Need Help with LCD screeen.

Comments

• sylvie369 Posts: 1,622

  2008-12-20 12:50 edited 2008-12-20 12:50

  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 Posts: 1,622

  2008-12-20 18:54 edited 2008-12-20 18:54

  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.

  bs2

  bs2

  LCDAppmod BS2 Only.bs2

  8K

  bs2

  bs2

  LCDAppmod BS2p pe px Only.bs2

  7K

  LCDAppmod BS2 Only.bs2 8.1K

  LCDAppmod BS2p pe px Only.bs2 7.4K
• jdpetersdoc Posts: 26

  2008-12-22 23:11 edited 2008-12-22 23:11

  ·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 Posts: 1,622

  2008-12-23 00:55 edited 2008-12-23 00:55

  It's behind that box over in the corner.
• jdpetersdoc Posts: 26

  2008-12-23 03:11 edited 2008-12-23 03:11

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