Newsgroups: comp.sys.mac.hypercard
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!maize.engin.umich.edu!cwalton
From: cwalton@caen.engin.umich.edu (Christopher A Walton)
Subject: faster serial port reader XFCN
Message-ID: <=27+!K#@engin.umich.edu>
Date: Fri, 31 May 91 19:27:38 GMT
Organization: University of Michigan Engineering, Ann Arbor
Distribution: comp.sys.mac.hypercard

[I am a new newsnet user and have never written an XCMD. I hope
this query is appropriate for and understandable to this newsgroup]
 
I am looking for an optimized XFCN to read individual integers from a
serial port at speeds up to (or better than) 50 integers per second.
The integers are delimited by CR and LF pairs.  I am using NeuGraph
XCMDs to plot the incoming values in realtime on a SuperCard window.

I am currently using the XFCN recvupto(delimiter,maxtime,previousdata)
from the APDA communications toolkit, but have heard (and experienced)
that it is written for generalized use and not for optimized speed.

[ recvupto(return,empty,empty) returns a <linefeed>NNNN<return> where
NNNN varies from 4 to 5 digits.  I can currently strip off the last two
characters and refer to the remaining chars as integers only about
10 times per second]

Any suggestions for faster serial port XFCN readers or pointers to code
that I could create my own XFCN from would be greatly appreciated!

Thanks
Chris Walton
cwalton@engin.umich.edu