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Serial++
Interrupt Driven Serial Ports for C++
from Cortlandt Technologies
Serial++ Version 1.0
by Cortlandt Technologies
P.O. Box 195
Pleasantville NY 10570
_______
____|__ | (R)
--| | |-------------------
| ____|__ | Association of
| | |_| Shareware
|__| o | Professionals
-----| | |---------------------
|___|___| MEMBER
This program is produced by a member of the Association of
Shareware Professionals (ASP). ASP wants to make sure that the
shareware principle works for you. If you are unable to resolve a
shareware-related problem with an ASP member by contacting the
memberdirectly, ASP may be able to help. The ASP Ombudsman can
help you resolve a dispute or problem with an ASP member, but
does not provide technical support for members' products. Please
write to the ASP Ombudsman at 545 Grover Road, Muskegon, MI 49442
or send a CompuServe message via CompuServe Mail to ASP Ombudsman
70007,3536.
Copyright Notice:
Serial++ is Copyright (c) 1991 by Cortlandt Technologies. All
rights reserved.
This manual is Copyright (c) 1991 by Cortlandt Technologies. All
rights reserved.
Warranty Disclaimer
CORTLANDT TECHNOLOGIES MAKES NO WARRANTY OF ANY KIND, EXPRESSED
OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY WARRANTIES OF
MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
CORTLANDT TECHNOLOGIES DOES NOT ASSUME ANY LIABILITY FOR THE USE
OF THIS SOFTWARE BEYOND THE ORIGINAL PURCHASE PRICE OF THIS
SOFTWARE.
IN NO EVENT WILL CORTLANDT TECHNOLOGIES BE LIABLE TO YOU FOR ANY
ADDITIONAL DAMAGES, INCLUDING ANY LOST PROFITS, LOST SAVINGS, OR
OTHER INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE
OF, OR INABILITY TO USE, THIS SOFTWARE AND ITS ACCOMPANYING
DOCUMENTATION, EVEN IF CORTLANDT TECHNOLOGIES, HAS BEEN ADVISED
OF THE POSSIBILITY OF SUCH DAMAGES.
Table of Contents
Introduction........................................4
Hardware/Software Requirements......................5
Installing Serial++.................................6
Installing .LIB Library Files.......................7
Installing .H Include Files.........................8
Using This Manual and Serial++......................10
Serial Ports...................................10
Break Trapping.................................13
Memory Models..................................13
Serial++ with Overlays.........................14
SerialPort Function Reference.......................14
constructor....................................14
destructor.....................................15
getBreakOff....................................16
getCommPort....................................17
getDataBits....................................17
getLSR.........................................18
getMSR.........................................19
getParity......................................20
getSpeed.......................................21
getStopBits....................................21
inbyte.........................................22
inmem..........................................23
instr..........................................24
isOwner........................................25
lineOK.........................................26
outbyte........................................27
outmem.........................................27
outstr.........................................28
sendBreak......................................28
setMCR.........................................29
unbyte.........................................30
constructor....................................31
destructor.....................................31
breakCt........................................32
isBreak........................................33
isCaptured.....................................34
isOwner........................................35
operator().....................................35
reset..........................................36
Serial++ is Shareware..........................38
Registration Information.......................38
Limited Distribution License...................39
Introduction
Serial++ is a library of small, safe, and efficient routines that
bring interrupt driven serial port support to your C++ programs.
It is compiled and linked with the Borland C++ compiler, and
supplied in the form of a set of ready to link object libraries.
The routines in Serial++ are as easy to use as file i/o in C, yet
give you complete access to the registers of the 8250 UART,
should you require it. They allow you to read characters from
and write characters to two serial ports simultaneously, in a
fashion very similar to stream i/o in C. Support for iostreams
as defined in C++ version 2.0 is not available as of this
release.
Implemented as C++ classes, the Serial++ library handles multiple
ports and multiple instantiations with ease. The SerialPort and
BreakTrap classes contain all the internal housekeeping necessary
to deal with multiple instances of the each class using a single
port. It is because of this feature that Serial++ lends itself
nicely to event driven applications.
Serial++ protects your applications from keyboard breaks,
(pressing the Control-Break or Control-C keys), to insure that
the necessary interrupt housekeeping is completed before
terminating,. This guarantees that premature closing of a
Serial++ application will not leave your system with invalid
service routine addresses hooked to the serial interrupts..
By default SerialPort will perform an orderly shutdown when a
break key is pressed, and exit to DOS. You can, however, specify
that keyboard breaks be handled in your own application code, in
which case SerialPort will continue to operate and ignore the
break. See the section on break trapping for details on how this
works.
You can also use the keyboard break handling in Serial++ by
itself. The BreakTrap class is entirely independent of the
SerialPort class.
Serial++ is linked into your C++ programs just like any other
library. There is absolutely no requirement for external TSR's -
- applications using Serial++ are completely self contained.
4
Hardware/Software Requirements
Serial++ may be used on any PC or PC-AT compatible computer,
running on an Intel(Tm) 8088, 8086, or 80x86 family processor or
compatible, that uses standard port addresses for COM1 and COM2.
It is worth mentioning that Serial++ assumes that your serial
port hardware makes use of the National Semiconductor 8250 UART
chip, or a clone of it. It is almost unheard of to find hardware
that uses anything else, so if you don't know what your serial
board uses, you're alright. Be aware of this issue though, if
you use some sort of exotic or proprietary serial boards in your
machine. When in doubt, try executing the demo program on your
target machine.
While Serial++ is unaffected by machine speed, and has been run
on machines operating at 4.77 to 33 MHz, it does expect to find
the serial ports and interrupt vector addresses at very specific
locations:
Device Base i/o Address Int. Vector Address
COM1: 0x03F8 0x000C
COM2 0x02F8 0x000B
Keyboard:
Ctrl-Brk n/a 0x0023
Ctrl-C n/a 0x001B
If you have difficulty getting the demo program to work, you
might want to consult the technical documentation that comes with
your computer to verify the addresses shown above.
Serial++ requires MS-DOS, version 2.11 or higher. [The library
has been tested and works with version 5.00]. Serial++ uses DOS
functions for saving, setting, and restoring interrupt service
routine addresses.
While it is running, Serial++ traps the interrupts mentioned in
the table above. Although it restores the addresses of the prior
service routines upon exit, while it is running Serial++ could
interfere with any TSR's that utilizes any of the listed
interrupts. Consult the documentation of any TSR's you use that
provide serial communications or respond to the Control-Break or
Control-C keys.
5
Installing Serial++
Serial++ is distributed as a self-extracting archive file,
SPP.EXE. The first step in installation is to copy this file
into a work directory and execute it by typing:
C:>spp
at the DOS command prompt. SPP will announce each file as it is
unpacked looking something like this:
. . .
READ.ME .
PACKING.LST .
SPPL.LIB .
BREAK.H .
SERIAL.H
SPPS.LIB .
. . .
After you have expanded SPP.EXE into its component files, you may
delete it from your install work directory, to save space.
The first file to check is READ.ME, which may contain updated
information about Serial++. You may also wish to examine the
contents of PACKING.LST, which lists every file in the package,
along with a brief description.
The files included in the Serial++ package fall into the
following groups:
> Library files, SPPx.LIB. There is one library file for each
memory model supported by Serial++.
> Include files, *.H. These are C++ source includes that
define the public interface of the classes that make up
Serial++.
> Demo related files, *.CPP, *.BAT, *.MAK, etc. These files
are included to provide you with some examples of how to
use Serial++. They include an executable demo program,
SPPDEMO.EXE, which is ready to run.
> Documentation, READ.ME, PACKING.LST, and the file that
contains this document, SPPMAN.TXT.
In order to begin using Serial++, you must place the library and
include files in a directory where the C++ compiler and linker
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