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PIC18F2550 SD/MMC card

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ahmet2004

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pic18f2550 sd

I am using a PIC18F2550 to interface with a SD/MMC card. My system needs to be able to use high capacity cards (1GB+) and must also allow them to be interfaced with a Windows system.
The FAT16 file system can reference a maximum of 32MB if 512byte block sizes are used, however if larger block sizes are used then this increases. Is it possible to use 16kB block sizes (to allow for 1GB cards) but only transfer this from the PIC 512bytes at a time?
 

pic18f2550 sd card

Hi, Yet its possible but the card will be very inefficient if you store large number of files, since all files smaller than 16K will eat up 16 K of memory. If you only store one or a few large files its the option to go for !.

Paul.
 

pic18f2550 sd speed

yes 16k blocks are possible..... but with degraded performance......
 

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