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Question About USB Flashs

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kazimanwar

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Hi....well i need basic info about how data can be read from a USB flashdrive...meaning a file with a name and extension e.g. an image file is placed in a USB flash...how this file is allocated in the memory...could one make a linear search for a file in Memory,by its name or its extension?...my basic need are the image files to be read from USB flash...plzzz helppp...
 

Hi!!

First of all, to read a USB flashdrive, you need a Master USB controller (not peripheral controller as many usb controllers are).

After that, you need to implement a FAT Table. You must read about fat table to know how it is saved in the flash drive.

Regards,
 

thxx....but if am using a host controller which have already built in capabilities of FAT system...for example have found an vinculum VNC1L usb host controller which could direclty interface the USB flash drive to Microcontroller...but the prob is that how to read the files via microcontroller...actually am need to read image files n i need to know how to read the Size, Name and other attributes of a file from a USB flash...plz helpp...am in serious need...
 

Hi!!

Read the fat table (in fat specifications you can see how to read this things). Depending on fat implementation (FAT, FAT12, FAT16, FAT32...) you need to read one's or anothers blocks...

In microsoft's web you can obtain the FAT specifications...

regards,
 

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