Thread: [lcd4linux] writing to DDRAm

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Hi!
How can you actually write to the LCD's DDRAM so that you won't have to
write one character at a time?

Thanks,
Carlos Luna

Hi Carlos,

> How can you actually write to the LCD's DDRAM so that you won't have to
> write one character at a time?

You have to be more specific:

- what kind of display are you talking about? Which driver are you using?

- I think there's not much difference in sending one character a time or 
writing one byte to the display RAM.

bye, Michael

-- 
netWorks                                          Vox: +43 316  698260
Michael Reinelt                                   Fax: +43 316  692343
Geisslergasse 4                                   GSM: +43 676 3079941
A-8045 Graz, Austria                          e-mail: re...@eu...

Hi Michael.

> - what kind of display are you talking about? Which driver are you using?
Sorry about the lack of info...
I have a PowerTip PC1602ARS, 16x2 lcd.
The driver I'm using is the HD44780(but with modifications)

> - I think there's not much difference in sending one character a time or 
> writing one byte to the display RAM.
That's great!  So can you give me some code?

Thanks
Carlos

----- Original Message ----- 
From: "Michael Reinelt" <re...@eu...>
To: "Carlos Luna" <car...@st...>
Cc: <lcd...@li...>
Sent: Thursday, August 29, 2002 8:49 AM
Subject: Re: [lcd4linux] writing to DDRAm

> Hi Carlos,
> 
> > How can you actually write to the LCD's DDRAM so that you won't have to
> > write one character at a time?
> 
> You have to be more specific:
> 
> 
> - I think there's not much difference in sending one character a time or 
> writing one byte to the display RAM.
> 
> 
> bye, Michael
> 
> -- 
> netWorks                                          Vox: +43 316  698260
> Michael Reinelt                                   Fax: +43 316  692343
> Geisslergasse 4                                   GSM: +43 676 3079941
> A-8045 Graz, Austria                          e-mail: re...@eu...
> 
> 
> 
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Hi Carlos,

> I have a PowerTip PC1602ARS, 16x2 lcd.
> The driver I'm using is the HD44780(but with modifications)

What did you modify? Does it make sense to put the code into the 
official distribution? Can I see the modifications?

>>- I think there's not much difference in sending one character a time or 
>>writing one byte to the display RAM.
> 
> That's great!  So can you give me some code?

No, I'm sorry. I just wanted to know why you would like to write to the 
display RAM (but there is some code inside of HD44780.c which writes 
into the CGRAM to create user-defined characters. I suppose writing to 
the display RAM is similar...)

bye, Michael

-- 
netWorks                                          Vox: +43 316  698260
Michael Reinelt                                   Fax: +43 316  692343
Geisslergasse 4                                   GSM: +43 676 3079941
A-8045 Graz, Austria                          e-mail: re...@eu...