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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cyclades-devices

cyclades-devices(5)													       cyclades-devices(5)

NAME

       cyclades-devices - tables for driving cyclades-serial-client

DESCRIPTION

       The  cyclades-devices  file  supplies all mapping between Unix device files (/dev/*) and the addresses of serial ports of Cyclades Terminal
       Servers. It contains one entry for each serial port, with the following format:

       device:rastype:rasname:physport:type:options

       Note: A # character at beginning of line indicates a comment

       The entry fields are:

       devname
	      - A full pathname of the file that will be associated to the serial port. It must start with  a "/dev/" preffix.	Two naming schemes
	      may  be  used here: - devname does not exist, and will be linked to a free pseudo-tty. This is the default behavior of cyclades-ser-
	      cli.  - devname is the name of a valid slave pseudo-tty.	In this case, the '-t 1' option must be assigned in options field.  (Note:
	      this option is not supported by this release).

       rastype
	      - Terminal Server type: - prts, for Cyclades Pr302X/TS Terminal Servers.	- path, for Cyclades PathRAS Terminal Server.

       rasname
	      - Host Name or IP Address of the Terminal Server where the serial port resides.

       physport
	      -  Number  of physical port in the Terminal Server. If treated as the IP address associated with this port, in a IP-based addressing
	      scheme.

       type   - Server type that will be contacted to handle the serial port: - rtelnet, for Remote Telnet Server - socket, for Socket Server

       options
	      - Per-port specific options, passed to cyclades-ser-cli program.

EXAMPLES

       1. Device on a PR3020/TS Terminal Server pr3k Port 1, accessed through /dev/ctty01 device file name, using telnet protocol  (remote  telnet
       server)

       /dev/ctty01:prts:pr3k:1:rtelnet:

       2. The same device, but with an IP address pr3k_port1 associated to the serial port (IP-based port addressing)

       /dev/ctty01:prts:pr3k_port1:0:rtelnet:

       3. Device on a PathRAS Terminal Server pr3k Port 2, accessed through /dev/ctty02 device file name, using socket protocol (socket server)

       /dev/ctty02:path:pr3k:2:socket:

FILES

       /etc/cyclades-devices	This file

SEE ALSO

       cyclades-serial-client(1), cyclades-ser-cli(1)

															       cyclades-devices(5)

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