Bart
You cannot measure an event to a precision of even 1 microsecond
using a parallel port on a PC running real time Linux. The hardware-related
jitter will be at least an order of magnitude higher than this. If you are
really looking for nanosecond precision, you can resolve around 10 ns
using a PLD-based peripheral like the one I'm developing.
John
On Mon, 10 Apr 2000, Bart Vandewoestyne wrote:
> I am an electronical engineering student, and for my thesis I think of
> using RTLinux 2.0. My problem is the following:
>
> I have a certain pulse that is being attached to the parallel port. The
> lenght of the pulse is +/- 100ms
> I want to be able to get a value that is representing the length
> (duration in time) of the pulse, and it has to be quite accurate, let's
> say i have to be able to measure with an accuracy of 0.001 micro sec.
> To solve this, already lots of people have pointed me to RTLinux, and
> today, I downloaded RTLinux 2.0 and got to install it on my system:
--
John Storrs, Laboratory for Micro Enterprise
125 Culham 1 Site, Culham, Abingdon OX14 3DA, UK
tel/fax 01865 407085 email [EMAIL PROTECTED]
www http://www.i-way.co.uk/~storrs
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