Hello people.

To make a debugging tool, I need to time changes on the serial port control and status lines on a Linux machine. The serial port hardware has this possibility, but is it possible to program this in a more or less high-level way? I did this a long time ago in DOS.

I've looked at several libraries, but none seem to give access to line/status change events in realtime.

Thanks in advance,
John

I doubt that you could do the same with Windows XP. Hardware operations are abstracted such that the device is "managed" via a kernel device driver. To do what you want to do might require you to write / modify the serial port driver.

Having said that, it would be doubtful as to how finite a measurement / control that you could exert over the serial port. Modern kernels are multi-tasking beasts, and by design, no one process (thread) should / could take up the full attention of the kernel for any significant amount of time. Even under an interrupt driven service there would be jitter and an unpredictable response time before the service routine is actually run.

TomW

Where can I find the rtl guide or documentation for the serial library. I'm only using linux/unix
and since I don't want to recreate the wheel sort to speak I just need details on how to use the
existing library. Couldn't find anything about it in the current 2.2.x dox. Thanks.

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