bitrate
Join Date: Sep 2005
Location: Belgium
Posts: 173
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Great, hard and software are almost done and things are starting to work! Time to heat up my soldering station! The only thing is that I'll have a few busy days because I need to start up a project this week and I'm afraid that there will be no time left to work on this one. I'll see what I can do, and I also have a question. Does anybody know if CDC units for Tuner List HU's are compatible with Update List HU's?
Last edited by Putput; 03-06-2006 at 07:33 AM.
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03-06-2006, 05:35 AM
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#322
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Constant Bitrate
Join Date: Feb 2006
Posts: 113
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Quote: Originally Posted by peppuz79
The Pioneer CAD PI180 model send a splashscreen when bootup someone of us can sniff this this frame?suggestions?
Google tells me that the CAD PI180 is an interface for pioneer head units, if it is so it takes over the display completely, so it can display anything it wants.
OTOH we can only display what the tuner list is willing to display.
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03-06-2006, 06:41 AM
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#323
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Variable Bitrate
Join Date: Apr 2005
Location: Belgium
Posts: 325
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Quote: Originally Posted by Putput
Does anybody know if CDC units for Tuner List HU's are compatible with Update List HU's?
According to the table Ale posted here, these original VDO changers are cross-compatible. They may although implement a head unit detection mechanism so we cannot be certain until we try, but I'd be very surprised if it wasn't the same protocol.
Why would they reinvent the wheel and develop different protocols and different CDC just because the HU has a few more features ?
I'd bet the chances are 99.9% that they are electrically compatible and 99% that they are protocol-compatble.
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03-06-2006, 06:47 AM
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#324
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Variable Bitrate
Join Date: Apr 2005
Location: Belgium
Posts: 325
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Quote: Originally Posted by pippolippi
Google tells me that the CAD PI180 is an interface for pioneer head units
Your Google must be better than mine :-)
Do you have a direct link to more information ?
Quote:
if it is so it takes over the display completely, so it can display anything it wants.
OTOH we can only display what the tuner list is willing to display.
Well, the Tuner List obviously can drive the display to show anything (e.g. RDS station name) but unfortunately it seems the CDC protocol they designed cannot carry such free text information. If it did, I suppose their own mp3 CDC would implement it - and it doesn't.
Now the next step might be to hack the yellow connector protocol - just kidding :-)
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03-06-2006, 06:50 AM
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#325
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Variable Bitrate
Join Date: Apr 2005
Location: Belgium
Posts: 325
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Quote: Originally Posted by peppuz79
I've enable my CDC emulation;
I've connected my GSM phone trhought bluetooth with my laptop;
Enable SPDIF;
Make a call with my gsm ;
and voila HandFree communication using the HU...
something beatiful....
Now that's cool.
I just miss Bluetooth :-)
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03-06-2006, 08:59 AM
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#326
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Constant Bitrate
Join Date: Feb 2006
Posts: 113
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Quote: Originally Posted by Vicne
Your Google must be better than mine :-)
Do you have a direct link to more information ?
The second link from this search
Not that I completely understand french but....
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03-06-2006, 09:17 AM
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#329
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Constant Bitrate
Join Date: Feb 2006
Posts: 113
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Quote: Originally Posted by Vicne
Why would they reinvent the wheel and develop different protocols and different CDC just because the HU has a few more features ?
I'd bet the chances are 99.9% that they are electrically compatible and 99% that they are protocol-compatble.
Note that, according to various sites selling interfaces for after market radios, the interface to the display and/or the stalk control actually changed. It doesn't imply that the cdc interface changed too, but it goes to show that they actually do reinvent the wheel from time to time.
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03-06-2006, 09:29 AM
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#330
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Constant Bitrate
Join Date: Feb 2006
Posts: 113
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Quote: Originally Posted by Vicne
If it did, I suppose their own mp3 CDC would implement it - and it doesn't.
From the datasheet of the chm 604 mp3:
If available, ID3 Tag and WMA Text such
as Directory, Artist, Album and Title can be displayed. maybe only with certain vdo-dayton head units? (but they don't tell)
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