[EMAIL PROTECTED] (Hal Murray) writes:
>>>You also get jitter from the OS (and serial port hardware). >>>There should be a simple recipe to minimize that. I haven't >>>seen one and several tries haven't produced anything that >>>I'd call good-enough. (When I run out of other things to >>>work on...) >>What is good enough? >Something I can easily measure. Well, apparently you can measure it-- "You also get jitter from the OS..." suggests that you measured something. But that is not good enough. The serial port I seem to recall has a worse behaviour of the interrupt than does the parallel port. But what you can do is a loopback-- put some output onto one of the output pins of the serial port which loops back into the interrupt port. timestamp the raising of the pin on the output and timestamp the interrupt and see by how much they differ. That of course measures only the total out-in time but it is an indication of how the serial interrupt works. do the same for the parallel port. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
