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  • Logging to the sd card?

    Was wandering if there was any way to log to the sd card and then read the files without taking the card out of the display? Working on a dash project to go with an engine control unit that is arduino based.

  • #2
    Hello BHayes,

    Welcome to the forum!

    If that's the case, I would suggest that you create your own protocol between the host and display. The host (microcontroller) will poll a request (this is a good idea if you are not trying to read the entire contents of the log file on the SD card while the communication is busy) to the display (gen4 display). After that, the display will call a special function that will read the content of the log file on the SD card then send it via serial communication (bigger files might take longer to be transmitted) to the host until all the contents are read.

    This will eliminate the need of taking the card out on the display.


    This could also be done on ViSi-Genie Environment using magic codes.
    Although this requires PRO license, this takes advantage of ViSi-Genie comms protocol.

    These app notes might help you:

    For ViSi Read and Write SD card:
    https://www.4dsystems.com.au/appnote/4D-AN-00077/

    ViSi-Genie Magic How to Read a File:
    https://www.4dsystems.com.au/downloa...161_R_1_02.pdf

    Kindly refer to this thread:
    https://forum.4dsystems.com.au/forum...-cable-utility

    Also, you might want to explore the FAT16 functions.

    For Diablo16: (page 302)
    https://www.4dsystems.com.au/product...ons_R_1_16.pdf

    For PICASO: (page 203)
    https://www.4dsystems.com.au/product...ons_R_6_20.pdf



    The image below is an example of a user-defined communication protocol between host and display(under ViSi Environment).

    Click image for larger version  Name:	final coom.png Views:	1 Size:	307.3 KB ID:	63998

    If you have questions regarding with this thread, feel free to ask.

    Hopefully, this will help you.

    Best Regards,
    Kayven
    Last edited by kayven@4d; 14th June 2018, 11:48 AM.

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