Drivers for new computers...

General discussions about V-USB, our firmware-only implementation of a low speed USB device on Atmel's AVR microcontrollers
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Drivers for new computers...

Post by Ali » Sun Nov 12, 2006 11:14 pm

Here is my problem...

I have built my self an AVR USB programmer; it nicely works on older computers with socket A, 939pin 64 bit (nVidia chipset)... But I have a laptop with Intel centrino technology (DELL latitude D510). When I connect the programmer to laptop it says UNKNOWN DEVICE, please reconnect device or replace it, and I get the same error on INTEL CORE DUO computer which is old approximately two months, both computers has an Intel chipset!!

And I have the same problem with Igor Cesko USB IR receiver!


LP Ali

Objective Development
Objective Development
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Joined: Thu Nov 09, 2006 11:46 am

Post by christian » Mon Nov 13, 2006 11:37 am

Did you insert a 3.3 V regulator in the processor's supply or take other measures to reduce the voltage levels on D+ and D-?

There are chipsets which accept 5 V levels on USB and others where the input comparator's common mode range is exceeded. These other chipsets don't accept 5 V levels.

If you don't want a regulator, there are two "hacks" to reduce the voltage on D+ and D-: Either you insert two series diodes in the supply instead of the regulator, or you add 3.6 V Zener diodes to limit the voltage at D+ and D-. See for instance the AVR-Doper project.


Re: Drivers for new computers...

Post by Yof » Mon Nov 20, 2006 6:19 pm

I hade a similar problem and fixed it by setting the Security and COnfiguration Bits in the chip.

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