HELP to write in SD card

[renato]

Hi.
Im working in projetc to university, more im have dificults to configure PIC 18F4580-I/P.

My problem now is a comunication the PIC and SD card.

Im need record information the sensor in to SD card.

If possible help me, im need one code for the PIC --> WRITE --> SD card.

Im need only WRITE the data in the card.

My codes exemples and testes is bad working.

The format is a FAT 16.

if possible help me from a Library and a exemple the WRITE data to SD card.

10x very much
email -> renato1giga@gmail.com

[asmallri]

There are a couple of ways to deal with this. You could implement the FAT file system on the PIC. If you want to buy a FAT system driver then check out my web site.

An alternative solution is to format the SD card with FAT16 and create a single large empty file on the card in the root directory. Your PIC software needs enough intelligence to locate the directory and locate the file (first entry in the FAT16 directory) to determine the start sector of the file. Your PIC software can now write sequential sectors starting at the first sector of the file. This is far simpler than implementation a full FAT.

When you have finished logging data you can remote the card and read it on a PC. Before you can use the card with the PIC again you will have to reformat the card and create the dummy file again.
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Regards, Andrew

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