SDHC (FAT32 for SD cards)

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  1. - 30th August 2009, 15:42 #3
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    Normnet
    Normnet is offline Contributor
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    IF (Your PIC is running at 40Mhz) AND (You are using the DEFINE FS_SPEED) AND (Maybe your PCB and/or wiring isn't quite 'up-to-snuff') THEN
    You may have initialization/writing problems which WILL corrupt your SD card
    ENDIF
    It is recommended to initialize at slower speed and switch to faster for read/writes.
    Also the clock pin sucks power especially with the larger size cards.
    If you are using a resistor voltage divider to convert to 3 volts use lower values to maintain signal strength.

    Is code SPI(one bit at a time) or SD Bus(4 bits at a time) mode?
    CRC(required for SD bus mode)?
    Multiblock read and write for speed?

    Norm
    Last edited by Normnet; - 30th August 2009 at 15:45.
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