mcnitt@buster.cps.msu.edu (Kevin L McNitt) (05/14/91)
Hi,
I have a problem that I hope someone out there can help me with,
I am trying to capture thru a serial port a block of 1024 characters
sent from another computer, the other computer does no handshaking of
any kind, it Sends 1024 char. and waits for an 0x006 (ack) then it sends 1024
more characters.
The system I am using is pretty much a standard system 5 r3v6
currently: tying to use the \dev\tty thru open with read & write
set termio.c_lflag to 0
then read (input,buffer location,1024-number already read)
Problem: This works sometimes for 1 or 2 blocks of 1024 better if pri.
is raised maybe 3 or 4 blocks. We seem to be droping a character
along the way.
When we do the read the driver usally only has 4 characters available on
average, so we aren't falling behind the buffer size of 256 for the driver.
Is there a better way to read from a seriel port ?
any sugestions would be greatly appreciated !
Kevin McNitt or Curtis Regentin
e-mail mcnitt@msumsf.bch.msu.edu or roo@itr1.bch.msu.edu
Mass Spec Facility
Michigan State University
rm 11 Biochemistry
East Lansing, Mi 48824masood@parc.xerox.com (Taha Masood) (05/14/91)
Hello , I am writing communication software using the serial port ttyb on a sun 4/110. I am really having a hard time trying to make my software interrupt driven; i.e whenever a message is available at the port an interrupt is generated which informs the program of the presence of data on the port.I have had success trying to make my timers in the program interrupt driven since a signal is generated each time the timer expires.No such signal seems to be generated when data is present at the port. I would really appreciate if somebody could give me valuable hints about writing such an interrupt driven software. Thanks Taha Masood e-mail: masood.wbst311@xerox.com