Serout2 on LCD Shows Junk Characters

[gadelhas]

try with APFCON0.2 = 1, because the chip is initialized with TX on the RC4 pin, (APFCON0.2 = 0), so you must change it. datasheet page 123.

[Darrel Taylor]

The Scott Edwards display is expecting Inverted serial levels.
The USART puts out True levels by default.

Add this setting ...

BAUDCON.4 = 1  ; Transmit inverted data to the TX/CK pin

[RossWaddell]

The Scott Edwards display is expecting Inverted serial levels.
The USART puts out True levels by default.

Add this setting ...

BAUDCON.4 = 1  ; Transmit inverted data to the TX/CK pin

Thanks Darrel! It works now except the LCD shows a strange character in the 1st position (looks like "F1" with the "1" being a subscript).

#IFDEF USE_LCD_FOR_DEBUG
    HSEROUT [LCD_INST, LCD_CLR]
    pause 5
    HSEROUT ["DutyVar1=", DEC DutyVar1, 13, 10] ' Send text followed by carriage return and linefeed
#ENDIF

Main:
   ADCIN 1, adval
   if adval <> oldDutyVar1 then
      oldDutyVar1 = adval
      DutyVar1 = adval

      #IFDEF USE_LCD_FOR_DEBUG
         HSEROUT [LCD_INST, LCD_CLR, LCD_L1]
         HSEROUT ["DutyVar1=", DEC DutyVar1, "  ", 13, 10] ' Send text followed by carriage return and linefeed
      #ENDIF
   EndIf
   Pause 100
Goto Main

[Darrel Taylor]

HSEROUT [LCD_INST, LCD_CLR, LCD_L1]

You need at least a 2mS pause after the clear screen command.
Then you need another LCD_INST before the LCD_L1.
Or just leave out the LCD_L1 since the clear screen leaves the cursor on line 1.

[RossWaddell]

I have a 5ms pause before the Main loop, but I think it's irrelevant since the ADCIN gets a value which is immediately different than the set value for DutyVar1 (set to 0 earlier in the code) and hence it goes straight into the IF block.

I'll add a 5ms pause in the IF block, too. And remove the LCD_L1 if it's not needed.

Thanks again, Darrel!