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SD card writing, no FAT16

 
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magestik



Joined: 16 Oct 2008
Posts: 59

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SD card writing, no FAT16
PostPosted: Tue Jan 13, 2009 8:37 am     Reply with quote
Hello,

I am currently using a PIC16F877A, connected with a SD card 1GB.
However i read on a document that i needed 512 byte of ram in order to read/write a SD card, using mmcsd.c drivers, i don't have this much ram with the 16F877A.

I would like to write data in raw into the SD card, like you write data in an SPI EEPROM. Is it really impossible to do so with this pic ?

I search everywhere with no answer and no help Embarassed.
Help would be greatly appreciated ;)
asmallri



Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia

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Re: SD card writing, no FAT16
PostPosted: Tue Jan 13, 2009 9:52 am     Reply with quote
magestik wrote:
Hello,

I am currently using a PIC16F877A, connected with a SD card 1GB.
However i read on a document that i needed 512 byte of ram in order to read/write a SD card, using mmcsd.c drivers, i don't have this much ram with the 16F877A.

I would like to write data in raw into the SD card, like you write data in an SPI EEPROM. Is it really impossible to do so with this pic ?

I search everywhere with no answer and no help Embarassed.
Help would be greatly appreciated ;)


As you are seen for yourself, a 16F series PIC is not a good candidate for using SD/MMC cards however it is possible. You MUST write 512 bytes at a time (a sector). Let's say you have 100bytes of data to write to the card. You would write out the 100 bytes of data and then write 412 bytes fill bytes.
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http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!
magestik



Joined: 16 Oct 2008
Posts: 59

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PostPosted: Wed Jan 14, 2009 10:59 am     Reply with quote
That's it, thank you ;)
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