Lpc2000

Hi, 

> > I find that debugging self-powered devices *much* easier than 
> > bus-powered devices.  I recommend that you do this.
> 
> Agree. Using self power allows you to debug through things 
> better because you can handle the connection stuff easier.
>
> Debugging USB is challenging because the timing of the USB 
> protocol prevents you from single stepping/breaking.

Interrupt-driven serial I/O during enumeration is how I debug setup
problems.

> > > Thanks for the suggestions though.
> > 
> > Invest in a USB analyzer is another suggestion.  I can't do without 
> > mine.
> 
> What analyser do you use?

The Ellisys Tracker 110.  Nice piece of hardware, simple to use.

> Something I have found **very** useful is libusb (Google will find). 
> This allows you to do host-side stuff without USB drivers and 
> can make for more controlled test apps etc. 

We found that libusb works well on some PCs with some drivers, and
completely nukes other PCs.

--
Paul Curtis, Rowley Associates Ltd  http://www.rowley.co.uk
CrossWorks for MSP430, ARM, AVR and now MAXQ processors