From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page
Programming periodic interrupt generation on PCI-6601/6602
mevans
Member
03-22-2005 12:40 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Does anyone have experience or knowledge programming the the PCI-6601/6602 or similar card in Visual C++ using the NI-DAQ library to generate an interrupt at a user defined rate (eg. 60Hz) and tying a user defined ISR to that interrupt? I've been looking for sample code, and even the commands in the NI-DAQ function reference to be able to do this, but have found nothing.
Thanks,
M Evans
Thanks,
M Evans
AnujD
NI Employee (retired)
03-23-2005 06:36 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
M,
What exactly is your application? What are you trying to do?
Regards,
Anuj D.
What exactly is your application? What are you trying to do?
Regards,
Anuj D.
03-24-2005 09:27 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Anuj,
I have a vehicle driving simulation application which must me executed at a constant, steady rate, could be 60, 70, 72 Hz, depending on the hardware in the system. The update rate cannot be controlled internally by the application itself due to the limitation of millisecond resolution in Windows' callbacks, etc. So we want to use the high resolution timer on a card like this one and tie our application to an interrupt or event generated by the card.
With the millisecond resolution in Windows, the closest we can get to 60Hz is 62.5Hz (0.016 seconds per frame). With microsecond resolution we can actually get 60Hz (0.016666 seconds per frame).
I realize that we will still be at the mercy of the Windows operating system to some extent, but this solution gets us a lot closer to the steady, realtime update rate that we need.
Thanks,
M Evans
I have a vehicle driving simulation application which must me executed at a constant, steady rate, could be 60, 70, 72 Hz, depending on the hardware in the system. The update rate cannot be controlled internally by the application itself due to the limitation of millisecond resolution in Windows' callbacks, etc. So we want to use the high resolution timer on a card like this one and tie our application to an interrupt or event generated by the card.
With the millisecond resolution in Windows, the closest we can get to 60Hz is 62.5Hz (0.016 seconds per frame). With microsecond resolution we can actually get 60Hz (0.016666 seconds per frame).
I realize that we will still be at the mercy of the Windows operating system to some extent, but this solution gets us a lot closer to the steady, realtime update rate that we need.
Thanks,
M Evans
AnujD
NI Employee (retired)
03-25-2005 01:29 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
To my knowledge, you would not use the 6601/6602 to generate interrupts within a software API or the Windows OS. You can use the 6601/6602 to generate a very precise pulse train at 60 Hz. So the events generated by the card are actually voltage outputs in hardware as opposed to software events.
Can anyone else offer any more insight?
Regards,
Anuj D.
Can anyone else offer any more insight?
Regards,
Anuj D.
AnujD
NI Employee (retired)
03-25-2005 01:29 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
To my knowledge, you would not use the 6601/6602 to generate interrupts within a software API or the Windows OS. You can use the 6601/6602 to generate a very precise pulse train at 60 Hz. So the events generated by the card are actually voltage outputs in hardware as opposed to software events.
Can anyone else offer any more insight?
Regards,
Anuj D.
Can anyone else offer any more insight?
Regards,
Anuj D.
