🚀 go-pugleaf

In article <1990Feb20.165257.21884@gpu.utcs.utoronto.ca> sarathy@gpu.utcs.utoronto.ca (Rajiv Sarathy) writes:
>Over the last couple of months several people have asked how to read/write
>from PC serial ports in C.  However, none of the posters summarized any
>info they received.  
>
>Since I have no record of who the posters were, and postings are cleared every
>week on this machine, I would like to either see a summary, or have someone
>help me.
>
>I need to read formatted text from the serial port.  Unfortunately, fopen
>doesn't open "com1:", so I can't see how to use fscanf.
>
>This problem has definitely been tackled several times before by users of
>digitizers, etc.  Please help!
>
>If it matters, I can use any of MSC5.1, QC2 with MASM, MASM5.1
>
>Thanks in advance.
>
>-- 
>
> Rajiv Partha Sarathy  	      _  _ /^\    INTERNET sarathy@gpu.utcs.utoronto.ca
> ................ooooooooOOOO(_)(_)\_/      BITNET sarathy@utorgpu.bitnet
> University Of Toronto Computing Services     UUCP sarathy@utgpu.uucp

  Best solution I can think of (and have used) is read the raw data into a 
buffer and use scanf(...) works just as well as fscanf(...) just takes a 
little longer.  Have you tried any of the "canned" libraries for the serial
ports??
Scott

-- 
Scott Beckstead      | Sew Crates was a grate greek.  
CIS 76106,3720       |     Dang that one got right by the spelling checker
FIDO 1:206/2814      | don't look at me YOU wrote it!

In article <1990Feb20.165257.21884@gpu.utcs.utoronto.ca> sarathy@gpu.utcs.utoronto.ca (Rajiv Sarathy) writes:
$I need to read formatted text from the serial port.  Unfortunately, fopen
$doesn't open "com1:", so I can't see how to use fscanf.

   Use stdaux ... it's already there for you.  But don't count on it working.
The serial port is not interrupt-driven by default, and has no buffering
except that provided by the chip you're using.  Writing stuff to it works
fine, but good luck trying to read from it!  I have had no luck in Turbo
Pascal or in Turbo C doing this; if you're sure you can write something
fast enough not to miss a character, you can do it all with calls to
the appropriate BIOS interrupt (14h, I think), but then the maximum speed
your program will run at depends on the power of your computer.

   Might I suggest that you look around on simtel20 for a shareware/PD
interrupt-driven comm port package?  Also check out any decent PC BBSs
in your area (Canada Remote Systems might, and I think I might have seen
such programs on the Lamis BBS at (416) 754-4103, but CRS requries
membership and Lamis also does, I think).  I found a couple of such
libraries somewhere last term, but never got around to checking them
out and I don't think I have them anymore.
-- 
Stephen M. Dunn                               cs4g6ag@maccs.dcss.mcmaster.ca
          <std_disclaimer.h> = "\nI'm only an undergraduate!!!\n";
****************************************************************************
               I Think I'm Going Bald - Caress of Steel, Rush

cs4g6ag@maccs.dcss.mcmaster.ca (Stephen M. Dunn) writes:

>In article <1990Feb20.165257.21884@gpu.utcs.utoronto.ca> sarathy@gpu.utcs.utoronto.ca (Rajiv Sarathy) writes:
>$I need to read formatted text from the serial port.  Unfortunately, fopen
>$doesn't open "com1:", so I can't see how to use fscanf.

>   Might I suggest that you look around on simtel20 for a shareware/PD
>interrupt-driven comm port package?

LiteComm is the biggest and best such library for C in the PD /
shareware area.  Available on Simtel as PD:<MSDOS.C>MCOMM.ARC
(microsoft C version), and PD:<MSDOS.TURBOC>TCOMM.ARC (turbo C
version).

--Richard

-- 
Richard J. Reiner              rreiner@nexus.yorku.ca
BITNET: rreiner@yorkvm1.bitnet (also rreiner@vm1.yorku.ca)