Serial LCD syntax help

[flotulopex]

Well,

I've still some trouble. Characters appears but nothing consitant or logical.

I have attached both explanations I have about how to send commands to the display (in German "D" and English "E"). Don't be afraid, they're very short.

The display is directly connected through a 1k resistor to the PIC.

I've set the baudrate to 300 now; but still strange characters appear.

I have also tried out all the 300bds and 2400bds modes described in the Compiler's manual without any success.

Here's my code:

'-------------------------------------------------------------------------------
' Fuses
@ DEVICE PIC16F88,INTRC_OSC_NOCLKOUT
@ DEVICE PIC16F88,PROTECT_OFF
@ DEVICE PIC16F88,WDT_OFF
@ DEVICE PIC16F88,PWRT_ON
@ DEVICE PIC16F88,MCLR_ON
@ DEVICE PIC16F88,BOD_OFF
@ DEVICE PIC16F88,LVP_OFF
@ DEVICE PIC16F88,CPD_OFF
@ DEVICE PIC16F88,DEBUG_OFF
@ DEVICE PIC16F88,CCPMX_OFF

'-------------------------------------------------------------------------------
' Registers
PORTB       = %00000000  'Drive all ports B low
TRISB       = %00000000  'Segments - Set Inputs/Outputs on PORTBs (direction)
OSCCON      = %01100000  'Internal RC set to 4MHz
ANSEL       = %00000000  'Disable Analogue Inputs
ADCON0      = %00000000  'A/D converter is OFF

'-------------------------------------------------------------------------------
' Circuitery
'PORTB.0 = TX

'-------------------------------------------------------------------------------
' Init
DEFINE SER2_BITS 8 'Set number of data bits for Serin2 and Serout2 
'DEFINE SER2_ODD 1 'Use odd parity instead of even parity 
Data_Out VAR PORTB.0

'-------------------------------------------------------------------------------
' Program
pause 1000  'Stabilize the PIC (mybe not needed)
serout2 data_out , 36081, [27,76,$0]
end

Any idea what I'm doing wrong?

[BobK]

Hi Flotul,

What is the baud rate of the Serial Module on the LCD? Most of the ones I have seen are either 2400 or 9600. With the internal clock at 4mhz the best you can hope for is 2400 because of the not so stable clock freq. I use a Seetron Serial LCD @2400 and it works fine. I have some other Serial LCD's that I am trying that I got from Wulfden.org but he has a different command structure that uses ? in fron of the command letter. I get data displayed but it's all running together. Always the time factor.

Try putting a crystal or resonator on your PIC and see if theat doesn't help.

HTH,

BobK