Propeller writing to SparkFun Serial LCD

Comments

• StevenG Posts: 9

  2010-07-02 18:03 edited 2010-07-02 18:03

  Ok. I've written a small program to write ASCII characters to the LCD but I can't seem to get any of the LCD commands to work. They almost always come up as two vertical lines in one character space. I have attached the code I am using.
  
  The code should turn on the Blinking Box Cursor and then write "Hello World!" to the LCD. Instead it prints "||Hello World!".
  
  humm.........
  
  

  CON
  
    baud            = 9600                                          ' baud rate
    pin             = 0                                             ' tx pin
    _clkmode        = xtal1 + pll16x
    _xinfreq        = 5_000_000
  
    
    LCD_BKSPC     = $10                                   ' move cursor left
    LCD_RT        = $14                                   ' move cursor right
    LCD_CLS       = $01                                   ' clear LCD (follow with 5 ms delay)
    LCD_SET       = $7C                                   ' LCD Set Parameter
      LCD_BL1     = 128                                   ' Set backlight to 0%
      LCD_BL2     = 140                                   ' Set backlight to 40%
      LCD_BL3     = 150                                   ' Set backlight to 73%
      LCD_BL4     = 157                                   ' Set backlight to 100%
  
      LCD_SST     = $09                                   ' Toggle Splash Screen
      LCD_SSS     = $0A                                   ' Save current screen to splash screen
  
      LCD_24      = $4B                                   ' Set Baud to 2400
      LCD_48      = $4C                                   ' Set Baud to 4800                        
      LCD_96      = $4D                                   ' Set Baud to 9600
      LCD_144     = $4E                                   ' Set Baud to 14400
      LCD_192     = $4F                                   ' Set Baud to 19200
      LCD_384     = $50                                   ' Set Baud to 38400
      
    LCD_OFF       = $08                                   ' LCD visual off
    LCD_ON        = $0C                                   ' LCD visual on
    LCD_CRON      = $0E                                   ' LCD cursor on
    LCD_CROFF     = $0C                                   ' LCD cursor off
    LCD_BXON      = $0D                                   ' Blinking box cursor on
    LCD_SR        = $1C                                   ' LCD scroll right
    LCD_SL        = $08                                   ' LCD scroll left
    LCD_CRP       = $80                                   ' LCD set cursor position + position 
    
  OBJ
  
    serial : "simple_serial"                              ' bit-bang serial driver
  
  PUB init | Temp
  
    waitcnt(clkfreq / 4_000 + cnt)  
    serial.init(-1, pin, baud)
    waitcnt(clkfreq / 200 + cnt)
    serial.tx(LCD_BXON)
    waitcnt(clkfreq / 200_000 + cnt)
    serial.str(string("Hello World!"))                              
  
  
• Harley Posts: 997

  2010-07-02 18:09 edited 2010-07-02 18:09

  One thing I note is there is no 'repeat'. Your code just runs to the last instruction ONCE.
  
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  Harley Shanko
• grouchy Posts: 16

  2010-07-03 01:46 edited 2010-07-03 01:46

  try this, what I use for my sparkfun serial lcd.
  
  note that if your using the 3.3v lcd, it sometimes gets confused at power up if the usb plug is connected (on the demo board). To reset the lcd, remove the usb plug as well as power down the demo board.
  
  
  
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  spin

  spin

  sfserial_lcd.spin

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• mpark Posts: 1,322

  2010-07-03 15:35 edited 2010-07-03 15:35

  Grouchy, cute use of lookdown!
  
  StevenG, you have to send $fe before sending a command byte.
• StevenG Posts: 9

  2010-07-03 16:23 edited 2010-07-03 16:23

  Ya I forgot about the whole command byte thing. The $FE common byte doesn't work for the backlight and some other commands. You have to send the $7C command for those. It takes a little trial and error to figure out which one requires what. Thanks a lot Grouchy that helped a ton!!!