Problem solved !
The main problem was that I didn't know that the equipment used
DTR as character acknowledge (not RTS/CTS which is common for flow
control). I didn't even bother to look at those lines with the
oscilloscope. Now the software runs fine with negligible latency.
Now the total latency is so low that the low_latency option to
setserial really matters, it reduces the total run time of my
program with 38 %
I don't get any measurable speed improvement by forcing the UART
to be detected as a 8250 or a 16450 though.
I have not tested with HZ=1000.
All in all, my problem is solved, thank you all.
Geir
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This archive was generated by hypermail 2b29 : Fri Mar 23 2001 - 21:00:20 EST