| Author |
Topic |
|
|
davidjstewart
8 Posts |
 Posted - 04 Apr 2003 : 17:57:09
|
In the Bitsy Plus user manual it indicates that the J1 pinout for the video signal output is for 16bpp mode. It references a table for other color depths, although that table does not appear to be in the document.
I specifically need to determine the pinout for 8bpp for the LQ64D343.
I also have a problem with the screen overlapping left to right. The left 1 inch of the display wraps around to the other side of the display. Is this a cable issue?
Thanks,
Dave Stewart |
|
|
akidder
1519 Posts |
Posted - 04 Apr 2003 : 18:31:41
|
Hi Dave. Good questions. Take a look at this drawing for the 12 bpp cable we recommend for use with the LQ64D343 and similar displays. It should give you a pretty good picture of how we map the signals.
Note that the StrongARM is going to give you 12 bit color from an 8 bpp (256 entry) palette. We use 8 and 12 bpp interchangeably when speaking of these systems.
As for your overlap, it probably means that you are hooking up a panel with different display timings from the LQ64D343. Drop us a line and let us know what display you're using. We can get you the driver settings that work best with your display.
Cheers,
Drew |
 |
|
|
davidjstewart
8 Posts |
Posted - 04 Apr 2003 : 19:46:20
|
Drew,
Thank you for the quick response. I will dig into the cable drawing.
As far as the panel, I am using a Sharp LQ64D343, so i'm not sure what might be the problem. When set to 16bpp everything looks great, except for the wrap-around. This is happening both with an older Bitsy Plus board from an eval kit we bought last year, as well as the new bitsy plus's we just received from you this week. (CE 3, not .net)
The boards do work properly in 8bpp with the eval kit connector board and display. In our implementation we have built our own connector board which routes the video signal through the circuit board to a connector near the edge of the board. A 3 inch cable then makes the connection to the sharp display.
Thanks for the help,
Dave |
|
|
|
davidjstewart
8 Posts |
Posted - 07 Apr 2003 : 12:28:12
|
Drew,
After digging into the cable drawing some more, I think I have a good understanding of what signals have been moved to different pins, helping me better understand how to build our cable. One question I have however is that in the 12bpp drawing you provided, it indicates it is a replacement for the ADS 610110-3008 display cable that you provide. In the drawing it indicates that some signals must be split to feed two inputs on the LCD panel (ie R0 feeds both R0 and R2 on the display.) However, when looking at the 610110-3008 cable, i see no signals being split. Does this mean that it is not necessary to do so? Also it seems that the mappings are not right between the above mentioned cable and the drawing provided.
Thanks,
Dave |
|
|
|
davidjstewart
8 Posts |
Posted - 08 Apr 2003 : 16:36:57
|
Drew,
Good News, the video wrap around problem is solved. The Panel_Enable rather than the LBIAS (data enable) signal had been routed to the display enable signal . It appears to be working properly now.
THanks,
Dave |
|
|
| |
Topic |
|
|
|
All Forums
Hardware
8bpp on Bitsy Plus
Forum Locked
Send Topic to a Friend
Printer Friendly