pgmfi.org

#include <windows.h>
#include <stdio.h>
#define   LOOP 255

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.

   fSuccess = GetCommState(hCom, &dcb);

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

   // Fill in DCB: 38,400 bps, 8 data bits, no parity, and 1 stop bit.

   dcb.BaudRate = CBR_38400;     // 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);

//This is where I began coding
   
   OVERLAPPED osWrite = {1};
   OVERLAPPED osRead = {1};

   int      x,
         code = 22;             //Ignition Timing
   DWORD   byteswrittensofar,
      bytesreadsofar,
      timing = 0;

   for(x = 0; x < LOOP; x++)
   {
   if(!WriteFile(hCom, &code, 2, &byteswrittensofar, &osWrite))
      printf("Can't Send Data!\n");

   if(!ReadFile(hCom, &timing, 2, &bytesreadsofar, &osRead))
      printf("Can't Read Data!\n");
   printf("Ignition Timing: %.2f\n", timing);
   }

return 0;
}

write( fd, string, 1 );