I Have A Code That Sends A Byte At F0 At 200 Baud And Then 5 Bytes At 10400.How I Loop It Continously?

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C

serial

communication

I have written a code that sends the byte OF at 200 bps and then should send 5 bytes at 10400, i need to loop this data continuously, how can this be done? i use two while loop one for sending single byte at 200 and then again another for sending 5 bytes of data at 10400, when i start the program i can see the OF being transmitted and only when i press a key, i see the 5 bytes being transferred, i want all these in a single shot. How to do it. Here is the attached code.

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <dos.h>
#include <process.h>
#define true 1

int main()
{
   // int _kbhit();
   // int _getch();

   // Defining hexadecimal bytes to be sent a 200 bps for generation of low high sequence//
   unsigned char bytes_to_send[1];
   bytes_to_send[0] = 0xF0; /* 11110000b */
   unsigned char databytes_send[5];
   databytes_send[0] = 0x81;
   databytes_send[1] = 0x11;
   databytes_send[2] = 0xF1;
   databytes_send[3] = 0x11;
   databytes_send[4] = 0x04;

   /*int GetPressedKey()
   {
      int ret = 0;
      if (_kbhit())
      {
         ret = _getch();
      }
      return ret;
    }*/
   // Declare variables and structures//
   HANDLE hSerial;
   DCB dcbSerialParams = {0};
   COMMTIMEOUTS timeouts = {0};

   // Open the available serial port number//
   fprintf(stderr, "Opening serial port...");
   hSerial = CreateFile("COM4", GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
   if (hSerial == INVALID_HANDLE_VALUE)
   {
      fprintf(stderr, "Check for port connections\n");
      return 1;
   }
   else
      fprintf(stderr, "OK\n");
   // Set device parameters (200 baud, 1 start bit, 1 stop bit, no parity)
   dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
   if (GetCommState(hSerial, &dcbSerialParams) == 0)
   {
      fprintf(stderr, "Error getting device state\n");
      CloseHandle(hSerial);
      return 1;
   }

   // Set baudrate to send bytes at 200 bps//
   dcbSerialParams.BaudRate = 200;
   dcbSerialParams.ByteSize = 8;
   dcbSerialParams.StopBits = ONESTOPBIT;
   dcbSerialParams.Parity = NOPARITY;
   if (SetCommState(hSerial, &dcbSerialParams) == 0)
   {
      fprintf(stderr, "Error setting device parameters\n");
      CloseHandle(hSerial);
      return 1;
   }

   // Set COM port timeout settings//
   timeouts.ReadIntervalTimeout = 50;
   timeouts.ReadTotalTimeoutConstant = 50;
   timeouts.ReadTotalTimeoutMultiplier = 10;
   timeouts.WriteTotalTimeoutConstant = 50;
   timeouts.WriteTotalTimeoutMultiplier = 10;
   if (SetCommTimeouts(hSerial, &timeouts) == 0)
   {
      fprintf(stderr, "Error setting timeouts\n");
      CloseHandle(hSerial);
      return 1;
   }
   while(true)
   {
      // Send specified text (remaining command line arguments)
      DWORD bytes_written = 0;
      fprintf(stderr, "sending bytes...\n");

      while(1)
      {
         //Transmit slow initialization data
         if (!WriteFile(hSerial, bytes_to_send, 1,&bytes_written, NULL))
            // break;

         fprintf(stderr, "%d bytes written\n", bytes_written);

            //check for key press event
            /*if (GetPressedKey()) */
              // break;
      }


      // Open the available serial port number//


      // Set device parameters (200 baud, 1 start bit, 1 stop bit, no parity)
      dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
      if (GetCommState(hSerial, &dcbSerialParams) == 0)
      {
         fprintf(stderr, "Error getting device state\n");
         CloseHandle(hSerial);
         return 1;
      }
      // Set baudrate to send bytes at 10400 bps 8 N 1//

      dcbSerialParams.BaudRate = 10400;
      dcbSerialParams.ByteSize = 8;
      dcbSerialParams.StopBits = ONESTOPBIT;
      dcbSerialParams.Parity = NOPARITY;
      if (SetCommState(hSerial, &dcbSerialParams) == 0)
      {
         fprintf(stderr, "Error setting device parameters\n");
         CloseHandle(hSerial);
         return 1;
      }

      // Set COM port timeout settings//
      timeouts.ReadIntervalTimeout = 50;
      timeouts.ReadTotalTimeoutConstant = 50;
      timeouts.ReadTotalTimeoutMultiplier = 10;
      timeouts.WriteTotalTimeoutConstant = 50;
      timeouts.WriteTotalTimeoutMultiplier =10;
      if (SetCommTimeouts(hSerial, &timeouts) == 0)
      {
         fprintf(stderr, "Error setting timeouts\n");
         CloseHandle(hSerial);
         return 1;
      }

      while(1)
      {
         //Transmit fast initialization data
         if (!WriteFile(hSerial, databytes_send, 5, &bytes_written, NULL))
            // break;

         fprintf(stderr, "%d bytes written\n", bytes_written);

         //Check for key press event
         /*   if (GetPressedKey())
         */
             break;
      }

      CloseHandle(hSerial);

      if (!WriteFile(hSerial, bytes_written,6, &bytes_written, NULL))
      {
         fprintf(stderr, "End of transmission\n");
         CloseHandle(hSerial);
         return 1;
      }
      fprintf(stderr, "%d bytes written\n", bytes_written);

      // Close serial port
      fprintf(stderr, "Closing serial port...");
      if (CloseHandle(hSerial) == 0)
      {
         fprintf(stderr, "Error\n");
         return 1;
      }
      fprintf(stderr, "OK\n");

      // exit normally
      return 0;
   }
}