ledDigitDisplay crashes the program, how to debug

[Thieso]

Hello,

I wrote a program to display LEDDigits and update them once every few seconds. I use the function ledDigitsDisplay() for that and let the IDE create the code for that (using the paste code button). I use this inside a loop which also reads data over serial.
The problem is that the ledDigitsDisplay() method seems to crash the program. When I write a simple program which only shows increasing numbers it works fine but in my program after updating the numbers 3 times it crashes (display goes blank and unresponsive).
If I change the number I send over serial the number of times it works changes (for example to 5). So I think there is some overflow or something like that going on. But I can find it and I don't know how to debug it in a way to find it.

Below you find my code

counter := 0;
    value := 0;
    repeat
        chReceived := serin1();
        if (chReceived > 0)
            // Store character in the buffer
            str_PutByte(pchTextBuffer + counter, chReceived);
            counter += 1;
            if (counter >= messageSize)
                //str_Printf(&pchTextBuffer, "%2s");
                //putstr(pchTextBuffer);
                //putstr("hallo");
                str_GetC(&pchTextBuffer, &typeS);
                if (str_FindI(&typeS, "S"))
                    print("jöasdf");
                endif
                //putch(typeS);
                str_GetD(&pchTextBuffer, &value);
                print(value, "\n");
                // Speed 1.0 generated 5/14/2019 2:08:39 AM
                ledDigitsDisplay(value, iRPM+1, 176, 4, 1, 33, 1);
                //ledDigitsDisplay(value, iSpeed+1, 0, 3, 1, 59, 1);
                counter := 0;
            endif
        endif
    until (com_Error());

[John Kevin]

Hi,

Are you passing an integer value on the 'LedDigit' widget?
Can you please explain how the values are passed into the Serial? This can help us to further understand your program.

Best regards,
Kevin

[Thieso]

Hi Kevin,

Yes as far as I know the value parameter is an integer.
So I send for example the string "S1234" over serial. Then the typeS parameter gets the value "S" and the value parameter gets the value "1234". That works for my code since when I print them it shows the correct values.
I don't know how to explicitly tell the program that value is an integer.

Thanks for your help

Best regards
Thies

[Thieso]

Hi Kevin,

Do you have any Idea on how to fix this? I am still struggling with this.

Thanks
Thies

[kayven@4d]

Hi,

If you are in serial UART protocol, the bad connection will result in misreading the values over the serial.
And also stable parsing of data over serial is very important.

First of all, you need a way of debugging.
So, you can use Terminal in the Tool menu. This will help you observe the receiving of data over serial:

Here is the code for debugging;

var receive_data;

func main()
      com_SetBaud(COM0,960);    // initialize com port 0

      repeat
          receive_data : = serin();      // store unsigned 16bit data from com0

          if(receive_data  >  0)          
              to(COM0);                        // show the values in the terminal
              serout(receive_data);
          endif
      forever

endfunc

And parse it one by one especially the value required for the LedDigit function is an unsigned 16bit integer.

Right now, we'll try to figure out what we can do about your concern and we'll post it here as soon as possible.



Best regards,
Kayven

[Thieso]

Hi Kayven,

thanks for your response and the suggestion for debugging. I tried around a bit on my own and figured out where the problem lies. If I reset the array (reinitialize) after every time I read in 4 chars then the problem is solved. So I basically just added

pchTextBuffer = str_Ptr(pchTextBuffer);

before the

counter := 0;

line and that solved the problem. What baffles me about this is that the ledDigitsDisplay() method does not even interact with the buffer but if I comment it out everything works fine.
So I have no clue what causes this weird behaviour but maybe this helps you or future people with this problem to resolve it

Best regards
Thies

[kayven@4d]

Hi,

Thank you for your findings.

You manage your problem well.

If you have time, you could try to store the value of your variable "value" to another variable, then use this variable in your ledDigit function.


Best regards,
Kayven.