Using Nokia LCD

[Gusse]

Vop is a register in extended instruction set (see page 14, Set Vop)
http://www.nxp.com/acrobat_download2.../PCD8544_1.pdf

"8.9 Set VOP value" (on page 16) describes how to calculate setting value.

Contrast is set in "Lcd_Init" section in LCD_3310 -file.

Lcd_Data= $c8: GOSUB Lcd_SendByte       ' SET LCD Vop (CONTRAST)

Here it seems to be $c8, with some older I have to use $d1 and other newer might need $bf. Try to change the value and check which is best with your display.

BR,
-Gusse-

[astanapane]

i have fixed the circuit from that page and work fine.

http://www.radiolocman.com/shem/sche....html?di=44132

he is using the following

LcdReg = %00100001 'LCD Extended Commands.
call PrintCtrlLcd
LcdReg = %10101001 'Set LCD Vop (Contrast).
call PrintCtrlLcd
LcdReg = %00000110 'Set Temp coefficent.
call PrintCtrlLcd
LcdReg = %00010011 'LCD bias mode 1:48.
call PrintCtrlLcd
LcdReg = %00100000 'LCD Standard Commands, Horizontal addressing mode.
call PrintCtrlLcd

that means that the HEX of the Vop is $A9.

He is also says:

If by any chance the contrast isn't to your liking, it can be changed during the programming of Pic12F629, in the program location D2h. the current value A9h is the one I use with my LCD and don't know it will be for other LCDs. The value can be set to anything between 80 h and FFh, 80 h being minimum contrast and FFh maximum.

[mister_e]

OK, I've finished the new Include/driver/wrapper thing here. I'll post it in the next days. Still have some improvement to do. No big changes, but probably easier to use, a tad more flexible too.

You guys should love it

Stay tunned!

[astanapane]

hi mister_e

i'm looking forward to see it. Thanks.

[ruijc]

Hi all,

i've been looking at this topic for some time now.
I managed to get an original 3310 display and made some tests.

First i tried the INC solution but i got the "Truncated to code size" errors ( using 16F88 or 16F628A ).

Tried some examples posted here ( always changing ports to my configuration ) with a blank screen.

Tried the test file with big numbers and it worked.

Then moved to a 18F2550 micro-controller and once again the INC solution did not worked ( just had some ! simbols all over the place ).

The only solution i got was to use the INC file together with Gusse's sugestion on using "Gosub Lcd_SendChar" instead of "@ PrintStr" format.

This way works like a charm!

Do you guys know of an 18 pin chip that would work ( since it doesnt work with the 16Fs ) ?

Or Steve ( Mister-e ) will have a fresh new solution that will work on more chips ?

Regards

[mister_e]

My solution should work with anything, at compile time it decide which macro to build/compile/use.

It should even work with many 12F... with some limitations.

[mister_e]

Out of curiosity, which PIC didn't worked for you?

[ruijc]

Hi Steve

I was using the 16F88

Regards