Codewarrior / c problem?

You have a potential buffer overrun here. j *must* be trapped if it's greater than or equal to BUFFER_LENGTH but length_of_incomming_str could be (is?) larger.

Oh, and you're not using The One True Brace Style. ;-)

The arrays are local in the function, so they are allocated on stack. How large has you configured the stack size? Try add a "static":

static unsigned char disp_con[4][6] = {0};

Then it will be allocated somewhere in the RAM (but it is not local anymore to the function, but same as if you woul declare it as a global variable).

But looks like the disp_con variable is not used anyway in the rest of your code, so you can delete this.

It looks like you are using a total of 77 bytes of stack for local variables. I would be sure your stack can handle that much allocation.

Maybe I am not up on all my C concepts, but in your first two arrays, are you trying to zero them out using the "= {0};"? If those arrays were either declared global or static (which is preferred over global), they would be zeroed by the compiler once on startup, unless you specifically tell it not to do that. In your code, are you expecting the arrays to be automatically cleared every time the function is entered? I don't think it does that, if that is what you want.

Lou

In that case you would be thinking incorrectly. The C compiler is definitely required to perform all explicit initialization of automatic variables every time their enclosing block begins executing.

You may be mixing this up with a closely related case: it's not required to initialize variables that have no explicit initializer. I.e. a variable

{ int random_garbage; /* ... */ }

will contain exactly that.

It depends on the compiler setting. "Full ANSI C" mode in the Codewarrior HC08 compiler. You can set it to do minimal initialization before jumping to main(), only setting the stack pointer, and maybe a few other tiny things, but it won't zero global variables.

I meant to type more there:

There are forums at

Yes, you are correct. I use it so little that I had forgotten that. I almost always initialize local variables in the code, so I had forgotten initializing in that way. Thanks.

Lou