/*
 * This is an example file showing how to send data to the serial port.
 *
 * It does not include error checking.
 */
#include <windows.h>
#include <commctrl.h>
#include <stdio.h>

#define DEVICE "COM1"


HANDLE openPort(char *device);
void closePort(HANDLE serial);

int main()
{
    HANDLE serial;
    DWORD outBytes;
    
    serial = openPort(DEVICE);
    
    if (serial == INVALID_HANDLE_VALUE)
        return(1);

    WriteFile(serial, "Hello World", 11, &outBytes, NULL);

    closePort(serial);
        
    return(0);
}


/***************************************************************************
 *  Serial functions
 **************************************************************************/

/* Open raw serial port using:
 *    8 data bits
 *    1 stop bit
 *    19200 bps
 *    no parity
 */
HANDLE
openPort(char *device)
{
    HANDLE serial;
    DCB dcb;
    
    serial = CreateFile( device,  
                         GENERIC_READ | GENERIC_WRITE, 
                         0, 
                         NULL, 
                         OPEN_EXISTING,
                         FILE_ATTRIBUTE_NORMAL,
                         NULL);

    if (serial == INVALID_HANDLE_VALUE)
        return(serial);
        
    dcb.DCBlength = sizeof(dcb);

    if (!GetCommState(serial, &dcb))
    {
        closePort(serial);
        return(INVALID_HANDLE_VALUE);
    }

    dcb.BaudRate = CBR_19200;
    dcb.ByteSize = 8;
    dcb.Parity   = NOPARITY;
    dcb.StopBits = ONESTOPBIT;

    dcb.fDtrControl     = DTR_CONTROL_ENABLE;
    dcb.fRtsControl     = RTS_CONTROL_ENABLE;

    dcb.fOutxCtsFlow    = FALSE;
    dcb.fOutxDsrFlow    = FALSE;
    dcb.fDsrSensitivity = FALSE;
    dcb.fOutX           = FALSE;
    dcb.fInX            = FALSE;
    dcb.fTXContinueOnXoff = FALSE;

    dcb.fParity = FALSE;

    if (!SetCommState(serial, &dcb))
	{
	     closePort(serial);
	     return(INVALID_HANDLE_VALUE);
	}
	
	return(serial);
}

void
closePort(HANDLE serial)
{
    CloseHandle(serial);
}