DExx-vd_isl in DE10-Nano GPIO 1 port

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  • #54251
    Calolo
    Participant

    Hello,

    I have ordered a DE10-Nano board for MiSTer and I would like to also use it as a “OSSC Pro Lite” scaler using the DExx-vd_isl board. I don’t plan to add an I/O board so the two GPIO ports will be available.

    It would be great if the SDRAM module and the DExx-vd_isl board could be installed together, then I would only swap the SD cards.

    As the GPIO 0 is already used by the SDRAM module, can we use the GPIO 1 for the DExx-vd_isl board ? If not, is it a hardware or software limitation?

    Thank you.

    #54258
    marqs
    Participant

    That’s one of the things on my TODO after the next fw release. Most likely the board can be used on GPIO1 without issues via an alternative firmware. The audio connector cable would then need to be a bit longer since none of the single column Arduino IO on GPIO1 side are digital pins.

    #54287
    Calolo
    Participant

    Great news, thank you for your reply.

    Maybe you can also make use of the SDRAM for existing or new features?

    #54293
    marqs
    Participant

    The SDRAM has low latency but also low bandwidth (compared to the DDR3 on DE10-Nano) so it’s not really useful for this project.

    I tried today configuring the fw for GPIO1 and it seems to work well. I’ll do some more testing and try to release the image next week.

    #54312
    Obed Samuel
    Participant

    This is great news, I too would be interested in this. Do you think there will be options to add shadow masks eventually? Thanks in advance.

    #54395
    marqs
    Participant

    Github has now a de10n_gpio1 branch for GPIO1 connection. There are 2 ways to take the alternative firmware in use:

    1. Download and write full SD card image from the new branch the same way as described in quick start guide.
    2. If you have already flashed SD image which shows 64MB partition (0.59->), just replace the RBF file on SD card with one from the gpio1 branch

    !!! Please note that the 4-pin audio cable must be connected to the same place as with standard firmware since the single column header on other side has voltage supply pins which can damage the expansion card. The connection thus needs a longer jumper cable or daisy chaining 2 shorter ones. Below is a picture how the card should be connected when using GPIO1.

    DExx_vd-isl connection to DE10-Nano GPIO1. Link to image if not shown.

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