Programming serial port Post: 302269118

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Top Forums Programming Programming serial port Post 302269118 by WebKruncher on Wednesday 17th of December 2008 12:15:08 AM

12-17-2008

Registered User

C++

The Michael R Sweet reference looks really good - I'll keep this handy. But, it shows only the C interface. The samples demonstrate the critical components, and understanding it is a necessary first step before building your object oriented design.

If your target supports standard exception handling, you can take advantage of C++ streams. Here is an example http://www.webkruncher.com/speedstreams.h that demonstrates using C++ iostreams for a local file. I've used the same method to interface with serial ports and sockets. It can be adapted to virtually any IO. Even if your IO needs to be fully optimized, you can still take advantage of the OO structure.

The goal is really to have one, straight forward C++ header file that defines and fully implements everything needed to communicate with your target port. Then, your protocol manager sees your target device as if it were a simple file. So, when you initialize the system that interfaces with your target device, the source code could look something like this....

SerialStream io("COM1");
while(!io.eof())
{
string line;
getline(io,line);
}

io<<"hello"<<endl;

Then you build an object to manage the negotiations required by your protocol and put it to use.

Hope that helps.
-Jmt

WebKruncher

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sredird

sredird(8)							      sredird								sredird(8)

NAME

       sredird - RFC 2217 serial port server

SYNOPSIS

       sredird [-i] log-level serial-device lock-file [poll-interval]

DESCRIPTION

       This manual page documents briefly the sredird, program.

       This  program  when  run  through inetd will use the RFC 2217 extensions to TELNET to implement serial commands over the TCP connection and
       interface to a specified serial port.

OPTIONS

       An optional first parameter is '-i' to enable compatability with Cisco IOS.

       The first mandatory parameter is the log level for use in syslog.  The next mandatory parameter is the device node for the  serial  device,
       it  must  be  a	fully  qualified  path.   The  final mandatory parameter is the file name for the lock file to be used to prevent multiple
       instances of sredird from talking to the serial port at the same time, or to allow sharing a port between modem and sredird.

EXAMPLE

       Here is a configuration line for running it from inetd: sredir	       stream  tcp     nowait  root    /usr/sbin/tcpd /usr/sbin/sredird  5
       /dev/modem /var/lock/LCK..modem

AUTHOR

       This  man page was written by Russell Coker <russell@coker.com.au>.  May be freely used and distributed without restriction under the terms
       of the GPL.

       The sredird program was written by Denis Sbragion <d.sbragion@infotecna.it> and Jeffrey Altman <jaltman@columbia.edu>.

Russell Coker <;russell@coker.com.au>				       2.2.0								sredird(8)

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