6-font or 8-font for a T6963C Graphic LCD

[John Leung]

Hi PIC users

I am working on a simple display driver for T6963C Graphic LCD in 128x64 matrix. I am puzzled with the fact that when the LCD is set in 6-font mode, I need to set either 21 columns or 22 columns to clear the LCD screen. A simple multiplication shows, 21x6 = 126, 22x6=132.

If I choose 21 columns, there will be 2 dots at the right hand side of the physical screen dots not covered. I could have set the columns to be 22, but I would "over-shot" a little bit by 132 dots horizontal, which is larger than the physical screen size of 128 dots.

Of course, if I set everything in 8-font, the screen will be in 16 Columns, but the ASC characters built-in just in 5x7 fonts, so 8-font setting seems a little bit strange.

Any suggestion to solve the problem? Any trick that I have missed?

John Leung

[newguy]

A 5x7 font is 5 pixels wide by 7 pixels tall. If you set the 6963 to a 6 pixel wide font, then you'll get 22 columns of text across the screen. If you set the controller to an 8 pixel wide font, then you'll get 16 columns of text across the screen. The actual letters themselves will still be 5x7 pixels each, but on the 8 pixel setting, there will be a more noticeable space of 3 pixels between each letter.

Look at the code library. I posted some t6963c drivers there a while ago.

[treitmey]

I found this in my library. I think it is right. Can someone checkit. It may make more sense to you now.
/////////////////////////////////////////////////
//FS=0, 5x7 char in 8x8 field, 30char/line, 240 char total,graphic pics 8pixels/address, 0x780 grh addresses
//FS=1, 5x7 char in 6x8 field, 40char/line, 320 char total,graphic pics 6pixels/address, 0xA00 grh addresses
// - - - - 64K RAM - - - - 0 to 0xFFFF
// 0 grh home
// ...
// grh end (right before txt home)
// 0x780----(screen 0) or 0xA00 Txt home depends on FS
// 0x870----(screen 1) adding 240 for each screen
// 0x960----(screen 2)
// 0xA50----(screen 3)
//////////////////////////////////////////////

[ALPOO]