Re: [CAD_CAM_EDM_DRO] Windows timing subroutines, how do they work?

Hi Les,

Interrupt priority? That's it? But isn't it more like the highest TASK
priority? the pulse stream could still be delayed or altered if another task
was still "taking it's good sweat time", and not relinquishing control. Do you
have more detail?

Alan KM6VV


Les Newell wrote:

> Hi Jon,
>
> Art uses a low level driver that sets itself up with the highest
> interrupt priority possible. This interrupt will always be served before
> Windows gets a look in. The only thing that will pre-empt the driver is
> an in-progress DMA transfer or a cpu wait. Rtai or RTLinux have exactly
> the same priority as Art's driver though they achieve it in a different way.
>
> Les
>
> Jon Elson wrote:
>
>
>>No, not at all. He uses a DLL that runs in real mode, essentially a
>>device driver
>>kind of code. It doesn't pre-empt Windows, like the RT Linux systems
>>do, but just runs at a high priority.
>>
>>Jon