I guess my first question would be, if your talking NTSC video at
60 fields per second i.e. normal 30 frames per second video, why
are you bothering to use RTLinux in the first place, even an
old 33mhz 486 can service interrupt rates that low (and do large
amounts of processing in the interrupt service routine) without
breaking a sweat. I've done it myself some years ago with a frame
grabber I designed around the old philips SAA7195 chip set. Try
doing what you need to do in userland, just as a test, I'll bet
you'll see that 16ms is a very very long time on any newer
processor.
Loren Frank wrote:
>
> Hi all. I am new to rtlinux and I have a problem I need help with.
>
> Briefly, I need to take the bttv driver for a framegrabber card and modify it
> so that, every time an interrupt is generated, the interrupt service routine is
> serviced by the real time kernel and a timestamp is read from another card. I
> have the real time driver for the other card working, but when I tried to
> convert the interrupt service routine from the bttv-driver.c source, I just
> ended up hanging the machine. I had hoped that a simple modification where I
> changed the request_irq to a rtl_request_irq and changed the interrupt service
> routine would do it....
>
> Can anyone point me toward a solution?
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