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Thread: Renault Scenic II - SPDIF PC

  1. #11
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    Quote Originally Posted by LagunaICE
    I am very interested in hearing more on this. Can the trick be done on HU without an actual CD changer beeing connected or not?
    Only if you emulate the CD changer. So far, only the connects2 device is known to work, but I think it could be done with a PC
    Vicne, could you post more detailed pics and changer hack pinout diagram for us?
    BTW I have a "Tuner List" ...
    Here's the pinout. Nothing special as you can see. What pictures exactly are you interested in ?
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  2. #12
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    Quote Originally Posted by mox
    Um, no Actually I am sort of hoping for you to come up with a cool $5 PIC-based interface in the near future My experience with PICs is still next to zero, but I intend to learn more about them, e.g. by building a little development kit and starting off with a simple project.
    Well, although I learned PIC programming at school, it's now nearly ten years ago and I have no experience and no material to program PICs, so definitely, I'll do it with a PC serial port or I won't do it at all... By the way, you mentioned "D2B" but are you sure it's the protocol used here ? 5 minutes google search for D2B makes me think it's a very generic protocol, much more than what I'd expect for a simple CD-changer/headunit dialog...
    The OEM display in my Clio's dash is somewhat limited, as it only displays track# and cd#, so no remaining time or anything. I guess the ppl of connects2.com have found a way to mimic a single cd with a single endless track. Once I select the cd changer as a source, the HU permanently displays "CD1 - TRACK 1".
    Somehow I am glad my display is limited
    The more I think about the problem, the more I think it would make sense that once the head unit source is switched to a CD changer, it delegates all CD handling to the changer and only "passes through" commands from its front panel to the changer and replies back to its display. In that case, the only thing that *has* to be implemented is the "handshake" protocol so that the head unit always thinks that there is a changer present. Then maybe send a static "CD 1 - Trank 1 - Time 0:00" and off we go...

  3. #13
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    Quote Originally Posted by Vicne
    By the way, you mentioned "D2B" but are you sure it's the protocol used here ? 5 minutes google search for D2B makes me think it's a very generic protocol, much more than what I'd expect for a simple CD-changer/headunit dialog...
    I vaguely remember reading something on planeterenault.com about the highly popular CHM 604 mp3 cd changer using the D2B protocol. It might as well have been a German site, I can't remember

    Since I've already settled for using my 89 euro Connects2 adapter, I was pondering some kind of smart processor driven interface between stalk control, PC and HU. Purpose of the interface would be to relay stalk commands to the HU by default, unless a certain stalk switch combination or sequence is given (e.g. pressing "source up" and "source down" simultaneously). The interface should then disconnect from the HU and pass controls to the PC instead. By using the interface to translate stalk keypresses into serial data (like an IR remote control), you could then use a serial port and Girder to control whatever application you like

    BTW, FYI, here are the main components used in the Connects2 interface (I did some reverse engineering on the hardware).

    Analog-to-SPDIF:
    TL064 (stereo AF amp), linked to a 5331AKS (stereo A/D converter with serial output), linked to a CS8405A (SPDIF encoder), linked to the HU's SPDIF input.

    UART control port:
    ST72C314J4 (some flash microcontroller), linked to a BA8270F ("Bus Interface for Car Audio") which connects to the HU's UART lines.

    Datasheets of these chips can be found online. Let me know if you have trouble finding them. Given your theory about the protocol, the BA8270F might be particularly interesting, as the datasheet states that it's an interface *master*
    CarPC status: HW all done, SW needs tweaked.
    Hardware: VIA MII-12K, 512MB, 60GB 2.5", CW-8123 DVD-CDRW, 7" Lilli ts, Opus 90W, BU-353 GPS, 802.11b PCI, USB bluetooth dongle, AverMedia AverTV Cardbus Plus, Morex Cubid 3677
    Software: RR, MM/FD

  4. #14
    mox
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    Quote Originally Posted by Vicne
    My best bet for now would to fix the screen to a big clip that would "bite" the top of the Scenic's dashboard to have the screen almost at the same place as the factory GPS option
    I am also avoiding any mods to my Clio here. Furthermore, I wanted the monitor to be removable at all costs. I am quite fond of this (anodized!) aluminum bracket that I've made for my 7" lilliput. The ugly black round cable will soon be removed, as all necessary connections will eventually be made thru the 15 pin D-sub connector which plugs into a connector that I've mounted into a little coins tray in my dash (I bought the original Renault spare part ).

    The flatcable will go through a slot in the back of the monitor and be soldered internally. Will post more pics soon.
    Attached Images Attached Images  
    CarPC status: HW all done, SW needs tweaked.
    Hardware: VIA MII-12K, 512MB, 60GB 2.5", CW-8123 DVD-CDRW, 7" Lilli ts, Opus 90W, BU-353 GPS, 802.11b PCI, USB bluetooth dongle, AverMedia AverTV Cardbus Plus, Morex Cubid 3677
    Software: RR, MM/FD

  5. #15
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    Quote Originally Posted by mox
    I was pondering some kind of smart processor driven interface between stalk control, PC and HU. Purpose of the interface would be to relay stalk commands to the HU by default, unless a certain stalk switch combination or sequence is given (e.g. pressing "source up" and "source down" simultaneously). The interface should then disconnect from the HU and pass controls to the PC instead. By using the interface to translate stalk keypresses into serial data (like an IR remote control), you could then use a serial port and Girder to control whatever application you like
    I see... Interesting idea indeed. The source up+down might not be possible on all units (mechanically, on both my headunit and my stalk controls, the up and down are mutually exclusive) but I see the idea.

    BTW, FYI, here are the main components used in the Connects2 interface (I did some reverse engineering on the hardware).
    Analog-to-SPDIF:
    TL064 (stereo AF amp), linked to a 5331AKS (stereo A/D converter with serial output), linked to a CS8405A (SPDIF encoder), linked to the HU's SPDIF input.
    That's interesting for anyone wanting just to connect a mp3 player to the head unit letting the control cables run to the changer as I did...
    UART control port:
    ST72C314J4 (some flash microcontroller), linked to a BA8270F ("Bus Interface for Car Audio") which connects to the HU's UART lines.

    Datasheets of these chips can be found online. Let me know if you have trouble finding them. Given your theory about the protocol, the BA8270F might be particularly interesting, as the datasheet states that it's an interface *master*
    Well, yes...
    Unfortunately, this doesn't give explanations about the actual protocol, but better than nothing. Thanks for all this information, I just cross-posted it to planeterenault.com - hope you won't mind, I should have asked before ...

    Vicne.

  6. #16
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    Quote Originally Posted by Vicne
    Thanks for all this information, I just cross-posted it to planeterenault.com - hope you won't mind, I should have asked before ...
    No problem at all and thanks for translating it to French
    CarPC status: HW all done, SW needs tweaked.
    Hardware: VIA MII-12K, 512MB, 60GB 2.5", CW-8123 DVD-CDRW, 7" Lilli ts, Opus 90W, BU-353 GPS, 802.11b PCI, USB bluetooth dongle, AverMedia AverTV Cardbus Plus, Morex Cubid 3677
    Software: RR, MM/FD

  7. #17
    mox
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    Quote Originally Posted by Vicne
    mechanically, on both my headunit and my stalk controls, the up and down are mutually exclusive
    Ah, ok, you have some kind of rocker switch. Mine aren't mechanically linked.
    That's interesting for anyone wanting just to connect a mp3 player to the head unit letting the control cables run to the changer as I did...
    I will see if I can reproduce a schematic of the SPDIF encoder part. I'm hampered by the SMDs and the double sided circuit board, though .
    CarPC status: HW all done, SW needs tweaked.
    Hardware: VIA MII-12K, 512MB, 60GB 2.5", CW-8123 DVD-CDRW, 7" Lilli ts, Opus 90W, BU-353 GPS, 802.11b PCI, USB bluetooth dongle, AverMedia AverTV Cardbus Plus, Morex Cubid 3677
    Software: RR, MM/FD

  8. #18
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    Quote Originally Posted by mox
    I will see if I can reproduce a schematic of the SPDIF encoder part.
    I'm sure that will help a few people, indeed...
    I'm hampered by the SMDs and the double sided circuit board, though .
    Yes, I think this SPDIF chip is only available as SMD, unfortunately, so better have serious soldering skills before trying to make a DIY converter...

  9. #19
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    Quote Originally Posted by mox
    Furthermore, how can I get the audio line-in (and the mic input) of the epia to be mixed into the SPDIF output?

    EDIT: I did a search on the analog input issue. There doesn't seem to be a solution yet. A software pass-thru might do the trick, but it will increase cpu load. Anyone?
    After a bit of search, I found the "FullDuplexFilter" sample of the DirectX sdk : It records what comes in through the Mic and plays it back after 1 second.
    I don't have a Windows development environment handy, but I think it'd be fairly easy to modify it to have it sample the line-in also, reduce the delay to the minimum and remove all the selection part of the GUI.

    I believe its CPU use would be next to zero as it only copies incoming buffers to the output without any processing...

  10. #20
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    Sorry for the late reply, I was on holiday.
    Great find, Vicne -- I'm not sure which frontend you are using, but maybe we can ask Guino to add full duplex support to his RoadRunner. I don't have any development stuff installed either. Actually I'm not much of a programmer at all. I got stuck in the Motorola 6502/6809/68000/68HC11 assembly era
    CarPC status: HW all done, SW needs tweaked.
    Hardware: VIA MII-12K, 512MB, 60GB 2.5", CW-8123 DVD-CDRW, 7" Lilli ts, Opus 90W, BU-353 GPS, 802.11b PCI, USB bluetooth dongle, AverMedia AverTV Cardbus Plus, Morex Cubid 3677
    Software: RR, MM/FD

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