Hi developers,

I'd like to access the parallel port from an external. The problem is the speed: I need more than 1000 (in words: one thousand) accesses per second. I've tried using the IRQ and a callback function but Windows seems to have limitations that result in a maximum callback interval of 1 millisecond. That's still to slow for my purposes. Another idea was to put the hardware acces into the dsp routine and read out the bytes from the parport every - say - 16 samples. But this won't give a periodic access because the execution time of the dsp loop depends on processing time and as long as my external doesn't do any other audio stuff it executes much to fast.

Does anybody know how to get access to the IRQs on Win faster than every millisecond? Or is there a way to send a child thread to sleep for a period shorter than 1 millisecond (it appears to me that 1 millisecond is the shortest time interval Win can handle).... ?

thanks a lot, Olaf