Writing to SD card

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  1. - 22nd July 2007, 15:38 #1
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    dhouston
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    Default Writing to SD card

    I have a need to write small amounts of data to an SD card. The data comes in discontinuous flurries of 4 byte chunks and I have about 7mS between chunks to write the 4 bytes to SD (and hopefully to RS232). A normal incident will have a total of 200-532 bytes but there may be incidents that have thousands of bytes.

    The examples I've found so far write 512 bytes at a time, using FRAM or RAM to accumulate a page prior to writing. I'd prefer to write each 4 byte chunk as it occurs.

    Is it possible to write smaller amounts than 512 bytes? Does anyone have a URL to an explanation of reading/writing to SD? Better yet, does anyone have an example of writing small amounts of data to SD?
    www.davehouston.net
  2. - 22nd July 2007, 16:05 #2
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    Have a look at this
    http://www.compsys1.com/workbench/On...c_project.html
  3. - 22nd July 2007, 18:38 #3
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    Quote Originally Posted by bbarney View Post
    Have a look at this
    http://www.compsys1.com/workbench/On...c_project.html
    I had already seen that and I interpreted it as requiring 512 byte writes. Am I misinterpreting it?
    www.davehouston.net
  4. - 22nd July 2007, 19:15 #4
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    Probably not I didn't really read it just thought you might not have seen the site before.this might help even though it's for proton
    Attached Files Attached Files
  5. - 23rd July 2007, 10:09 #5
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    Yes you can!
    Anyway the block must be closed with exactly 512 bytes.
    Absolutely necessary the "ProdManualSDCardv1.9.pdf" from Sandisk
    Regards
    Gianni
  6. - 23rd July 2007, 11:55 #6
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    Quote Originally Posted by GioppY View Post
    Absolutely necessary the "ProdManualSDCardv1.9.pdf" from Sandisk
    Thank you! That looks like a great resource.
    www.davehouston.net
  7. - 23rd July 2007, 17:45 #7
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    Dave here's a link to a newer manual
    http://www.digitalspirit.org/file/?a...dv2.2final.pdf
  8. - 8th November 2007, 01:30 #8
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    Default Proton to PBP

    Quote Originally Posted by bbarney View Post
    Probably not I didn't really read it just thought you might not have seen the site before.this might help even though it's for proton

    Sir that code is cool!!! have you ever tried porting it to PBP? i would like to share it from you ifsoever

    Trully,
    Ryan
  9. - 8th November 2007, 02:11 #9
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    Quote Originally Posted by bbarney View Post
    Dave here's a link to a newer manual
    http://www.digitalspirit.org/file/?a...dv2.2final.pdf
    That link doesn't seem to be working. I did a google search and all links for that file are from
    that website. They must have moved the file.
    DIY kits
  10. - 9th November 2007, 11:04 #10
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    Try http://www.digitalspirit.org/file/in...dv2.2final.pdf

    Bill.
  11. - 9th November 2007, 11:23 #11
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    That link is OK. Thanks!

    Ioannis
    www.signalcom.gr
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