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Thread: Alpine AINet CRC solved

  1. #11
    Newbie
    Join Date
    Dec 2008
    Location
    Sydney, Australia.
    Posts
    19
    Hi
    I have attached ( I hope) a pdf document with more information about my investigation of the AiNet bus.
    This not complete and I will update as more info and time becomes available.
    Hopefully there is enough info here to get some other people started as well.
    If anyone wants any specific info I have not include yet, please let me know.

    CK.

    21/01/2009 Have made additions to attachement, please see later post.

  2. #12
    Low Bitrate
    Join Date
    May 2004
    Location
    UK
    Posts
    74
    Colin,

    I can see an awful amount of work has gone into this solution already. Given my age, it's nice to see some real logic circuits, as it allows you to grasp the AINet function.

    I can see a PIC-based AINet to RS232 box becoming the friend of many on this site.

    I've done this before with a VW head unit and Girder - using Girder to capture the serial streams from a HU button press - whilst the "housekeeping" data has been filtered.

  3. #13
    Newbie
    Join Date
    Dec 2008
    Posts
    17
    Did you know anything about the Navigation Cabel and the RGB input?

    The main question is for me, will alpine transfer the ,,touch" position from a headunit to the navi via AiNet Protocol or use they anything else?

    the idea behind is to use a alpine wgva monitor for output the pc screen and use the touchscreen for mouse control.

    i find the following things for now:

    - your AiNet Protocol
    - Vga2RGB TTL Converter

  4. #14
    Low Bitrate
    Join Date
    May 2004
    Location
    UK
    Posts
    74
    Must say I'm suprised to see this thread not capturing more interest.

    I know there is a large PHA H-701 userbase, who I'm sure would love to control the basics through a PC and not the RUX controller.

    So, I'm bumping to see who else gets this...

    Colin, any luck with a PIC based unit?

  5. #15
    Newbie
    Join Date
    Dec 2008
    Location
    Sydney, Australia.
    Posts
    19
    Hi Tony,
    Sorry I have not posted anything new for a while, but I have been away for the last three weeks and could not post.

    I am back now and working on the AiNet project again. I had to change to a PIC24 to get the performance I needed, so I thought I might as well use the hardware CRC generator available in the PIC24. Well it sounded like a good idea at the time, but I am having a hell of a time getting it to work, may have to go back to firmware CRC generation (it works fine, but is a bit slow).

    I am hoping the PIC24 will allow me to do all the work in the PIC with minimal external hardware, and have finalised the PWM code for tranmission and will be starting on the receiving code shortly.

    Hopefully I can post an update in the next week or so.

    Cheers,
    Colin.

  6. #16
    Newbie
    Join Date
    Dec 2008
    Posts
    17
    @Viper

    is it posible to read the touch position from the AiNet and make a USB Mouse Converter?

  7. #17
    Newbie
    Join Date
    Dec 2008
    Location
    Sydney, Australia.
    Posts
    19
    Operator,
    At this stage I have only looked at the CD changer commands, so I am sorry, but I do not know the answer to your question.
    If I had to make a guess, I would not think that information would be sent over the AiNet bus, but as I said so far I have only looked at CD changer.

  8. #18
    Newbie
    Join Date
    Mar 2009
    Posts
    9
    wow, I can't believe some headway has been made in this area. I researched this for ages a while back and had completely given up hope. I would love you forever if you made it possible for me to control a carpc with my HU.

    Sooooo excited. haha.

  9. #19
    Newbie
    Join Date
    Mar 2009
    Posts
    2
    Dear Viper,

    you write you have an modified code to calculate the crc-checksum. What have you modified? Im to stupid, everything i calc, the crc is different.

    Pleeeeaaase help me

    Cheers
    Micheal

  10. #20
    Newbie
    Join Date
    Mar 2009
    Posts
    2
    Hello Collin,

    great, you are my Hero ;-).....it works! A simple failure by translation to arm-bascom was the bug. Now i become the ´right crc for all my codes.

    I work on an universal hardware-interface based on ai-net. My ideas:

    Emulate an dvd-changer on the HU and use the alpine user-interface for an HDD-Player.

    Use Alpine Units (dvd-players, changers, processors) at non-ai-net HUs.

    At the moment i use an atmega 168/20 at 16Mhz. Till today i must store the crc´s to each command in eeprom, tomorrow it works free with all codes i believe.

    Cheers
    Micheal

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