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Author Topic: libusb not showing devices  (Read 4470 times)

Offline gadget42

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Re: libusb not showing devices
« Reply #15 on: April 18, 2022, 10:21:50 AM »
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The fluctuation theorem has long been known for a sudden switch of the Hamiltonian of a classical system Z54 . For a quantum system with a Hamiltonian changing from... https://forum.tinycorelinux.net/index.php/topic,25972.msg166580.html#msg166580

Offline kkrpeq

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Re: libusb not showing devices
« Reply #16 on: May 02, 2022, 08:38:20 PM »
I have tried a bunch of different bootcodes, but none worked.
What did work was shortening the USB cable of DeviceB. Although the original cable length was within the specs of USB 2.0, I suppose the USB controller in the Pi needs a very clean signal to work properly, and the controller could not handle the signal noise and loss induced by the cable. In this sense, the USB hub acts as a "repeater", "cleaning" the digital signal.
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Offline Rich

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Re: libusb not showing devices
« Reply #17 on: May 02, 2022, 09:03:22 PM »
Hi kkrpeq
Quote from: kkrpeq on May 02, 2022, 08:38:20 PM
... What did work was shortening the USB cable of DeviceB. Although the original cable length was within the specs of USB 2.0, ...
It may just have been a defective cable.
« Last Edit: May 02, 2022, 09:57:37 PM by Rich »
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