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neochrome32
Joined: 09 Jun 2013
Posts: 153
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| SDCARD Block Reading |
 Posted: Sat Aug 10, 2013 10:16 pm |
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Sorry to ask, can't get a straight answer or I'm not getting it.
Looking for the CMD command that helps tell me if an SDCARD is in 32BIT addressing mode...
addr 0 is sector 0, addr 512 is sector 1, addr 1024 sector 2......
I found some of the cards are
addr 0 is sector 0, addr 1 is sector 1....
I know there is a SET BLOCK size somewhere (and that works ok)
I have a few 2gig, and 8 SDHC (clearly marked) but i can't figure out when i need to manually use
addr = address <<9
or not bother?
Can someone point me in the right direction or a direct answer?
Greatly appreciated... thanks |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19447
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| Posted: Sun Aug 11, 2013 1:11 am |
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CMD 8, then CMD 58.
A basic SD card won't respond to CMD8.
Read section 4.3, of the SD card physical layer spec (V2).
Then CMD58 reads the memory OCR. Bit 6 of the first byte of this specifies SDHC.
Best Wishes |
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neochrome32
Joined: 09 Jun 2013
Posts: 153
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| Posted: Sun Aug 11, 2013 2:12 am |
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LOVE YOU!!!!! thank you...
gonna take a peak at this now...
been looking at V3 specs..
must have missed it |
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