Need Help with LCD screeen.

jdpetersdoc

· I have the LCD Terminal AppMod, and I'm not sure how to program it. Im using the Basic Stamp 2, I downloaded the smiple code for it off parallax's website and I was really confussed in how to program it. If anyone has any suggestions I would appreciate it!



·Joshua Peters

·'If it doesnt do something automatic, then its not a Stamp.

sylvie369

The demo code is somewhat overly complicated, because it's meant to include the code for both the BS2 series and the BS2p series (which has additional commands that simplify control of parallel LCDs). All of that #IF _LcdReady #THEN stuff is compiler directives meant to choose code for one or the other type of Stamp, and is not relevant to what you need. For example, look at this subroutine:

LCD_Command: ' write command to LCD
#IF _LcdReady #THEN
LCDCMD E, char
RETURN
#ELSE
LOW RS
GOTO LCD_Write_Char
#ENDIF

LCD_Write_Char: ' write character to LCD
#IF _LcdReady #THEN
LCDOUT E, 0, [noparse][[/noparse]char]
#ELSE
LcdBusOut = char.HIGHNIB ' output high nibble
PULSOUT E, 3 ' strobe the Enable line
LcdBusOut = char.LOWNIB ' output low nibble
PULSOUT E, 3
HIGH RS ' return to character mode
#ENDIF
RETURN

Since you have a BS2, what you need is

LCD_Command: ' write command to LCD
LOW RS
LcdBusOut = char.HIGHNIB ' output high nibble
PULSOUT E, 3 ' strobe the Enable line
LcdBusOut = char.LOWNIB ' output low nibble
PULSOUT E, 3
HIGH RS ' return to character mode
RETURN

Everything else in there is simply there to show how a BS2p or BS2pe would handle things. On those processors, the subroutine would look like this

LCD_Command: ' write command to LCD
LCDCMD E, char
RETURN

Try going through the code and removing everything that is for the "LcdReady" processors, and see if what's left makes more sense to you. I had to look at it all quite a few times before I understood it.

sylvie369

Here (attached) are versions of the LCDAppmod demo program with most of the conditional stuff removed (I left in the part that tells you which BS2 chip you're using). These should make it much more clear how to use the LCD Appmod, and also what the advantages of using a 2p, 2px, or 2pe module are with a parallel LCD.

jdpetersdoc

·sylvie369,

·· It makes sense now, theres onl;y one problem.........I cant find my LCD screen now .



I apperciate you writing that code.....Ill try and fing my LCD screen, it couldnt have gone to far .

sylvie369

It's behind that box over in the corner.

jdpetersdoc

hahaha......yeah.··· Ill find dont worry. But thanks again for the help !!!