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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LEARN ABOUT OSF1

iscc

iscc(7) 						 Miscellaneous Information Manual						   iscc(7)

NAME

       iscc - serial communications interface

SYNOPSIS

       controller  iscc0  at  isa0

DESCRIPTION

       An  onboard  Zilog  8530  DUART	provides  AXPvme-based Single Board Computers with console (CON) and auxiliary (AUX) serial communications
       ports.  Both serial communications ports can operate at baud rates from B50 to B38400,  excluding B134 (see tty(7)).

       On AXPvme Single Board Computers configured with a graphics head as the system console, the CON serial communications port (/dev/tty01)	is
       available for use by application programs as an additional communications port.

       In  the	absence  of a graphics head, the CON serial communications port (/dev/console) becomes the system console. When used as the serial
       system console, the CON serial communications port always operates at 9600 BPS, 8-bits, and no parity.

       Regardless of system console, the AUX serial communications port (/dev/tty00) is always available for use by application programs.

RESTRICTIONS

       Data communications equipment attached to the CON serial communications port must be set to 9600 BPS, 8-bits, no parity when configured	as
       the serial system console. The iscc terminal driver enforces this restriction.

       No modem control is supported for either the CON or AUX serial communications ports.

FILES

       console terminal local terminal local terminal

RELATED INFORMATION

       console(7), devio(7), tty(7), MAKEDEV(8) delim off

																	   iscc(7)

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