How to move data from array into LCD? (Using LCDOUT)

[HenrikOlsson]

Section 5.38, LCDOUT:

STR ArrayVar{\count} Send string of n characters

Then of course if you want to do it in the idealistic BASIC way

Graph[0] = $11
Graph[1] = $23
'and so on.
LCDOUT $FE, 1   'Clear the screen
For i = 0 to 7
  LCDOUT Graph[i]
NEXT

/Henrik.

[CuriousOne]

With LCDOUT, I don't want to put new characters on screen, I want to update LCD screen custom character RAM, so process of char redrawing will be shown as animation.

[HenrikOlsson]

What's the difference between writing to DDRAM and CGRAM? Instead of sending the clearscreen command as in the example, send the correct command to access CGRAM and then the data.

/Henrik.

[CuriousOne]

The question is in following. Say, first character RAM starts at $40. And this is address for top line, right? and address for next line is $41 ? I mean, if I do code, where $40 will be incremented by 1 in loop for 7 times, all lines will be written properly?

LCDOUT $FE, $40+A,

is such structure correct?

[HenrikOlsson]

The adress pointer in the 44780 is incremented automatically so if you set it to $40 and send 5 bytes of data they will end up at adress $40-$44 automatically. Just as they would when you write to the DDRAM, you (for example) clear the screen which sets the adress pointer to 0 (first char on first line). Each byte received from there on will end up at "the next" location, right? There's no difference in writing to CGRAM. So if you prefer your idealistic way over using the STR modifer

LCDOUT $FE, $40  ' Set adress pointer to first location of CGRAM
For i = 0 to 7        ' Send 8 bytes of CG data
  LCDOUT Graph[i]
NEXT

At least give it a try and see if it does what you're asking.

/Henrik.

[CuriousOne]

The problem is, that I want sent data byte by byte, not all together, but with small delay.

[CuriousOne]

I mean, I want to send one byte into 1st line of 1st char, then send 1 byte into 1st line of 2nd char and so on.

[CuriousOne]

So say this code:

LCDOUT $FE, $40,$12
LCDOUT $FE, $48,$15

Will send $12 to 1st line of 1st char and $15 to 1st line of 2nd char, but if I call the LCDOUT $FE, $40, $12 again, it will be written into 2nd line of 1st char, right?