#include <windows.h>

int main(int argc, char *argv[])
{
   DCB dcb;
   HANDLE hCom;
   BOOL fSuccess;
   char *pcCommPort = "COM1";

   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.

   // SetupComm(hCom, 49152, 49152);
   COMMTIMEOUTS timout;
   timout.ReadIntervalTimeout = 0;
   timout.ReadTotalTimeoutMultiplier = 0;
   timout.ReadTotalTimeoutConstant = 0;
   timout.WriteTotalTimeoutMultiplier = 0;
   timout.WriteTotalTimeoutConstant = 0;
   SetCommTimeouts(hCom, &timout);

   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_2400;     // set the baud rate
   dcb.ByteSize = 8;             // data size, xmit, and rcv
   dcb.Parity = NOPARITY;        // no parity bit
   dcb.StopBits = TWOSTOPBITS;    // one stop bit
   dcb.fDtrControl = DTR_CONTROL_DISABLE;
   fSuccess = SetCommState(hCom, &dcb);
   fSuccess = GetCommState(hCom, &dcb);

   printf("DWORD0: %d\n", dcb.DCBlength);
   printf("DWORD1: 0x%08x\n", dcb.BaudRate);
   printf("DWORD2: 0x%08x\n", *((unsigned long *)(&dcb)+2));
   printf("DWORD3: 0x%08x (reserved:2,xon:2)\n", 
          *((unsigned long *)(&dcb)+3));
   printf("DWORD4: 0x%08x (xoff:2,bytesize,parity)\n", 
          *((unsigned long *)(&dcb)+4));
   printf("DWORD5: 0x%08x (Stopbits,xon,xoff,err)\n", 
          *((unsigned long *)(&dcb)+5));
   printf("DWORD6: 0x%08x (eof,ext,reserved:2)\n", 
          *((unsigned long *)(&dcb)+6));

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

   printf ("Serial port %s successfully reconfigured.\n", pcCommPort);
   char d[10] = "C",junk[10];
   COMSTAT stat1;
   DWORD err, count =0;
   int i, j, done = 0;
   
   PurgeComm(hCom, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR);
   ClearCommError(hCom, &err, &stat1);
   for (j = 0; j < 1000; j++) {
     PurgeComm(hCom, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR);
     WriteFile(hCom, &d, 1, &count, NULL);
     for(i = 0; i < 1; i++) {
        ClearCommError(hCom, &err, &stat1);
        if (stat1.cbInQue) {
          printf("Found %d chars in %d(%d) trys!\n", stat1.cbInQue, i, j);
          done = 1;
          break;
        }
      }
      if (done) {
        break;
      }
   }
   return (0);
}