Can defines be changed with port input?

[Acetronics2]

DEFINE LCD_LINES 2. the display seems unaffected when hooked up to a 4 line display, as it continues to correctly display 4 lines of data sent to it. SO THE QUESTION REMAINS, what good is the lines DEFINE if it doesn't limit the output to 2 lines?
JS

Hi,Joe

Those defines are written for most common types of displays ...

If using exotic displays ...you also have to verify their commands are those PbP sends when configurating the display ...

Mhhhh, now, If you DO NOT send data one after the other , but specify WHERE you want it to be written ...

Only 2 lines will be used ...

But YOU MUST Tell PbP you USE a 4 LINES Display ... PbP can't think you only WANT 2 lines ... no DEFINE for unwanted lines !!!

CQFD

Alain.