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Did you turn off the input-FiFo??
This FiFo catches incomming characters
till:
- the FiFo is more or less full,
- the input timed out
This could describe what you see.
Jens Michaelsen
----- Original Message -----
Sent: Friday, March 09, 2001 10:09
AM
Subject: [rtl] rt_com speed
problems
Hi,
I have been trying to do some 2 way communication
using the serial port,
and although I can get communications to run a lot
faster than they did
under linux, there still seems to be a limit as to how
fast I can switch
between read and write using rt_com. Under linux the
latency was about
10ms, so I could only communicate at about 50Hz (send,
10ms switch,
receive, 10ms switch, ignoring the time for signal), using
rt_com, I don't
seem to be able to beat 1kHz (thus about .5ms for switch
and send, .5ms
switch and receive, making a bit over .25ms
latency).
Is this normal? I would like to be able to communicate up to
2kHz ideally,
as this is closer to the theoretical baud rate limit (115200
baud) given
the amount of data I'm transmitting (1 byte send, 4 receive),
but I
haven't been able to speed it up, despite playing around with the
rt_com
code itself. Does anyone have any
ideas?
Cheers,
Richard Reeve
University of
Stirling
Stirling
UK
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