Search found 23 matches

by brad
Mon Jun 06, 2011 6:45 pm
Forum: SUB-20 General Discussion
Topic: Open Drain GPIO ?
Replies: 6
Views: 17094

Re: Open Drain GPIO ?

I'll look into using the 8-bit PWM for my application.
Can you provide me the example external-transistor circuit you offered?
Thanks.
by brad
Tue May 31, 2011 9:39 pm
Forum: SUB-20 General Discussion
Topic: Open Drain GPIO ?
Replies: 6
Views: 17094

Re: Open Drain GPIO ?

Thanks for the reply. Unfortunately I wasn't specific enough in my original post. I would like the "fPWM" module to be open-collector... this is SPI pin #4. I could also use the 8-bit PWM module but not as desirable. I am trying to pull down a 6.5V high-impedance load with the PWM signal. When PWM D...
by brad
Tue May 31, 2011 8:31 pm
Forum: SUB-20 General Discussion
Topic: Open Drain GPIO ?
Replies: 6
Views: 17094

Re: Open Drain GPIO ?

I looked in the manual for the Atmel processor on my sub20.... looks like the GPIO can have its internal pullup resistor disabled.
by brad
Tue May 31, 2011 8:13 pm
Forum: SUB-20 General Discussion
Topic: Open Drain GPIO ?
Replies: 6
Views: 17094

Open Drain GPIO ?

Hi,
Can the Sub20 devices be configured to operate in open collector configuration? ie if output is disabled (low), then pin has high impedance.

Thanks,
Brad
by brad
Tue Mar 15, 2011 12:09 am
Forum: SUB-20 General Discussion
Topic: labview references
Replies: 9
Views: 20897

Re: labview references

I removed the previous sub20 installation using the installer tool, installed SUB-20-101021. At this point LV 8.2.1 had no problem with the sub20dnc.dll. I copied in the DLL posted in this thread and the error occured.

-brad
by brad
Mon Mar 14, 2011 10:05 pm
Forum: SUB-20 General Discussion
Topic: .NET dll memory leak ??
Replies: 5
Views: 12557

Re: .NET dll memory leak ??

Thanks for checking. I will see if the problem reproduces with 8.2.1.

-brad
by brad
Mon Mar 14, 2011 10:04 pm
Forum: SUB-20 General Discussion
Topic: labview references
Replies: 9
Views: 20897

Re: labview references

When I try to add the assembly reference to LV 7.1.1f2, 8.0, or 8.2.1 I get an error. LV either crashes or says that the file may not be a .NET assembly. Specifically in LV 8.2.1: Add .NET constructor browse to the x32 version of the 1.4.6 file The objects box says: "An error occured trying to load ...
by brad
Mon Mar 14, 2011 8:21 pm
Forum: SUB-20 General Discussion
Topic: labview references
Replies: 9
Views: 20897

Re: labview references

Is this built for .NET 3.5 or .NET 4.0 ? Does it matter?
by brad
Wed Mar 09, 2011 6:05 pm
Forum: SUB-20 General Discussion
Topic: labview references
Replies: 9
Views: 20897

Re: labview references

Serg, In most cases, Labview automatically deletes .NET references when the top-level application stops running. I have tried to store the .NET reference in a global variable but once the top-level app stops running the reference is no longer valid (sub20 device doesn't respond). The only labview wo...
by brad
Tue Mar 08, 2011 5:37 pm
Forum: SUB-20 General Discussion
Topic: .NET dll memory leak ??
Replies: 5
Views: 12557

Re: .NET dll memory leak ??

Thank you.