LCD Control

[boboco]

Hi All,

I use PBP.

I know this must be an old hat, but I've been trying this one for days. I'm using a Displaytech 162 LCD 2 x 16 on a PIC16F877 port d and, do what I will, I can't get it to write the second line. I've tried all sorts of DEFINES etc. without success.

If I define the display as one line, which I still suppose it to be, first line is normal, second line nothing. If I define the device as 2 line, however, I get no display at all.

Second line adress is given as 40H, but I've tried almost anything to no purpose.

I've driven lots of LCDs with lots of PICs and had some problems, but this is new to me. Or is the display most probably defect?

[mister_e]

Can you provide any datasheet for us? sometime we feel lazy to search... at least me

[Luciano]

Hi,

Add 80h to the character address to make
the Display Data RAM Address Set command.
(When you add 80h you set bit 7).


$00 + $80 = $80
$40 + $80 = $c0

LCDOUT $FE,$80, "Hello on line 1"
LCDOUT $FE,$C0, "Hello on line 2"

Best regards,

Luciano

[boboco]

Hi Luciano, Hi Mister_e,

I have already tried the code as you write, Luciano, it doesn't work on this unit but thanks all the same.

If the unit isn't defect I'm wondering if the display controller chip is non-compatible to the Hitachi, it's a KS0070 but I believe it to be OK. I've got the data sheet in PDF and can send it to you if you require it, Mister_e. Checking through the command and address register it seems to be similar to the Hitachi controller. I'm beat.

[mister_e]

well, post your PDF here or the link to get it.

[boboco]

Hi Steve,

attached the PDF. Maybe you can find something. Thanks for the effort.

Greetings,

Rob