HELP with storing serial port data into txt file
I have a programming which draws a graph for .txt data and other things.
Im trying to make this code take single character inputs from the serial port and store them into a txt file as an integer along with the date and time. I think im ok with the date and time. but im not sure how to change what ive done to save data to a txt file. At the mo it just keeps taking inputs, displaying them and sends out _kbhit's.
Previously i was just manually inputing the data as you can see from the commented code at the top.
I have been tying to overcome this problem for days now so any help welcome. Here is my code, thanks.
Code:
int GetReadings(int nReadings, int *pReadings)
{
/*int iReadings;
printf("Enter readings, one at a time.\n");
for(iReadings = 0; iReadings < nReadings; iReadings++){
printf("Enter readins #%i: ", iReadings+1);
scanf("%i", pReadings++);
}
return nReadings;
*/
unsigned char c;
DCB dcb;
HANDLE hCom;
char *pcCommPort;
int portno;
int nErrNo;
DWORD nWritten, nRead;
COMMTIMEOUTS CommTimeOuts;
// Which port is to be used 1 or 2?
printf("Which port (1/2)?: ");
scanf("%d",&portno);
if(portno == 1)pcCommPort = "COM1";
else pcCommPort = "COM2";
// "Open" the port and get a handle to it
hCom = CreateFile( pcCommPort,
GENERIC_READ | GENERIC_WRITE,
0, // exclusive-access
NULL, // no security attributes
OPEN_EXISTING, // comm devices must use OPEN_EXISTING
0, // not overlapped I/O
NULL // must be NULL for comm devices
);
if (hCom == INVALID_HANDLE_VALUE) {
printf ("CreateFile failed with error %d.\n", GetLastError());
return 0;
}
// Get the device control block for the port, check it's OK...
if (!GetCommState(hCom, &dcb)) {
printf ("GetCommState failed with error %d.\n", GetLastError());
return 0;
}
// ...and adjust the values to baud=9600 bps, 8 data bits, no parity, and 1 stop bit...
dcb.BaudRate = CBR_9600; // set the baud rate
dcb.ByteSize = 8; // data size, xmit, and rcv
dcb.Parity = NOPARITY; // no parity bit
dcb.StopBits = ONESTOPBIT; // one stop bit
// ...and write the device control block back.
if (!SetCommState(hCom, &dcb)) {
printf ("SetCommState failed with error %d.\n", GetLastError());
return 0;
}
// Set up the comm timeouts
if(!GetCommTimeouts(hCom, &CommTimeOuts)) {
printf ("GetCommTimeouts failed with error %d.\n", GetLastError());
return 0;
}
CommTimeOuts.ReadIntervalTimeout = MAXDWORD; // This combination of values
CommTimeOuts.ReadTotalTimeoutConstant = 0; // ..causes ReadFile to return
CommTimeOuts.ReadTotalTimeoutConstant = 0; // ..immediately even if no chars rec'd
if (!SetCommTimeouts(hCom, &CommTimeOuts)) {
printf ("SetCommTimeouts failed with error %d.\n", GetLastError());
return 0;
}
printf ("Serial port %s successfully reconfigured.\n", pcCommPort);
printf("Starting TTY emulator.\n");
// Loop around reading the keyboard and comm port
while(c != 'X'){
if(_kbhit()){
c = _getch();
if(WriteFile(hCom, &c, (DWORD)1, &nWritten, NULL) != 0)
if((nErrNo = GetLastError()) != ERROR_SUCCESS)
printf("\nWriteFile error: %d", GetLastError());
}
if(ReadFile(hCom,&c,(DWORD)1,&nRead,NULL) == 0)
printf("ReadFile error\n");
if(nRead > 0)
putchar(c);
}
}
