CODEWITHSUNDEEP
carduinoserial-portreadfilearduino-uno
Zacknov
Zacknov

Reputation: 21

Error when retrieving data from the Arduino serial port with the C programming language

I want to retrieve data through the serial port from Arduino with the C programming language in realtime. The program at Arduino :

void setup() {
  Serial.begin(9600);
  }
   int i=1;
   void loop() {
   Serial.println(i);
   delay(1000);
   i++;
 }

Programs in c language:

#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>

int main()
{
    HANDLE hComm;
    hComm=CreateFile("\\\\.\\COM3",GENERIC_READ | GENERIC_WRITE, 0, NULL,OPEN_EXISTING,0,NULL );
    BOOL Status;
    DCB dcbSerialParams={0};

    dcbSerialParams.DCBlength=sizeof(dcbSerialParams);
    Status=GetCommState(hComm,&dcbSerialParams);

    dcbSerialParams.BaudRate=CBR_9600;
    dcbSerialParams.ByteSize=8;
    dcbSerialParams.StopBits=ONESTOPBIT;
    dcbSerialParams.Parity=NOPARITY;

    Status=SetCommState(hComm,&dcbSerialParams);

    COMMTIMEOUTS timeouts;
    timeouts.ReadIntervalTimeout=50;
    timeouts.ReadTotalTimeoutConstant=50;
    timeouts.ReadTotalTimeoutMultiplier=10;
    timeouts.WriteTotalTimeoutConstant=50;
    timeouts.WriteTotalTimeoutMultiplier=10;

    Status=SetCommMask(hComm,EV_RXCHAR);

    DWORD dwEventMask;
    Status=WaitCommEvent(hComm,&dwEventMask,NULL);

    char TempChar;
    char SerialBuffer[256];
    DWORD NoBytesRead;
    int i=0;

    FILE *fp;
    fp=fopen("data.txt", "w");
        do{
            Status=ReadFile(hComm,&TempChar,sizeof(TempChar),&NoBytesRead,NULL);
            SerialBuffer[i]=TempChar;
           printf("%c",SerialBuffer[i]);
           fprintf(fp, "%c", SerialBuffer[i]);
            i++;
         }
        while(1);

     CloseHandle(hComm);

    return 0;
}

When running, an error occurs:

enter image description here

Please help, what is the problem that caused the error? What is the correct program?

Upvotes: 0

Views: 145

Answers (1)

Piglet
Piglet

Reputation: 28950

As mentioned in the comments 0xc0000005 is an access violation.

Without putting much time into reading your code (you should debug it yourself) I'd say it in general is a bad idea to increment a variable within an infinite loop if that variable is used to index an array.

Also you never check of your ReadFile actually succeeds.

There is a reason why C books do not cover reading files befor indexing arrays and using control structures properly.

Upvotes: 1

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