Topic: Raspberry Pi (and other tiny Linux computers)

[James]

Hey everyone! Check it out!

http://laserboy.org/code/LaserBoy_2013_04_14.zip

http://laserboy.org/code/LaserBoy_2013_04_16.zip

This latest version of LaserBoy has been specifically reworked to compile and run on the Raspberry Pi!

It comes with instructions for the adventurous.

I fixed a lot of weird color issues that now make it look perfect in 16 bit packed pixel video (default video mode for Xfree86 on the Pi). These fixes should also resolves some issues for Mac OSX, that I could not see any other way.

Please check it out (both Pi and Mac users) and let me know how it goes.

Now I have a lot of more work to do to try to get the USB SND8 sound device (LaserBoy DAC) to work on the Pi. Future plans are to write a web interface so that the Pi can be a headless laser projector control device.

James.

[James]

Oops!

In my efforts to get the color stuff working properly, I broke something to do with palette indexes.

So this version fixes that issue.

http://laserboy.org/code/LaserBoy_2013_04_16.zip

Sorry for the inconvenience.

James. 

[James]

Even better!

http://laserboy.org/code/LaserBoy_2013_05_01.zip

This version has been thoroughly tested and proven to work in the console!

It works in any bits-per-pixel frame buffer; even 8 bit palette mode!

James. 

[James]

I just tried to compile LB on my Raspberry Pi with RASPBIAN Debian Wheezy Version:February 2015 Release date:2015-02-16.

And I get the following linker error:

undefined reference to symbol 'pthread_getspecific@@glibc_2.4' //lib/arm-linux-gnueabihf/libpthread.so.0: error adding symbols: dso missing from command line

So I opened Makefile in src and changed this line:

LIBS = -lSDL -lboost_system -lboost_filesystem

by adding -lpthread to the end like this:
 
LIBS = -lSDL -lboost_system -lboost_filesystem -lpthread

Now it compiles and links.

I also noticed that the red and blue bytes are swapped in the video display so I commented out the last several lines of LaserBoy_macros.hpp

Code: [Select]

/*
#if defined __arm__ // Raspberry Pi 32 bit frame buffer
#undef     ALPHA_BIT_SHIFT
#undef     RED_BIT_SHIFT
#undef     GREEN_BIT_SHIFT
#undef     BLUE_BIT_SHIFT
#define    ALPHA_BIT_SHIFT                         24
#define    RED_BIT_SHIFT                            0
#define    GREEN_BIT_SHIFT                          8
#define    BLUE_BIT_SHIFT                          16
#endif
*/

James.

[BlinkenLights]

I can confirm this solution
I had to do the same thing on a LinuxMint machine
was then able to compile and get it working

[emanuel]

LIBS = -lSDL -lboost_system -lboost_filesystem -lpthreadNow it compiles and links.

I've just compiled LB for mips little edian hard float (dreambox dm7080/dm820) workes well on 1280x720 (SDL/directfb).


But I had got the same issues building for amd64 arch, while using the "make -j 8". I hat to compile 3 times to come to "strip".


I think this issues comes from multitask compiling. So one compiling task is faster then the other. For pc build I just can use "make".


But for dreambox I build it in Openembedded env, using multitask compiling as a default.