Fast timing and serial port ?

From: Charles Sullivan (cwsulliv_at_triad.rr.com)
Date: 11/13/05 

Date: Sun, 13 Nov 2005 16:30:18 GMT

I have an app which controls an external device via an RS232
serial port and standard port driver.

To actuate one feature in the app I need a timer in the 500-1000
microsecond range, however the basic timing resolution available
with nanosleep() under Linux is 10 milliseconds for a user
program. (I understand that setting a real-time scheduling
policy can provide finer resolution, but that it would require
running the app with root privileges.)

A serial port has it's own internal clock and I was wondering
if there is any way of accessing this through the standard
driver ioctl() to provide a timer with the required resolution?

Any thoughts will be appreciated.

Regards,
Charles Sullivan
 

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