Staff Assigned: Adam Robichaud AC4040 Connection issues on Linux (DLAPI V4.2.7-0)

Hi Padraig,

Can you tell me what exactly isn't working for you?

Cheers,
-Adam

 

So there are a few easy reasons this could happen:
1. libftd3xx.so isn't installed on your system (check /usr/local/lib)
2. the camera isn't accessible from your user account (try your application with sudo; if it works, it's a permissions issue)

If neither of those things yields fruit, we'll have to check other things like USB buffer sizes, USBPCap logs, and the like.

 

These are more involved. Would it be possible for me to log in via a remote support tool and do some troubleshooting/collect a baseline?

 

Just chiming in here, the usual way to check USB buffer capacity goes something like this:

To increase the amount of USB buffer space to a more appropriate value (in this case, 1GB), do the following:
Solution for systems using GRUB based bootloader (such as Ubuntu running on a PC):
1. Edit the file ‘/etc/default/grub’ and look for the line ‘GRUB_CMDLINE_LINUX_DEFAULT=”{some_text}”
2. Append ”usbcore.usbfs_memory_mb=1000” to the end of some_text. For example:
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash”
becomes
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash usbcore.usbfs_memory_mb=1000”
3. Effect this change with the following command:
sudo update-grub
4. Manually set the memory limit (to 1GB) by entering the command:
‘sudo modprobe usbcore usbfs_memory_mb=1000’
5. Reboot your system for this change to take effect.

 

The usual system default value of usbfs_memory_mb will be 16MB, which is less than half the amount required.
You need at the very least 34MB for a single image from the camera, or it will fail.

1GB is an "overkill" starting point - it depends on what all is attached to your system, and it is a maximum size.

Then you need buffers for any other USB devices that can be running concurrently.
So reasonably you might want to have 70 MB to 200MB or more.

 

Padraig,
Quick questions (Adam is tied up at the moment):

1. Can you tell me who you work for/is this a University/College?

2. What's the camera serial number? It's on the label on the side.

3. Are you sure you have the correct SDK version?
e.g. Why does your path have an old version of the SDK ?
padraig@computer:~/Downloads/dlapi-2.4.5.0-x86_64.linux/redist/sample$
instead of something like:
dlapi-sdk-4.2.7-0-x64-Ubuntu-24.04

Are you trying to use an obsolete SDK?
A much more recent version is here:
https://cdn.diffractionlimited.com/dlapi/

4. Does the camera connect in Windows with DL Config x64 or MaxIm DL 7.3.0?

5. Is the firmware in the camera updated?

Am just thinking about other likely reasons for trouble, as this is usually quick to sort out.

 

Hi Padraig,
I'm going to test the latest Linux SDK (4.3.2.1) on a freshly installed Ubuntu 24.04 LTS machine with one of our USB 3.0 cameras and see if I can give you any insight.

 

Hi Padraig, am still working through this. I've managed to get a clean machine to the same point where a USB 3.0 camera is showing in lsusb, but not seen by the sample programs. Will let you know of further progress when I have more to report.