Help writing a USB driver

Mercy · 2006-10-10T15:15:27+00:00

Hi all,Any advice/pointers or instructions would be most helpful. I am stilla newbie at embedded design so please humor me.I have a datalogger module written using an Atmel 8051. I want to adda USB port to it so I can simply plug in a USB flash drive and have thedata automatically downloaded as a formatted text file.I have read but I still don't know where to start. Ifsomeone could point me to an online resource or a book... preferrablysomething with similiar applications... that'd be great!Here's a few of my questions.1. If I buy a USB controller such as those provided by Micrel orCypress... do I still need to write a "Host Controller Driver?"2. What parts of the USB protocol do I need to implement, and how muchof it is already implemented by the USB controller and the USB FlashDrive.3. Do I really need to worry about all that protocol timing stuff ...shouldn't the USB controller take care of that for me?4. Assuming that I get the answer to the three questions above, how doI write a TEXT file to a USB flash drive? I know how to do it if I waswriting a windows app... but this is different. Anyone have any idea?Thanks in advance.Mercy

Oct 10, 2006 20 Replies

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Peter Dickerson 19 years ago

Well 'asserted' for CTS# would be low, not high.

[snip]

Peter

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Help writing a USB driver

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