Beagle Board to LCD how-to posted

GoogleGroups
1

Hello, Everyone,

Gerald had asked me to document bringing up and attaching a raw LCD
panel to the Beagle Board through a Digital View ALR-1400.

I just posted a first cut at the resulting documentation at:

http://elinux.org/BeagleBoard#Interfacing_to_Raw_LCD_Panels

I know there had been some discussion about adding the LCD lines to
the Expansion Port. This shows one alternative to that.

Please let me know if there are any questions that you have about the
above posting.

Thanks,

Keith
espian
'at'
linuxinstruments.com

2

espian wrote:

Hello, Everyone,

Gerald had asked me to document bringing up and attaching a raw LCD
panel to the Beagle Board through a Digital View ALR-1400.

I just posted a first cut at the resulting documentation at:

Beagleboard:Main Page - eLinux.org

I know there had been some discussion about adding the LCD lines to
the Expansion Port. This shows one alternative to that.

Please let me know if there are any questions that you have about the
above posting.

FYI just in case you missed it: dv added a discussion:

http://elinux.org/Talk:BeagleBoardRawLCD

Dirk

3

This is being addresssed on the Rev C version of the board.

Gerald

4

Hi Gerald,

That's great news. What specifically have you done on Rev C to address
support for raw LCDs?

Thanks,

Eric

5

We have brought out all of the LCD signals to a pair of headers. The DVI-D connector has been moved next to the S-Video connector to make room for these headers. The Expansion connector has remained the same. We don’t have a lot of room, but we were able to work it it.

Gerald

6

Attached is a mockup of what we are doing.

Gerald

Beagle_exp_LCD_RevC.JPG

7

Hey Gerald, any idea when Rev C boards will be out?
Thanks,
Albert

8

That looks pretty good. I imagine that bringing those signals out will
make some people pretty happy.

Too bad that the S-video connector is so enormous compared to the
number of signals it actually carries. Seems like the kind of thing
that's ripe for a reduced-size connector standard.

BTW - I've wondered about this: What is gained by putting the JTAG
connector on a diagonal like that? Is it just to shorten routes to the
SOC?

Eric

9

A lot of it depends on us finishing up our testing and the overall production scheduling. Right now it is looking like late December or early January.

Gerald

10

Yes, it was to shorten the line as much as possible. At 1.8V, the signals can have a tough time if they go too far to drive some of the JTAG devices out there. I always have used buffers on the JTAG, but we had no room on the board for the buffers.

Gerald