Quote Originally Posted by jorge View Post
Is it possible to initialize and config all the defines and Ports on the run without compromise the reliability of the all system?
One thing that can cause garbage characters like that is when a 4-bit interface gets out of sync, and it gets the low nibble from the last byte with the high nibble of the next byte.

Sometimes you can toggle the E line once to get it back in sync, but to detect when to do that you need to have the R/W line connected to the PIC so you can see the busy flag. If it's not busy for 1.6mS after giving it a clear screen command ($FE,1) then it's probably out of sync.

With an 8-bit interface that error can't happen.

You can also re-initialize the LCD by clearing PBP's FLAGS system variable.
On the next LCDOUT statement it will start from scratch as if power was turned on.

Code:
FLAGS = 0
LCDOUT $FE,1
In some cases, an LCD cannot be reset from software. It takes a power down sequence.
If the LCD is powered from a PIC pin, you can cycle power to the LCD, then clear the FLAGS variable.