Is it a monochrome display/mode?

Here is what it sounds like to me:

Byte 0 of display RAM is 8 pixels, 0,0 to 0,7, byte 1 is 1,0 to 1,7, etc.
Drawing a line from 0,0 to 0,240 sets bytes 0 to 239 to 0x01
Drawing a line from 1,0 to 1,240 sets bytes 0 to 239 to 0x02, erasing=20
the first line.
Drawing a line from 2,0 to 2,240 sets bytes 0 to 239 to 0x04, erasing=20
the second line.
..
..
Drawing a line from 7,0 to 7,240 sets bytes 0 to 239 to 0x80, erasing=20
the seventh line.
Drawing a line from 8,0 to 8,240 sets bytes 240 to 479 to 0x01, leaving=20
the eighth line intact.
etc.

Kerry



Mark Hanchey wrote:
> I have a 320x240 glcd with an epson s1d13700 display controller that is=20
> paired with a 18lf45k200 chip. The problem I am having is that whatever=20
> I display graphically only shows every 7/8th pixel. If I draw pixels=20
> using a loop in the code to draw from 0,0 to 0,240 and increment that to=
=20
> 1,0 to 1,240 so that it forms lines on the display ,the lines are drawn=20
> properly but the only lines on the display are every 8th row. I can see=20
> the lines being drawn on the display but it looks like they are being=20
> erased as soon as they are drawn , except for every 8th row.
>
> I tried different libraries, so far it does the same thing whether I use=
=20
> swordfish basic, CCS, or Microchip c18. This was using sample code I=20
> found on the net and not code I wrote myself so I can't see how code can=
=20
> be the problem.
>
> More what I am focusing on is the 18LF45k22 chip is running off a 3V=20
> supply and the display is running off 5.0V supply. I'm wondering if=20
> there  might be some problems with logic levels or maybe it is a timing=20
> issue with this specific pic chip. I 'm doubtful on the logic levels=20
> because the commands are clearly getting through to the display because=20
> it can display text and draws the lines, they just don't seem to remain=20
> on the display.
>
> Thanks
> Mark
>
>  =20

--=20
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