Your ElapsTime variable is a single character variable and yet you pass a string pointer to it. The strcat will not know where the end of the "string" is because you did not arrange for a sure zero at the end of the "string".

You should have a separate buffer for a working string and maybe use a sprintf() type function to format the ElapsTime variable into this separate buffer. Then pass the pointer to the separate buffer to strcat() so it has a legitimate string to manipulate.

You could also make the ElapsTime variable into a two byte array and set the second element to a value of zero. Then the line of code that increments the first byte value could become:

     ElapsTime[0]++;

Michael Karas