Maximun Cable Length for PIC to LCD

[Darrel Taylor]

Apples it is ..

Built a 16F877A breadboard. With LCD on the above mentioned ports.
Still haven't hooked up the ribbon yet, just wanted 1 LCD at this point.

Here's the Breadboard.

Click image to enlarge

And here's the program it's running.

@  __config _HS_OSC & _WDT_OFF & _LVP_OFF & _CP_OFF

ADCON1 = 7
CMCON = 7

DEFINE OSC 4

;----[ Change these to match your LCD ]---------------------------------------
LCD_DB4   VAR PORTB.0
LCD_DB5   VAR PORTB.1
LCD_DB6   VAR PORTB.2
LCD_DB7   VAR PORTB.3
LCD_RS    VAR PORTB.4
LCD_E     VAR PORTB.7
LCD_Lines     CON 2    ' # of Lines on LCD,  1 or 2 (Note: use 2 for 4 lines)
LCD_DATAUS    CON 50   ' Data delay time in us 
LCD_COMMANDUS CON 2000 ' Command delay time in us 

INCLUDE "LCD_AnyPin.pbp"  ; *** Include MUST be AFTER LCD Pin assignments ****

PAUSE 500 : LCDOUT $FE,1 : PAUSE 250 ; Initialize LCD (You may not need this,
                                     ;  but some displays are picky)

LCDOUT $FE,1,"Hello wildbilly",$FE,$C0,"Must be something",$FE,$94,"In the Hardware"

Main:
;    toggle LED
    pause 1000
goto Main

Can you see anything I've done different??
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[wildbilly]

Your apple must be the Macintosh because yours is working and mine is not.
Ok, here is what I have found. I have loaded your code to a new main program and could not compile it. I am getting this error: "opcode expected instead of '_config' "
for this line @ __config _HS_OSC & _WDT_OFF & _LVP_OFF & _CP_OFF

and I get these errors for this line : INCLUDE "LCD_AnyPin.pbp"
"opcode expected instead of 'writeport' "
"opcode expected instead of 'delayus' "
"opcode expected instead of 'outputport' "

I have checked the Hijack code included in the PBPPIC14.lib file and I think it was modified correctly. Any clues?

Thanks

[Darrel Taylor]

I am getting this error: "opcode expected instead of '_config'

Ah Ha, You aren't using MPASM as the assembler.

Almost anything written with ASM mixed in the program, needs to be compiled with MPASM. The assembler that comes with PBP is OK for PBP itself, but it just doesn't have the capabilities needed for ASM, even though sometimes it will compile OK.

Here's a hex file for mine if you want to try it.
If yours isn't runnung at 4Mhz, I'll change it to your crystal.
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[Ioannis]

Apples it is ..

Built a 16F877A breadboard. With LCD on the above mentioned ports.
Still haven't hooked up the ribbon yet, just wanted 1 LCD at this point.
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I can't add anything more on Darrels suggestions, but have to admit that the breadboard is very tidy good looking! An art in breadboarding!

The background that seems like a pcb, what is it?

Ioannis

[Darrel Taylor]

Thanks for noticing Ioannis,

The first breadboard I ever bought came with a box of 3M pre-cut jumpers.
I just thought that's the way it's supposed to be done.

Thanks to my "Glowing Eyed Monsters",
I also learned to trim the leads off of the parts so they sit flat on the breadboard.
There's another breadboard of mine in that thread too. Same style.

I never knew how bad a breadboard could be till I ran across this ...
http://cs.nyu.edu/~jhan/ledtouch/
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[wildbilly]

Yeah! He is indeed very neat. I am inspired to do the same. The background looks like a chair seat. Darrel your wildbilly.hex file ran ok. I have never used MPASM. I should try and get it going.

Thank you.

[Darrel Taylor]

The background looks like a chair seat.

DING! Give that man a cigar.
I forgot to answer it. oops.

I have never used MPASM. I should try and get it going

Just go here... at the bottom of the page, install the MPLAB IDE v8.00 Full Release Zipped Installation
http://www.microchip.com/stellent/id...&part=SW007002

Are you using MicroCode Studio for the IDE?
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[mister_e]

one of the less neat prototype i've never ever saw ...
http://www.botmag.com/articles/bionic_stamp.shtml

[wildbilly]

Hi Darrel. I am using Microcode Studio.

[Darrel Taylor]

Great. That makes it easy.

After installing MPLAB ...

In MCS, go to the View | Compile and Program Options | Assembler Tab

Click the Find Manually ... button and point it to
C:\program files\microchip\mpasm suite

Then check the Use MPASM checkbox.

You should be good to go.
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