How to read from serial port in C

eng_girl · #1 25-Mar-2006, 02:04

hi, I want to know how can I read data through serial port in C using the Dev-C++ program ?

which libraries to use ?

any hint may help , thanks..........

#2 27-Mar-2006, 06:57

Quote:

Originally Posted by eng_girl

hi, I want to know how can I read data through serial port in C using the Dev-C++ program ?

which libraries to use ?

any hint may help , thanks..........

Basically, under Windows, you open a serial port with the CreateFile Win32 API specifying the serial port in the args list of the function.

The MSDN has a source example called mtty.c or something along those lines that is basically a Win32 terminal app.

In C (and C++), you'll find that there are no "devices" handling capability outside of basic file I/O and (usually console) stream I/O. Accessing a USB device, talking to a tape drive, running a serial or parallel port, networking, etc. are all device interfaces provided by specific operating system implementations. In other words, you have to use whatever "services" your operating system exposes to you to gain access to "low-level" devices.

:davis:

eng_girl · #3 27-Mar-2006, 16:04

Thanks for replying I saw an example in
www.boondog.com
go to-->tutorials---->GPS and Serial Interfacing

it uses some libraries to communicate with the serial port . I tried this example but I got so many errors . can anyone see this example and how to compile and run it?

PLz help!!!!!!!!!

tirtho · #4 24-Feb-2008, 23:51

Hi this is tirtho I have suffered from the same problem you have. I have some solution for it here is the code.

CPP / C++ / C Code:

#include <bios.h>
#include <conio.h>
#define COM1       0
#define DATA_READY 0x100
#define SETTINGS ( 0xC0 | 0x02 | 0x00 | 0x00)
int main(void)
{
   int in, out, status;
   bioscom(0, SETTINGS, COM1); /*initialize the port*/
   cprintf("Data sent to you:  ");
   while (1)
   {
      status = bioscom(3, 0, COM1); /*wait until get a data*/
      if (status & DATA_READY)
           if ((out = bioscom(2, 0, COM1) & 0x7F) != 0)  /*input a data*/
              putch(out);
           if (kbhit())
           {
              if ((in = getch()) == 27)   /* ASCII of Esc*/
                 break;
              bioscom(1, in, COM1);   /*output a data*/
           }
   }
   return 0;
}

If you have some problem regarding this program you can mail me I will help my best. This program is excellent for reading data of serial port. Better to use this program in DOS version C compiler.

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How to read from serial port in C

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