Problem with Serial LCD Display

aviator3.1 · 2010-04-20 15:24

Real quick,

I have read up on all the documentation regarding the Parallax 2x16 Serial LCD. When I place it in test mode I get the proper display on the screen

"Parallax, Inc.
www.parallax.com"

and after a while pac man starts to eat the characters up.

I'm assuming that if the test functions correctly that the display is in proper working order.

What is happening is I am setting the Baud Rate to 9600 with SW1 OFF and SW2 ON since I'm using the BS2. A cursor is showing up at line 0 character space 0.
When I go to load a simple program onto the BS2 such as the one found in the documentation nothing happens.

' Smart Sensors and Applications - LcdTestMessage.bs2
' Display a test message on the Parallax Serial LCD.
' {$STAMP BS2} ' Target device = BASIC Stamp 2
' {$PBASIC 2.5} ' Language = PBASIC 2.5
SEROUT 14, 84, [noparse][[/noparse]22, 12] ' Initialize LCD
PAUSE 5
SEROUT 14, 84, [noparse][[/noparse]"See this?", 13, ' Text message, carriage return
"The LCD works!"] ' more text on Line 1.
END ' Program end

This is not a new display that I just purchased but one I found laying around the lab and it doesn't appear to be damaged in any way.
I'm familiar with all the command sets used to write characters to the display but I'm not getting anything.

I've tried different baud rates and different pin numbers etc etc and nothing.

Has anyone encountered a problem like this before?

Thanks
-Dan

Moskog · 2010-04-20 15:52

·Will this code work for you?

' {$STAMP BS2}
' {$PBASIC 2.5}

 TX              PIN     14               ' serial output to LCD

' -----[noparse][[/noparse] Constants ]-------------------------------------------------------
#SELECT $STAMP
  #CASE BS2, BS2E, BS2PE
    T2400       CON     396
    T9600       CON     84
    T19K2       CON     32
  #CASE BS2SX, BS2P
    T2400       CON     1021
    T9600       CON     240
    T19K2       CON     110
#ENDSELECT
 
LcdBaud         CON     T9600           ' Baud rate 9600
LcdBkSpc        CON     $08             ' move cursor left
LcdRt           CON     $09             ' move cursor right
LcdLF           CON     $0A             ' move cursor down 1 line
LcdCls          CON     $0C             ' clear LCD (use PAUSE 5 after)
LcdCR           CON     $0D             ' move pos 0 of next line
LcdBLon         CON     $11             ' backlight on
LcdBLoff        CON     $12             ' backlight off
LcdOff          CON     $15             ' LCD off
LcdOn1          CON     $16             ' LCD on; cursor off, blink off
LcdOn2          CON     $17             ' LCD on; cursor off, blink on
LcdOn3          CON     $18             ' LCD on; cursor on, blink off
LcdOn4          CON     $19             ' LCD on; cursor on, blink on
LcdLine1        CON     $80             ' move to line 1, column 0
LcdLine2        CON     $94             ' move to line 2, column 0
 
 
Reset:
  HIGH TX                               ' setup serial output pin
  PAUSE 100                             ' allow LCD to initialize

Main:
  SEROUT TX, LcdBaud, [noparse][[/noparse]LcdBLoff, LcdOn1, LcdCls]
  PAUSE 250
  SEROUT TX, LcdBaud, [noparse][[/noparse]"See this?"]
  PAUSE 2000
  SEROUT TX, LcdBaud, [noparse][[/noparse]LcdCr]
  SEROUT TX, LcdBaud, [noparse][[/noparse]"The LCD works!"]
  PAUSE 2000
  SEROUT TX, LcdBaud, [noparse][[/noparse]LcdBLon]
  PAUSE 2000
  SEROUT TX, LcdBaud, [noparse][[/noparse]LcdBloff,Lcdoff]
  END

aviator3.1 · 2010-04-20 21:56

No it doesn't. I have tried that piece of code as well. I have tried almost every piece of code I could find documented.

I'm just under the assumption that if the test mode works then the display should be functioning properly. But its not working at any other time as if it has something locked in memory somewhere.

Adrian Schneider · 2010-04-21 10:48

I use

LCDBD       CON   16468               ' 8,n,9600,inv

for my serial (Seetron 4x16) LCD baudrate. Maybe your LCD works with that one?

Regards
Adrian

wizardonmain · 2010-10-17 17:01

I am having this same problem. There dose not seem to be a solution in this thread. Does anyone have some answers?

Problem with Serial LCD Display

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