Serial LCD problem

[NavMicroSystems]

Hi

Yes, it is meant to be an SPI interface. I had assumed SPI = serial, and therefore I should use SEROUT.

I have made the changes, but still no luck

Best regards
Richard

Richard,

could you post the changed code?

[mind]

Heya

Here is the code at the moment, after changes:

    INCLUDE "modedefs.bas"
    DEFINE OSC 4
    DEFINE CHAR_PACING 1000
@  DEVICE  PIC16F88, INTRC_OSC_CLKOUT, WDT_OFF, PWRT_ON, BOD_OFF, MCLR_OFF, PROTECT_OFF
    osccon = %01101110
    sspcon = %00110001
    trisb  = %00000000
    disable interrupt
    pause 500   ' wait for LCD to startup
    
    LCD_ChipSelect var portb.0
    LCD_CommandLow VAR portb.1
    LCD_SerialIn VAR portb.2
    LCD_Clock VAR portb.4

    SYMBOL mode = 5   ' tried mode 4 too
    
    HIGH LCD_ChipSelect
    LOW LCD_CommandLow
    shiftout LCD_SerialIn, LCD_Clock, mode, [$38]  ' function set
    pause 50
    shiftout LCD_SerialIn, LCD_Clock, mode, [$39]  ' function set
    pause 50
    shiftout LCD_SerialIn, LCD_Clock, mode, [$14]     ' bias
    pause 50
    shiftout LCD_SerialIn, LCD_Clock, mode,  [$78]     ' contrast set
    pause 50
    shiftout LCD_SerialIn, LCD_Clock, mode, [$5E]     ' contrast control
    pause 50
    shiftout LCD_SerialIn, LCD_Clock, mode,  [$6E]     ' follower control
    pause 200

    shiftout LCD_SerialIn, LCD_Clock, mode, [%00001111] ' display, cursor, blink all on
    pause 50
    shiftout LCD_SerialIn, LCD_Clock, mode, [$01]   ' clear display
    pause 50

    HIGH LCD_CommandLow
    
loop:
    shiftout LCD_SerialIn, LCD_Clock, mode, ["Hello world"]
    Pause 500	' Wait .5 second
    Goto loop	' Do it forever

Best regards
Richard

[NavMicroSystems]

Richard,

I'm sorry I have to say this, but I'm not going to study the entire Datasheet for you.

Here are some hints:

- ChipSelect is active LOW, not HIGH
- Data is sent MSB first with clock Idling HIGH --> Mode 5
- Set OSCON according to your clock source and speed ($60 for 4MHz INTRC)

Your schematic would also help to analyze the problem.

[Dwayne]

Hello Richard,

I still do not see a 13 being passed to your LCD in your code...

Comment out all the wacky stuff....ALL of it....

Send just the 13 and Hello world.

I think you are bitin off more than you can chew all at once my friend.

Make sure you have a pause 500 (1/2 second delay to make sure the LCD is turn on and "warmed up" (as I call it).

A 1/2 second pause before you send the 13, and a 1/2 second pause after you send the 13... then send Hello world.

Dwayne

[NavMicroSystems]

Dwayne,

thanks for trying to help,
but at the moment there are other problems that "13"

You can send as many "13's" as you want,
if the Controller is never selected it will just do nothing!

[Dwayne]

Hello Richard,

You made a comment, that this is your first project...

One projects as such, it is best to go the very BASICS of everything. Do not add bells and whistles *until* you get the crazy thing working. You said it was HD44780 compatible...

Sending a Dec 13 will turn on the display and allow you to print ascii to it. This should be your main concern... NOT whether it blinks, does whistles, changes lines, smokes cigarettes for you, or drinks beer. 8-}

AFter you get just those two things to work.. THEN experiement with one added command at a time....

You are slowly eliminating variables... one at a time... instead of trying to elminate 15 variables... in which one of those 15 could be what you really need!

Dwayne

[NavMicroSystems]

DWAYNE,

PLEASE...

[Dwayne]

Hello Ralph,

thanks for trying to help,
but at the moment there are other problems that "13"

You can send as many "13's" as you want,
if the Controller is never selected it will just do nothing!

Gosh you ought to be proud of me remembering to "Quote" <chuckle>

I agree with you... I sent another message... I just see so many "Variables" he is trying to play with...When he should only be concerned with one Variable...Turning it on. And possibly another... Writing "Hello" to it to verify that it is turned on.

I have not used the Shiftout method... you did a splinded job on seeing that in the Data sheet. I can only assume he knows how to write to the controller... (how ever that is)... LIke you said before(which I agree)... I am not going to read the manual of a LCD that I don't care to use... But you and I both know what it takes to "tickle" that LCD to make it write ASCII...

Dwayne

[NavMicroSystems]

Hello Ralph,
Gosh you ought to be proud of me remembering to "Quote" <chuckle>

I am proud, but now let's get back to the topic and focus on solving the problem.

(We don't want this thread to end up with a 3 three figures number of posts and 80% of them being off topic.)

[mind]

Hi Ralph

Thanks for the reply, and catching my inverted chip select level.

I already had mode 5 in my code, and 4MHz as my clock speed (line 5), so yes, I have read the data sheets, but since I am a ME, rather than EE, there could be something that I am missing. I figured it would be obvious to someone with experience

Best reagrds
Richard

[NavMicroSystems]

Richard,

are you saying it's working now?

[mind]

Hi Ralph,

Nope...

Best regards
Richard