USB-DUX hardware now open source

[Bernd Porr]

Hi all,

as most of you know here on the list I embarked on making dedicated Linux DAQ boards 15 years ago and they have been part of COEMDI / Linux. After 15 years now we are no longer manufacturing them but we've made the PCB designs open source:

https://github.com/glasgowneuro/usbdux

I have still a few USB-DUX-sigma boards without enclosure here. That's the most recent one. Anybody interested in these please get in touch.

Best,

/Bernd

[Thomas Schmidt]

Hi,

is it possible to run usbdux on a raspberry pi? If so, then I'd like to buy at least one of the USB-DUX-sigma boards.

Best,

Thomas

[Bernd Porr]

Hi Thomas,

the PRI team has been working very hard to remove COMEDI from their
custom Kernel. They even removed the config file. I have no idea why
there is such hostility:
https://github.com/raspberrypi/linux/issues/534
of course you could simply copy comedi back into the kernel and that
should work.

My students tried to re-enable it recently and gave up but they are no
kernel programmers.

If there is interest I can write a generic "how to" how to patch comedi
back into the RPI kernel.

The USB-DUX-sigma is no longer on sale but I have a few (without box)
still about. You can buy them for £100+shipping. Please DM via bernd@ >>
Bernd Porr <be...@glasgowneuro.com>.

/Bernd

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[Bernd Porr]

PS: the Sigma is open source and open hardware now. You can also send
the design files to any prototyping service.
https://github.com/glasgowneuro/usbdux/tree/main/usbdux-sigma Of course
if there is larger interest I'd be happy to make a batch of them and/or
help!

[Thomas Schmidt]

PS: The

attys-scope

can i.e. geophones (voltage output) be attached?

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[Thomas Schmidt]

God morning Bernd,

Thanks for your kind offer. I would like to buy two boxes. Please send me how this can be done.

Thank you,

Thomas

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[Bernd Porr]

Hi all,

I've extracted the comedi drivers from the vanilla LTS kernel from
kernel.org and hacked the makefiles so that it can be compiled outwidth
the kernel and then installed:

https://github.com/glasgowneuro/comedi_raspberry_pi_bullseye

It compiles the USB drivers and installs them as modules.

I've done only a quick check so far but seem to work. Anybody out there
with an RPI can try as well.

/Bernd

On 07/03/2023 10:52, Bernd Porr wrote:

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[Thomas Schmidt]

Hi Bernd,

THANK YOU for this "how too".

I installed everything accordingly but have no device that I could use for testing the comedi drivers.

Have a good weekend,

Thomas

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[Thomas Schmidt]

Hi all,

tryed the procedure Bernd proposed on a rockpi4c+ with armbian and ended up with

usb 4-1: new high-speed USB device number 2 using ehci-platform
[  301.651818] usb 4-1: New USB device found, idVendor=13d8, idProduct=0020, bcdDevice= 0.00
[  301.651863] usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[  301.712173] comedi: loading out-of-tree module taints kernel.
[  301.712890] comedi: module verification failed: signature and/or required key missing - tainting kernel
[  301.715097] comedi: version 0.7.76 - http://www.comedi.org
[  301.726392] usb 4-1: Direct firmware load for usbduxsigma_firmware.bin failed with error -2
[  301.726425] usbduxsigma 4-1:1.0: driver 'usbduxsigma' failed to auto-configure device.
[  301.726916] usbduxsigma: probe of 4-1:1.0 failed with error -2
[  301.727011] usbcore: registered new interface driver usbduxsigma

any suggestion what I did wrong?

Thanks,#

Thomas

[Bernd Porr]

Hi,

looks like the firmware file couldn't be found. Should be in /lib/firmware.

On an original RPI4 actually the whole usb driver hangs and then even the keyboard won't work any longer. Hopefully it works better on the rockpi4c. Def works on a RPI3 but that has a different USB controller (= 2.0).

Best,

/Bernd

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[Bernd Porr]

If it just needs the firmware then copy the file into /lib/firmware and it should be fine. Firmware attached.

/Bernd

On 08/05/2023 11:38, Thomas Schmidt wrote:

Hi,

this was under rockpi4plus with ubuntu. Here sudo apt install firmware-linux-free doesn't work

under /lib/firmware I could not find the usbdux firmware

tried therefore the procedure under rockpi4plus current bullseye 5.15.93 and end up with this

root@rockpi-4croot@rockpi-4cplus:/home/ts/usbdux/comedi_raspberry_pi_bullseye# make -C /usr/src/linux-headers-5.15.93-rockchip64
make: Verzeichnis „/usr/src/linux-headers-5.15.93-rockchip64“ wird betreten
  UPD     include/config/kernel.release
  UPD     include/generated/utsrelease.h
make[1]: *** Keine Regel vorhanden, um das Ziel „arch/arm64/tools/gen-cpucaps.awk“,
  benötigt von „arch/arm64/include/generated/asm/cpucaps.h“, zu erstellen.  Schluss.
make: *** [arch/arm64/Makefile:173: archprepare] Fehler 2
make: Verzeichnis „/usr/src/linux-headers-5.15.93-rockchip64“ wird verlassen
plus:/home/ts/usbdux/comedi_raspberry_pi_bullseye# make -C /usr/src/linux-headers-5.15.93-rockchip64
make: Verzeichnis „/usr/src/linux-headers-5.15.93-rockchip64“ wird betreten
  UPD     include/config/kernel.release
  UPD     include/generated/utsrelease.h
make[1]: *** Keine Regel vorhanden, um das Ziel „arch/arm64/tools/gen-cpucaps.awk“,
  benötigt von „arch/arm64/include/generated/asm/cpucaps.h“, zu erstellen.  Schluss.
make: *** [arch/arm64/Makefile:173: archprepare] Fehler 2
make: Verzeichnis „/usr/src/linux-headers-5.15.93-rockchip64“ wird verlassen

any suggestion what I can do?

BEST

Thomas

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[Thomas Schmidt]

Hi,

thanks for the firmware. I am going to try it.

Rockpi4cplut + bullseye 5.15.93-Rockchip64 headers installed ... ends up as the RPI4 -> even keyboard doesn't work anymore .-( furstration.

Best,

Thomas

[Thomas Schmidt]

Hi All,

Tryed usbduxsigam_firmware.bin -> that did it on rockpi4c+ with ubuntu 23.02.2 aarch64 with

procedure according to:  https://github.com/glasgowneuro/comedi_raspberry_pi_bullseye.

Could compile and execute comedirecord!! THANKE YOU Bernd!!

PS: comedirecord needs qtbase5-dev+qt5make!

Bernd Porr schrieb am Montag, 8. Mai 2023 um 12:49:08 UTC+2:

[Bernd Porr]

That's excellent news. Great to know it works with the rockpi4c.

Best,

/Bernd

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[Thomas Schmidt]

Hi All,

procedure according to:  https://github.com/glasgowneuro/comedi_raspberry_pi_bullseye.

works on rpi2b current version 6.1.21-v7+

works on rpi3b current version 6.1.21-v7+

doesn't work on rpi4b current verson 6.1.21-v7+

Kind Regards,

Thomas