Re: USBTMC Device can not autoConnect

[Eric Norum via Tech-talk <tech-talk@aps.anl.gov>]

On Jul 17, 2019, at 11:00 AM, Christopher Herrmann <ch852@cornell.edu> wrote:

Both systems have the same version of EPICS retrieved from github. I also believe that both systems have the same version of ASYN.

Is the version number listed somewhere in the module so that I can double check?

Check your application configure/RELEASE file.

Here for example are the salient lines from a test IOC here:

ASYN       = /eda/epics/R3.15.5/modules/soft/asyn/asyn4-31

AUTOSAVE   = /eda/epics/R3.15.5/modules/soft/autosave/autosave-5-1

IOCEXIT    = /eda/epics/R3.15.5/modules/soft/iocExit/iocExit-2-0

EPICS_BASE = /eda/epics/R3.15.5/base

I can't remember if I got them from the module github

page or if I pulled them out of synApps and compiled them. Is there a preferred method?

The libusb question gets a bit interesting. The first system was debian based and so I installed libusb-1.0 via apt. 

Running dpkg --get-selections | grep libusb gives me this output on the debian system.

libhidapi-libusb0:amd64 install
libusb-0.1-4:amd64 install
libusb-1.0-0:amd64 install
libusb-1.0-0:i386 install
libusb-1.0-0-dev:amd64 install
libusb-1.0-doc install
libusb-dev install
libusbmuxd4:amd64 install

When I was compiling asyn for the Scientific Linux system it kept complaining that <libusb/libusb-1.0.h> was not found.

I had someone install what I thought was the correct package, but still got the same error when compiling.

Someone else then mentioned something about libusb vs libusbx. Here is the output from running rpm -qa | grep libusb

on the Scientific Linux system:

libusbx-devel-1.0.21-1.el7.x86_64
libusbmuxd-1.0.10-5.el7.x86_64
libusb-0.1.4-3.el7.x86_64
libusb-devel-0.1.4-3.el7.x86_64
libusbx-1.0.21-1.el7.x86_64

Could that have something to do with it?

I’ve not used libusbx and it sounds like it really isn’t the right package to use.

From the libusb wiki:

libusb.org, libusbx.org and libusb.info

libusb.org was the original home for libusb project. Now it still exists but the information and code are quite outdated.

libusb.info is the current home page for libusb project.

libusbx was a fork of libusb and libusbx.org is its website. As of 2014.01.26, libusbx project has been fully merged back into libusb and is being discontinued. libusbx.org is no longer related to libusb project.

-- 

Eric Norum
wenorum@lbl.gov