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Thread: Understanding the factory CD and boot amp

  1. #21
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    Understanding the factory CD and boot amp

    Last edited by Davezj; 13-11-2015 at 02:36 PM.

    Bye for Now!

  2. #22

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    I have a feeling Mitsubishi just took something off the shelf and branded it. The volumes were too low to justify developing it in house. The Pioneer "P-Bus" has remarkably similar sounding line names to the GTO picture Jason posted:

    Screenshot from 2015-11-13 15:25:41.png

    http://en.calameo.com/read/0012203441b1510fb9c89

    Would be good to open up the amp or headunit and check if there are any Pioneer markings inside. Or at least to see if the main CPU marking could be read. That could help point things in the right direction.
    Last edited by Grid; 13-11-2015 at 04:39 PM.
    The more you know, the faster you can go. And I still don't know enough.

  3. #23
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    When i found my amp under the floor in the boot, I ended up throwing it away after trying to give it away to anyone who wanted it.
    Getting rid of it enabled me to fit a left hand side storage box. And more under floor storage is always nice.
    I still have the 13 pin din cable and the output cable that was connected to the amp in the car.
    If you trash yours trying to get it to work , you can have it if you want it.

  4. #24
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    Just out of interest did the uk spec cars come with the same amp option?
    The reason I ask is because there is a full uk spec galant wiring schematic in the library so it would have the audio wiring in there as well.
    Worth a look.
    Search on username davcom1 and wiring. The original hosting site is long gone but I believe one of the other members is hosting it for the site now.
    It is a 95mb PDF so it is not easy to upload to the library.

    here is one place
    http://www.clubvr4.com/forum/showthr...l=1#post744608

    here is another place
    http://www.clubvr4.com/forum/showthr...l=1#post758511
    Last edited by Davezj; 13-11-2015 at 06:26 PM.

  5. #25
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    @Grid the pin layout is similar but slightly off. I'll pull it apart tomorrow.
    @Davezj I checked out the electrical diagram and sadly it doesn't cover the subwoofer, CD player or amp but good thinking regardless

    Just to add a tiny bit more news, I've got a 13-pin DIN extension cable that I'm gonna chop and fit a breakout board to be able to access the pins easier. Sadly the logic analyser didn't arrive in time, that'll be next week.
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  6. #26

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    More digging

    http://www.mictronics.de/projects/cdc-protocols/

    k7pioneer.jpg

    In fact people have made hard-drive mp3 based CD-changer emulators

    http://vitat.spb.ru/index.php/cat,21.html

  7. #27
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    Thanks @Grid, will update tomorrow with my findings

  8. #28
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    Okay didn't get to take the head unit apart today (weather not great) but I did manage to find time to build this;

    amp-patch-lead-1.jpg amp-patch-lead-2.jpg amp-patch-lead-3.jpg

    That's a 13-pin DIN extension cable with a break-out / interruption jumper set and a line-in socket

  9. #29

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    Nice systematic approach, build the tools first, do research

    I'm way too chaotic to plan ahead like that

  10. #30
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    Quote Originally Posted by Grid View Post
    Nice systematic approach, build the tools first, do research

    I'm way too chaotic to plan ahead like that
    I'm not normally this organised

    Ps. Part 3 is updated

  11. #31
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    CAN-BUS protocol explained

    https://en.wikipedia.org/wiki/CAN_bus

  12. #32
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    Quote Originally Posted by Davezj View Post
    CAN-BUS protocol explained

    https://en.wikipedia.org/wiki/CAN_bus
    I don't think CAN BUS is relevant here, CAN doesn't have a clock line, this seemingly does and pre-dates CAN implementations in cars by about 10 years.

    I've also got a lot of experience with CAN (specifically GMLAN, see below links) so admittedly it was one of my first suspicions (great minds think alike)

    GMLAN Library for MBED
    GMLAN Bible

  13. #33
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    Fair enough, I did read the can bus description and I thought it didn't sit right with what you described as seeing, but it was only when you said that you data was clocked it clicked.
    Yes I have looked at screen shots you uploaded but it still didn't click until now.
    Doh!

  14. #34
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    Are you reading the bits round the correct way, it seems as you are read 0v as logic 1 and 5v as logic 0, from the screen shots in update 3. Is that correct for this application.

  15. #35
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    Heh, I don't know I just based it on the fact the clock line goes low to signal a read.

    Inverted they would read as follows (chars aren't standard ASCII);

    Seq / Binary / Hex

    1. 10010000 = 0x90
    2. 00011010 = 0x1A
    3. 10110111 = 0xB7
    4. 10000010 = 0x82
    5. 11110000 = 0x30

  16. #36
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    Logic analyser is here, well worth a fiver

    Logic-software.png

    Software from Saleae has a built-in protocol inspector too, may help decode it

  17. #37
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    Quote Originally Posted by foxdie View Post
    Heh, I don't know I just based it on the fact the clock line goes low to signal a read.

    Inverted they would read as follows (chars aren't standard ASCII);

    Seq / Binary / Hex

    1. 10010000 = 0x90
    2. 00011010 = 0x1A
    3. 10110111 = 0xB7
    4. 10000010 = 0x82
    5. 11110000 = 0x30
    ok, that make is always an option, what type of probe are you using to connect to the cale is it home made or a proper scope probe. just woundering if you have pos and neg swapped on the probe.
    as having a high signal that goes low to signify a clock not something i have come across as the normal way round. but i have not played with this sort of stuff for years so i am just thinking out loud, and not having the stuff infront of me is a bit of a disadvantage. lol.

  18. #38
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    Quote Originally Posted by foxdie View Post
    Logic analyser is here, well worth a fiver

    Logic-software.png

    Software from Saleae has a built-in protocol inspector too, may help decode it
    what type of probe/cable are you using to connect to the laptop/smartphone.
    that logic analyser software looks great for the money, £5 that is amazing.

    it looks that good i just bought one with some hook up clips.
    Last edited by Davezj; 17-11-2015 at 12:01 AM.

  19. #39

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    Quote Originally Posted by Davezj View Post
    what type of probe/cable are you using to connect to the laptop/smartphone.
    that logic analyser software looks great for the money, £5 that is amazing.

    it looks that good i just bought one with some hook up clips.
    Jason bought a Chinese knockoff of the Saleae Logic analyzer. It's not quite there but it works almost like the real thing, and it is compatible with their official software...

  20. #40
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    I still maintain it's excellent value, works perfectly with the software, although I haven't processed them yet I've grabbed some samples of various things here;

    amp protocol samples

    The channels were as follows;

    • Channel 0 = Pin 9
    • Channel 1 = Pin 10
    • Channel 2 = Pin 11
    • Channel 3 = Pin 13

    You'll need the free Saleae Logic program from above to open the files

    Ps. Yes the probes were the correct polarity Dave, the probes are genuine Tek ones with a clear ground crocodile clip on each one

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