Re: Failed control transfer

From: Daniel O'Connor <>
Date: Wed, 12 Oct 2022 03:56:56 UTC

> On 11 Oct 2022, at 22:12, Hans Petter Selasky <> wrote:
>> What does "usbdump -i usbusX -f Y -s 65536 -vvv" say?
> Maybe you should trace using usbdump from the start of attachment.

Sorry to waste your time I just realised my mistake..

When it was connected to Linux/MacOS a tool automatically ran which silently patched(!) the Cypress FX2 code (it reset the CPU but didn't cause a reconnection so I didn't notice).

After the code is patched the serial number command works (but xc3sprog blows up because it changes the protocol)

Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum