[arch-general] Access for ordinary users to USB FTDI devices

Mr.Elendig mrelendig at har-ikkje.net
Sat Jun 27 12:47:22 UTC 2020

I was just about to reply about it but someone beat me to it:

On 27/06/2020 14:29, Friedrich Romstedt via arch-general wrote:
> Hi,
> Since end of 2019 I am using the PyFtdi Python package by Emmanuel
> Blot to talk to an FTDI chip on some controller board. Documentation
> of PyFtdi is hosted on http://eblot.github.io/pyftdi/. FTDI (Future
> Technology Devices International) chips (and similar chips by other
> vendors) implement an Universal Asynchronous Receiver Transmitter
> (UART) via USB. This can then be used to send messages to the device
> and receive replies. According to
> http://eblot.github.io/pyftdi/installation.html, it is at least on
> Debian and Ubuntu Linux necessary to write an `udev` rules file in
> order to permit ordinary users access to such an USB device. I
> attempted to use PyFtdi on my Arch Linux box (patched daily) as an
> ordinary user, and successfully talked to the device without any
> additional `udev` rule. We (Emmanual and me) would like to find out
> why and how Arch is configured to permit this. As I observed this
> behaviour, I opened Issue #161 on https://github.com/eblot/pyftdi:
> https://github.com/eblot/pyftdi/issues/161. There were some posts by
> Emmanuel and by me, but we didn't achieve anything substantial so far.
> Furthermore, the question arises if there are more places other than
> PyFtdi where this result might be relevant. Finally it might apply
> also to other Linux distributions different from Arch Linux aside
> Debian and Ubuntu; the documentation of pyftdi maybe could be updated
> to reflect this.
> Any pointer is welcome.
> Best wishes,
> Friedrich

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