[fpc-pascal] USB Human Interface Devices

[James Richters]

Yes, and besides the errors, everything else seems to work properly.   I did notice that the one machine uses an AMD processor and all the others are Intel,  not sure what that would have to do with anything, but it is a major system configuration difference.

 

Thanks for the debug level information.  I will probably just shut off all messages but it would be nice to have a way to turn them on if I need to debug something on a remote system.  

 

How about the libusbxhid debug messages?   Since they are controlled with {$ifdef DEBUG_MSG} you can’t really turn them on and off without re-compiling.  Could another variable be used to make libusbxhid messages optional but only if {$ifdef DEBUG_MSG} is used?   It would be helpful to be able to hide them most of the time but show them if trying to debug without re-compiling.

 

James

 

From: fpc-pascal <fpc-pascal-bounces at lists.freepascal.org> On Behalf Of Stefan V. Pantazi
Sent: Thursday, August 29, 2019 1:11 PM
To: FPC-Pascal users discussions <fpc-pascal at lists.freepascal.org>
Subject: Re: [fpc-pascal] USB Human Interface Devices

 

I would chalk this up to differences between OS versions, configurations, devices, etc and move on. I see all memory is released. At  least it does not crash and burn badly. 

 

The function call you want to play with is:

libusb_set_debug

http://libusb.sourceforge.net/api-1.0/group__lib.html#ga5f8376b7a863a5a8d5b8824feb8a427a

 

Of course, you can set the level dynamically, from your program.

 

 

 

On Thu, Aug 29, 2019 at 12:34 PM James Richters <james at productionautomation.net <mailto:james at productionautomation.net> > wrote:

At least I can shut off the messages with that.. but any idea what these messages actually mean?   It’s an init_device error but no one was tying to do anything but get the list of devices from the system.

 

Is there a description of the verbosity level anywhere?

 

Is this a variable I can change during program execution without re-compiling it?  It would be helpful if I was having an issue to turn on debug info, then turn it back off without exiting my program or needing to compile.

 

James

 

 

>libusb has a debug verbosity level which currently is set to 3 (i.e., very verbose) in the device open function.

>There is a define in libusbx.pas that you can change to shut off debug messages.

_______________________________________________
fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org <mailto:fpc-pascal at lists.freepascal.org> 
https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freepascal.org/pipermail/fpc-pascal/attachments/20190829/d0243588/attachment-0001.html>