get_serial() not returning when running from Rapbery pi

[MartijnBroens]

Hi,

I have a raspberry pi Linux mypi 4.19.75-v7l+ #1270 SMP Tue Sep 24 18:51:41 BST 2019 armv7l GNU/Linux which i would like to controll a miniciruits attenuator using pyminicircuits. i have this working in python3 on a PC and i have this working on a ubuntu environment but the raspberry is either reporting :

Python 3.7.3 (default, Apr  3 2019, 05:39:12)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pyminicircuits import Attenuator
>>>
>>> a = Attenuator()
Failed to open device. You may need to follow these steps:

Install dependencies:

    $ sudo apt install libudev-dev
    $ pip install hidapi

Create a new file /etc/udev/rules.d/85-minicircuits.rules with:

    ATTR{idVendor}=="20ce", MODE="660", GROUP="plugdev"

This will tell udev to allow members of the plugdev group to access all
Mini-Circuits USB devices.

Ensure that your user is a member of the plugdev group:

    $ sudo usermod -a -G plugdev <username>

Reload the udev rules:

    $ sudo udevadm control --reload-rules
    $ sudo udevadm trigger

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pi/.local/lib/python3.7/site-packages/pyminicircuits/__init__.py", line 38, in __init__
    self.h.open(vid, pid)
  File "hid.pyx", line 66, in hid.device.open
OSError: open failed

or not returning from any of the sub functions like get_serial()

I have done the steps mentioned but i always get these results do you have any tips for me? id like to use this on my target

Br Martijn

[storborg]

Can you have a look at dmesg and see if you see any output related to the attenuator USB device? This may the biggest indicator of some kind of USB error.

Also, which attenuator model are you using? Particularly, is it one of the USB-only models or USB+ethernet?

[MartijnBroens]

Hi Scott, Thanks for the reply. I’m using the RCDAT-6000-90 over USB never tried Ethernet on this device. Its connected to a raspberry pi 3 and I’m logged in as normal pi user. As mentioned I have multiple of these and use them with your code on multiple platforms therefore I know it works, just not on the raspberry pi which is the only one in this combination. Below is a logging from putty with all but dmesg does not show anything once it goes wrong. Note that I cleared dmesg before starting the test. Also notice that trying a second time I get the error shown below. pi@mBedit-ITS100:~ $ python3 Python 3.7.3 (default, Apr 3 2019, 05:39:12) [GCC 8.2.0] on linux Type "help", "copyright", "credits" or "license" for more information.

>> from pyminicircuits import Attenuator >> a = Attenuator() >> print(a.get_serial())

^CTraceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/pi/.local/lib/python3.7/site-packages/pyminicircuits/__init__.py", line 147, in get_serial d = self._cmd(self.CMD_GET_SERIAL_NUMBER) File "/home/pi/.local/lib/python3.7/site-packages/pyminicircuits/__init__.py", line 60, in _cmd d = self.h.read(64) KeyboardInterrupt

>>

[1]+ Stopped python3 pi@mBedit-ITS100:~ $ whoami pi pi@mBedit-ITS100:~ $ uname -a Linux mBedit-ITS100 4.19.75-v7l+ #1270 SMP Tue Sep 24 18:51:41 BST 2019 armv7l GNU/Linux pi@mBedit-ITS100:~ $ sudo dmesg pi@mBedit-ITS100:~ $ pi@mBedit-ITS100:~ $ pi@mBedit-ITS100:~ $ python3 Python 3.7.3 (default, Apr 3 2019, 05:39:12) [GCC 8.2.0] on linux Type "help", "copyright", "credits" or "license" for more information.

>> from pyminicircuits import Attenuator >> >> a = Attenuator()

Failed to open device. You may need to follow these steps: Install dependencies: $ sudo apt install libudev-dev $ pip install hidapi Create a new file /etc/udev/rules.d/85-minicircuits.rules with: ATTR{idVendor}=="20ce", MODE="660", GROUP="plugdev" This will tell udev to allow members of the plugdev group to access all Mini-Circuits USB devices. Ensure that your user is a member of the plugdev group: $ sudo usermod -a -G plugdev <username> Reload the udev rules: $ sudo udevadm control --reload-rules $ sudo udevadm trigger Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/pi/.local/lib/python3.7/site-packages/pyminicircuits/__init__.py", line 38, in __init__ self.h.open(vid, pid) File "hid.pyx", line 66, in hid.device.open OSError: open failed

>>

Hope this helps Met vriendelijke groet/ With kind regards, Martijn Broens From: Scott Torborg <notifications@github.com> Sent: Wednesday, July 22, 2020 6:59 AM To: storborg/pyminicircuits <pyminicircuits@noreply.github.com> Cc: Martijn Broens <martijn@mbedit.nl>; Author <author@noreply.github.com> Subject: Re: [storborg/pyminicircuits] get_serial() not returning when running from Rapbery pi (#3) Can you have a look at dmesg and see if you see any output related to the attenuator USB device? This may the biggest indicator of some kind of USB error. Also, which attenuator model are you using? Particularly, is it one of the USB-only models or USB+ethernet? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<#3 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AGKAUBX7YYJCGKFASLNPPSTR4ZW2TANCNFSM4PDULPSQ>.

[MartijnBroens]

Hi Scot,

do you have any update on this topic? anything else you would want me to try??

Br Martijn

[storborg]

Hi, sorry, I've been meaning to try to grab an RCDAT and a Pi and try this but haven't gotten it yet.

My guess is that this is related to the usbhid support on that kernel build, or the USB permissions. Some things you could try:

• Does a normal keyboard (or other usbhid device) work?
• Can you try running Python as root (to see if it's a permissions issue)?

Also, I'm not quite sure from your message: when you cleared dmesg and then ran the test, did you plug in the device after clearing dmesg? If not, can you try that, and post the dmesg output you get when plugging in the device?