AVR-doper

General discussions about V-USB, our firmware-only implementation of a low speed USB device on Atmel's AVR microcontrollers
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sidra
Posts: 2
Joined: Wed Jun 18, 2008 7:37 pm

AVR-doper

Post by sidra » Fri Jun 27, 2008 8:55 am

I bhuilt AVR-Doper(Robotron) PCB but my PC can't recognize them.Simply
I have a massage thet unregonizable hardware is present and this hardware work's not properly. What can be the problem?
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zacharius
Posts: 3
Joined: Thu Jul 17, 2008 9:58 am

Post by zacharius » Fri Jul 18, 2008 6:54 pm

have the same
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Guest

Post by Guest » Sat Jul 26, 2008 9:47 pm

This means that USB hub and OS recognized the pull-up resistor but OS did not succeed in obtaining device's device descriptor. You can verify that by removing the CPU or by keeping it in reset and then pluging it in.
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christian
Objective Development
Objective Development
Posts: 1443
Joined: Thu Nov 09, 2006 11:46 am

Post by christian » Tue Jul 29, 2008 5:40 pm

The most likely cause for this is a voltage level problem on D+ or D-. Please check the idle voltage on D- and ensure it's above 3 V and below 3.6 V.

Other things to try: Different host, insert USB 2.0 hub, swap USB cables etc. If one of these helps, a voltage level problem is very likely.
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brotherhood

Re: AVR-doper

Post by brotherhood » Mon Mar 12, 2012 5:29 am

I have build the doper pcb,after pluging in it wasn´t recognized
After change the usb cable it was,and xp tells a new Hardware was found and can be used.but after a few seconds a pop up tells unrecognized Harware
same thing on other PC what can Happen about it?
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