cport

The CPORT minitoolbox supplies basic functions to open, configure, read from,etc to ports.

Description

The CPORT minitoolbox supplies basic functions to open, configure, read from and write to serial and parallel ports under microsoft Windows 95/98 and (maybe) NT. The toolbox is implemented using a series of MEX files and M files. Requires Windows95/98/NT and Matlab 5.x
 
Included functions:
-------------------
     cportopen - opens a serial or parallel port for use.
     cportconfig - returns/modifies the configuration of a port.
     cportwrite - writes characters to a port.
     cportgetchar - reads characters from a port.
     cportgetline - reads an entire character line from a port.
     cportreset - resets a port, retrieves error codes and strings
                    and flushes its buffers.
     cportclose - closes an open port.
 
 
Tested on Windows 95 under MATLAB 5.2

• Required Products: Instrument Control Toolbox
• MATLAB release: MATLAB 5.2 (R10)

[Matias Bustos Santa Maria]

This is just what i was looking for.

[Amin Habaibeh]

I have tested the program. However, I have discovered when reading from RS232 that a 0x00 byte will be ignored when reading the data !

[bao pinglei]

i find that i cannot read and write 'lpt1'
what is the wrong ??

[eng md]

could you plz give example code lines in order to use the cportopen function to write to parallel port.

[Stepan Sutula]

 

[wang guodong]

 

[James Hough]

Does it have a function for determining the number of bytes in the buffers

[Tjhang Suwandi]

I already use this function, but i still can't write to lpt1. Is there a bug in this function, please help? (i'm using win98)

[Stas Maximov]

Excellent tool when need to access serial port while running Matlab with -nojvm option (good idea for real-time simulation)!

As my two cents, the following patch might be in order to avoid possible garbage in input stream:

--- cportgetchar.c.00 1999-07-05 13:20:10.000000000 -0700
+++ cportgetchar.c 2004-05-13 13:19:11.000000000 -0700
@@ -63,7 +63,13 @@

 /* Create a matrix for the return arguments */

- CH_OUT = mxCreateString(ch);
+ if (ok) {
+ ch[nRead] = 0;
+ CH_OUT = mxCreateString(ch);
+ }
+ else {
+ CH_OUT = mxCreateString("");
+ }

   if (nlhs == 2) {
     STATUS = mxCreateDoubleMatrix(1, 1, mxREAL);

[Bob Brenson]

it says time to time that matlab has no more virtual memory... Any idea why?

[Rarmundo Castaño]

is well, i want to use a parallel port foy read & write for a s-function

[Wilson Nathan]

The cport routines worked fine after a few tweaks. I'm using com1 with compiled m-files on Matlab 6.5 and Windows2000.

Issues/fixes:
- The unzipped DLLs worked fine in Matlab, but I had to recompile them for the Compiler.
- Putting the toolbox on my path did not allow Matlab's path search to correctly find both the DLL and the m (help) file, unless the toolbox was my current directory. I did add %#mex to each m file (didn't help).
- I had to add: #define MAXDWORD 1.7977e+308 to several of the .c files.
- cportgetline.m required several lines to be updates :
  % if nargin<3, EOL=sprintf'\r\n'; end
  if nargin<3, EOL= '\r\n' ; end % nbw - removed redundant sprintf

  if H==0, % nbw was: rc==0, and it was after the cportconfig statement.

  % nbw adjust config for timeout to function properly
  % cportconfig(H,'ReadIntervalTimeout',-1,'ReadTotalTimeoutMultiplier',0, 'ReadTotalTimeoutConstant',0);
  cportconfig(H,'ReadIntervalTimeout',1,'ReadTotalTimeoutMultiplier',0, 'ReadTotalTimeoutConstant',1);

  % if ch==EOL(length(EOL)) % check for EOL condition
  if (ch==EOL(length(EOL))) & (length(s)>= length(EOL)) % check for EOL condition, nbw: avoid array index errors

cportgetchar works great for rx'ing 1 char at a time; when more than 1 is requested it can return junk following the valid data.

Also, I recommend using cportconfig to init each of the serial port variables as no default or auto-init is provided.

Good toolbox overall.
nbw.

[karthik rao]

HELP!!!!!

does this toolbox work for parallel port
i have a port monitor program and i tried to work with serial port using this toolbox ,and it worked fine also the portmonitor showed success
for parallel port the system was getting hung and the portmonitor program also showed an error

[umer bashir]

 

[SAMUEL DIEUDONNE YEBEL]

Hello, I need MATLAB codes for Beveridge-Nelson and any others, in order to estimate Potential output.

[Heron Molina-Lozano]

 

[Jason Lu]

Txk

[jorge cruz mancilla]

gracias

[Simon Child]

Works on Matlab 6.5, but not on Matlab 7.1

[Diego Diego]

use TMTOOL

[Jimmy]

Trying to use it in XP. But it cannot recognize any port (either com or ltp), although from the device manager I see the do work properly.

Any clues??