Flex_lcd question.....

[Guest]

Hi,

I'm using the flex_lcd4x20.c driver in a project. I'd like to be able to 'scroll' the display up when I reach the end of the last line. To do this, I envision reading the characters of line 2 and writing them to line 1, reading the characters of line 3 and writing them to line 2, etc., etc. To do this, I need a function that can read the current value of each character on a line. I see that there is a function called lcd_read_byte in the driver, but it doesn't have an address argument, so I'm not sure what value it actually returns when it's used?

Dave

[PCM programmer]

You could use the lcd_getc() function to do this. But why read the LCD ?
That's very time-consuming. Instead, keep the lcd text data in a
2-dimensional array in the PIC. Then to scroll the LCD, start writing
to the LCD from the next line down in the array.

[Guest]

Hi PCM,

I thought about doing that but I'm not sure if I have the available RAM. I'll have to check.

I'm confused, why a 2 dimensinal array? I was thinking of something like this to hold the data for lines 2 to 4:

[PCM programmer]

That is a two dimensional array.
http://www.eskimo.com/~scs/cclass/int/sx9.html

[Guest]

PCM,

Errr, yes, of course it is! Sorry, just a brain freeze on my part. I honestly don't know what I was thinking :-)!

Dave