sd spi mode in C language

can i know how can we send data from开发者_如何学C spi to micro sd card in 'C' language

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This page has some good information on MMC and SD cards, along with a link to a "nice breakdown of the SD SPI protocol".

http://www.sparkfun.com/commerce/product_info.php?products_id=136

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For FAT filesystems, you can find some C code from Microchip here, as part of the Microchip Application Libraries.

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If you are using a Microchip microcontroller, Microchip has a set of libraries that include a library that allows access to a MMC / SD card.
it is called Memory Disk Drive (MDD) and can be found here. It works with 8 to 32 bits microcontrollers.