Saturday, April 25, 2009

Decoupling

So I've bascially been in my lab non-stop since the last post, trying to figure out why I can't read from the SD card. I tried everything.. adding pull-ups, changing drive currents, putting a decoupling cap across the sd card supply... nothing works, all the signals going into it seem ok. I'm clueless.

The solution? use a BIGGER decoupling cap (1uF vs .1uF). This fixed everything. I seriously want to rip my hair out... in a good way.. i think...

5 comments:

  1. Ah, the difference one decimal can make. :P
    So its reading now?

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  2. it is! soon i will be on the way back to my lab for another grueling session of getting the sram working on my new board. maybe it'll just magically work this time :)

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  3. Hi! I wish you lots of luck!

    Instead of SD card, Have you tried with a Game Boy Advance Flash?

    http://www.neoflash.com/forum/index.php/topic,4643.0.html

    Grettings!

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  4. @Oscar i'm not sure i see any advantage to using a gba flash cart for this project. that being said, it's a very interesting idea.

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  5. Maybe this might help:

    http://www.mash-mods.com/products/Mash-Mods%20Prototypes/portablesnes/images?shiroimamanokami=1&id=4

    Greetings.

    ReplyDelete