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Full Discussion: Writing to a Serial Port
Top Forums Web Development Writing to a Serial Port Post 302923113 by Meow613 on Thursday 30th of October 2014 11:45:02 PM
Old 10-31-2014
Corona688 -

Thanks.

// These WERE saved from when minicom was running, right? - Regrettably no.

I'll make the appropriate changes in the C program when I get home [approx 8pm EST] and keep you posted.

---------- Post updated at 06:27 PM ---------- Previous update was at 12:23 PM ----------

Corona688 -

Thanks -

You can't remote into your machine? Trial-and-error with a 24 hour delay between trials...
Free standing computer at home. Can't remote into it from my other job.

Sorry

---------- Post updated at 11:45 PM ---------- Previous update was at 06:27 PM ----------

IT WORKS!!

The thing that did it, as you sugessted was to initialize the port in the program.

Here is your code, as modified -

Code:
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <stdio.h>
#include <string.h>

#define STDOUT_FILENO 1
#define BAUDRATE B9600
#define MODEMDEVICE "/dev/ttyS0"


int main(void) 
{

        const char *str="W\r\n";
        char buf[64];
        int pos=0;
        int n;
        char buff[20];
        FILE *fp1, *fp2;   
        

        fp1 = fopen(MODEMDEVICE, "w+");
        system("stty -F /dev/ttyS0 1:0:80000dad:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0");

        fp2 = fopen("testfile.txt", "w+");

        fprintf(fp1, "%s","W\r\n");
        fread(buff,7,1, fp1);
        rewind(fp2);
        fwrite(buff, 1, 7,fp2 );

}

It even works in my original program -

Code:
       #include <stdio.h>
       #include <fcntl.h>
       #include <sys/stat.h>
       #include <termios.h>
       #include <string.h>

        #define BAUDRATE B9600
        #define MODEMDEVICE "/dev/ttyS0"

        int main(void)
        {
            int n;
            char buff[20];

            FILE *fp1, *fp2;

            system("stty -F /dev/ttyS0 1:0:80000dad:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0");
 
            fp1 = fopen(MODEMDEVICE, "w+");

            if(fp1 == NULL)
            {
                printf("initiation error. \n");
                return 1;
            }

            fp2 = fopen("testfile.txt", "w+");

            fprintf(fp1, "%s","W\r\n");
            fread(buff,7,1, fp1);
            rewind(fp2);
            fwrite(buff, 1, 7,fp2 );
        }

and in the PHP script...

PHP Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<html>

    <head>
        <title>Test Scale</title>
    </head>
        <body>
        <strong>
            <div align='center'>
                  <h3>Test Scale</h3>
            </strong>
                    </div>

<?php
            error_reporting(E_ALL | E_NOTICE);
            ini_set('display_errors','1');
            echo 'hello';
            $output = `/var/www/scale4`;
            echo $output;
            
?>

        </body>
</html>
I thank all of you for your patience and help. This lifts a tremendous burden off my head!!!
This User Gave Thanks to Meow613 For This Post:
Corona688
 

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