#include <windows.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
DCB dcb;
HANDLE hCom;
BOOL fSuccess;
char *pcCommPort = "COM2";

hCom = CreateFile( pcCommPort,
GENERIC_READ | GENERIC_WRITE,
0, // must be opened with exclusive-access
NULL, // no security attributes
OPEN_EXISTING, // must use OPEN_EXISTING
0, // not overlapped I/O
NULL // hTemplate must be NULL for comm devices
);

if (hCom == INVALID_HANDLE_VALUE)
{
// Handle the error.
printf ("CreateFile failed with error %d.\n", GetLastError());
return (1);
}

// Build on the current configuration, and skip setting the size
// of the input and output buffers with SetupComm.

fSuccess = GetCommState(hCom, &dcb);

if (!fSuccess)
{
// Handle the error.
printf ("GetCommState failed with error %d.\n", GetLastError());
return (2);
}

// Fill in DCB: 57,600 bps, 8 data bits, no parity, and 1 stop bit.

dcb.BaudRate = CBR_57600; // set the baud rate
dcb.ByteSize = 8; // data size, xmit, and rcv
dcb.Parity = NOPARITY; // no parity bit
dcb.StopBits = ONESTOPBIT; // one stop bit

fSuccess = SetCommState(hCom, &dcb);

if (!fSuccess)
{
// Handle the error.
printf ("SetCommState failed with error %d.\n", GetLastError());
return (3);
}

printf ("Serial port %s successfully reconfigured.\n", pcCommPort);
return (0);
}

#include <windows.h>
#include <stdio.h>
#include <winbase.h>

int main(int argc, char *argv[])
{
DCB dcb;
HANDLE hCom;                              
BOOL fSuccess;                            
BYTE Data;                                
DWORD Pocet;                             
COMMTIMEOUTS CommTimeouts;
char *pcCommPort = "COM2";

hCom = CreateFile(                 
         pcCommPort,                      
         GENERIC_READ | GENERIC_WRITE,   
         0,                               
         NULL,                            
         OPEN_EXISTING,                 
         0,                               
         NULL);                           


if ( hCom == INVALID_HANDLE_VALUE )
     {
         printf("\n Chyba:  Port sa neda otvorit.\n");
         system("pause");
         CloseHandle(hCom);
         return 0;
     }





DCB dcbSerialParams = {0};                  
dcb.DCBlength = sizeof(DCB);

dcb.BaudRate = CBR_57600; 
dcb.ByteSize = 8; 
dcb.Parity = NOPARITY; 
dcb.StopBits = ONESTOPBIT; 

fSuccess = SetCommState(hCom, &dcb);      

if (!fSuccess)
{
// Handle the error.
printf ("Nastavenie DCB zlyhalo %d.\n", GetLastError());
return (0);
}





//Zmena nastavení prerušení
COMMTIMEOUTS timeouts={0};
CommTimeouts.ReadIntervalTimeout = 50;  
CommTimeouts.ReadTotalTimeoutMultiplier = 10;  
CommTimeouts.ReadTotalTimeoutConstant = 50;    
 
fSuccess = SetCommTimeouts(hCom, &CommTimeouts);          

if (!fSuccess)
{
printf ("Nastavenie preruseni zlyhalo %d.\n", GetLastError());
return (0);
}

printf ("Port %s bol uspesne nastaveny.\n", pcCommPort);
return (0);





ReadFile(
              hCom,         
              &Data,        
              1,            
              &Pocet,       
              NULL);        

                         
}