Modified default code gives "code violation"

[Keith Watson]

Originally Posted by X-Istence

char joystick_input_2 = 0;
char drive_output = 0;

Why are these straight up char's and not unsigned?

Because of the line,

joystick_input_2 = joystick_input - 127;

joystick_input can be 0 to 255 so the result of this line can be a negative value, so the variables being assigned to must be signed.

Have you commented out the calls to SlowDrive() to prove that is where the runtime error comes from?

I don't know what this particular compiler does but I wonder about this line,

	joystick_input_2 = joystick_input - 127;

joystick_input is unsigned, so the temporary variable created is unsigned, then 127 is subtracted from that, then the temporary is assigned to joystick_input_2. Maybe that is it? To test this theory change that one line to this,

	joystick_input_2 = joystick_input;
	joystick_input_2 = joystick_input_2 - 127;

The first line handles the type change then the second line does exactly what you expect.