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Jan Waclawek
08/16/05 11:01
Read: 840 times

#99519 - bit-banging?
Responding to: Chris Lock's previous message
Chris Lock said:
I assumed that it would be possible to implement a master USB using routines and/or embedded hardware in a similar fashion to I2C.

I am afraid, it is impossible to bit-bang a full-speed USB device (at 12MBit/s) - save a high-speed one! - although it IS possible to bit-bang a low-speed USB slave, as demonstrated on AVRs by Igor Cesko.

But there seems to be embeddable USB-host controllers, see Cypress and maybe OKI.

While it is probably not worth bothering with USB drives (as long as there are easier ways), there are interesting USB devices around (cameras, scanners), maybe worth trying to interface them to a microcontroller.

Jan Waclawek

List of 12 messages in thread
8051 USB storage      Chris Lock      08/16/05 09:45      
   8051 USB host?      Dan Henry      08/16/05 10:05      
   Other option      Craig Steiner      08/16/05 10:13      
      Thanks for the pointer!!      Chris Lock      08/16/05 10:31      
         anyhow      Erik Malund      08/16/05 11:00      
         bit-banging?      Jan Waclawek      08/16/05 11:01      
            bit-banging?      Grant Beattie      08/17/05 09:25      
               and unreliable too      Erik Malund      08/17/05 09:34      
   USB "On The Go"      Andy Peters      08/16/05 12:00      
      neither      Erik Malund      08/16/05 12:37      
   How about this?      Andy Neil      08/23/05 07:47      
NOTICE: Message(s) moved      Craig Steiner      08/17/05 15:11      

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