Re: [libusb] Endpoint 0x81 Not Responding

[Alan S. <st...@ro...>]

On Fri, 25 Mar 2016, Phani Kumar wrote:

> Thanks Alan.
> 
> The code is working now and I am not resetting the toggle at all.
> 
> 1. I assume I have to reset the toggle only when an endpoint halts for this
> device?

That's true for all devices, not just yours.

> 2. Usually in our code, we send reset toggle (by clearing halt feature) on
> every pipe initialize. All other devices work with this code. However this
> device is vendor defined and it is not accepting this behavior. How can I
> differentiate this behavior only for this device and how windows works in
> the same scenario? Any idea?

You should never do a Clear-Halt unless you _know_ the endpoint is 
halted.  For any device.

In most cases it won't hurt, but some devices don't handle it 
correctly.

Alan Stern