DLP programming for control of micro-mirror array

Alonzo,

Welcome to the TI DLP&MEMS E2E forum.

You have already found the two most helpful documents - http://www.ti.com/litv/pdf/dlpu002a and http://www.ti.com/litv/pdf/dlpa021a - the Programmer's Guide and the Structured Light App Report. There have also been a lot of questions asked and answers given on this forum. Search, or browse the forum.

Also, there are lots of resources (forums, websites, etc.) about the BeagleBoard which can be very helpful.

Perhaps others on the forum who have already climbed up the learning curve will be willing to share some tips with you.

Best regards,

Pascal

Thank you very much, I will definitely search around some more and see if I can dig up more information.

Actually I have a few questions.  I have installed Angstrom v2012.05 Kernel 3.0.17 and I have ran an opkg update and opkg upgrade.

when I type in 

root@beagleboard:/dev# uname -a

I get:  Linux beagleboard 3.0.17+ #1 Wed Jan 25 16:33:50 CET 2012 armv71 GNU/Linux

and when I check for the i2c 

root@beagleboard:/dev# ls i2c*

I get: i2c-1 i2c-3

so when I type in a command for the pico kit v2 like 

root@beagleboard:/dev# bus3-i2c 0x1b wb4 0x04 0x00000001

all that is returned is: -sh: bus3-i2c: command not found

I have tried reading multiple forums and posts, but I am still confused on what is going wrong.

Alonzo,

Are you sure that you have installed i2c-tools ?

See: http://www.lm-sensors.org/wiki/I2CTools

However, you will need to install the package for Angstrom Linux.

If it is already installed, do you have /usr/bin in your path? The command is located at /usr/bin/bus3-i2c

Best regards,

Pascal

Right so I tried looking and looking around and couldn't solve my situation, so I decided to start over.

So I have a Beagleboard Rev C4

I got a 4gb SD, and I partitioned the SD properly

as for the files I put in

I put in the first partition

MLO   

u-boot.img 

uImage 

Then in the second partition I put in

Angstrom-Beagleboard-demo-image-glibc-ipk-2011.1-beagleboard.rootfs.tar.bz2  

and properly untar the image as well as delete the .tar.bz2 file

Then I inserted my SD card into the BB and angstrom loaded up properly.  I opened up terminal and typed in

>> opkg update

>> opkg install i2c-tools

>> opkg install i2c-tools-dev

I still cannot access bus3-i2c comands from terminal.

Did I do something wrong?  I need the bus3-i2c terminal control so I can control my pico dlp projector kit

Ah yes thank you very much, this solved everything now.  I truly appreciate the helpfulness and speed on answering this question.

Alonzo,

That's great to hear.

I hope your your development/evaluation with the Pico Kit v2 goes well. If you have further questions or problems, please ask.

Best regards,

Pascal

Hello it is me again, I want to setup an external pattern, specifically 8-bit monochrome.  We I want to do eventually is get my own patterns sent through.

1) Now for the setup would this shell script work:

# setting up external pattern
bus3-i2c 0x1b wb4 0x04 0x00000000 # Select Parallel RGB input source
bus3-i2c 0x1b wb4 0x05 0x00000007 # VGA landscape
bus3-i2c 0x1b wb4 0x24 0x00000001 # External vertical sync

# Reduce LED current to about 350mA
bus3-i2c 0x1b wb4 0x0E 0x00000287 # Red
bus3-i2c 0x1b wb4 0x0F 0x00000287 # Green
bus3-i2c 0x1b wb4 0x10 0x00000287 # Blue

# Disable non-linear pixel processing
bus3-i2c 0x1b wb4 0x82 0x00000006 # Automatic Gain Control off
bus3-i2c 0x1b wb4 0x92 0x00000000 # Color Coordinate adjustment off
bus3-i2c 0x1b wb4 0x26 0x00000000 # Video/graphics enhancements off
bus3-i2c 0x1b wb4 0x62 0x00000000 # Non-linear processing inhibit

# Display Mode select
bus3-i2c 0x1b wb4 0x1F 0x00000004 # 8-bit monchrome

2) And from there what would be a good way to start getting different patterns setup?

2) For the patterns I was thinking of using python to get the specific patterns I wanted, does that sound right?

I'd suggest using processing.org as to create your patterns. We have done a with realtime 1440 fps mode on the pico 2, and have written software using processing, which naturally lends itself to this kind of thing.

Its based around java, and there are lots of example of how to manipulate color values for pixels which is very important.

For 1440 fps mode, we have an array of bit masks, which we cycle though and use the logical &s to combine them together to create 'colorspace multiplexed' values for each pixel. Its sounds complcated, but it actaully quite simple.

There are thousands of example programs for processing on the web and lots of libraries for differnent types of input/output methods.

Have fun.

Though now I have ran into another problem.  The Angstrom Demo, after I tried an opkg install pygame and pygtk and pycairo for certain imaging programs, when I tried to import pygame and the others I kept on getting an error that atexit module was missing, can anyone help me with that?

Alonzo,

Sorry for the long delay in responding. Did you find a resolution for your question?

I can not offer much help with this type of question. I suggest that you try a support group for Angstrom Distribution (http://www.angstrom-distribution.org/). Perhaps the Angstrom Users mailing list could be useful: http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/angstrom-distro-users

Also, Google searches could turn up others who have grappled with the same problems, and what they found as solutions.

Best regards,

Pascal