Need help crosscompiling SDL-LIB

Hello, 
i am trying to crosscompile the SDL-LIB for the mini2440:

i have used the following commands:

export ARCH=arm
export CROSS_COMPILE=arm-linux-
export PATH=......
export HOST=arm-linux

in the SDL dir i have typed:

./confiure --host=arm-linux

everything runs trough ... but:

make says:
ERROR SDL_dmaaudio.c in function 'DMA_WaitAudio'
error: impossible constrsint in 'asm'

--------------------------------------------------------------

Can anyone help me crosscompiling the SDL lib for my mini2440 (3,5" NEC
display)

Yours Andreas

Someone an idea how can i get it working?

Yours Andreas

You have to disable the audio subsystem.

.... configure .... --disable-audio.

The reason is, sdl's audio subsystem is written with some cpu-specific
assembler code which can't be used for ARM.

AFAIK there's a "real" ARM port of SDL, but i can't remember nor find it...

Thx, I got it... was quite simple .. i had to disabled X11 support, esd
audio, jack audio .. and a few other things.
I have used ALSA Audio wich is working.
I have also managed to get my touch screen working within sdl.

I am happy for now. Now i can start programming SDL programs.
b.t.w. all the SDL testprograms compiled fine but i had to remove the GL
relevant tests.

Yours Andreas

Hi Andreas
Can you post you configure script for SDL .

regards
--fatbrain

Yes of course....

i will post it this evening.

CU Andreas

./configure --host=arm-linux --prefix=/usr --sysconfdir=/etc --libdir=/lib
--datadir=/usr/share --disable-video-x11 --disable-alsatest
--disable-esdtest --disable-arts LDFLAGS="-L/rootfs/lib"
CPPFLAGS="-I/rootfs/usr/include" --disable-esd


You can also visit:

http://cchia-cwp.blogspot.com/

b.t.w. if you have trouble with the ts lib ....

export LD_LIBRARY_PATH=/lib:/usr/local/lib
and make a node (mknode) /dev/input/ts  

i am using the default qtopia image...
wich some modification on the rcS file
thats all.....
make shure you have already calibrated the touch...
and you should set an SDL-mouse driver (its a environmant variable too)
wich tells SDL witch mouse type you use....
thats all....

forget the node /dev...../ts

here is the better solution:

export TSLIB_TSDEVICE=/dev/input/event0
export SDL_MOUSEDEV=$TSLIB_TSDEVICE
export SDL_MOUSEDRV=TSLIB

Andreas:

I was able to build SDL for ARM9, I'm using a similar board but not 100%
compatible with FriendlyArm.
When I try to run the 'stars' demo program (witch I was able to compile and
link) it returns "SDL can't find the mouse".
I don't want to run my software over qtopia, so I am using the serial port
terminal.

I already checked tslib and ts_calibrate works fine.

Do you know what can be wrong?

Regards,
Luiz

Did you check your TS_LIB enviroment variabeles and your LD_LIBRARY_PATH?

I am not shure but you must compile SDL against the TS_LIB but maybe i am
wrong....

In my case the correct environment variables did the job

Yours Andreas

Andreas: 

I was able to compile SDL against ts_lib. Now I can run the soft, but the
mouse pointer is behaving strangely: When I press the touchscreen, it
'flies' randomly around the screen.

Any idea?

Hi, nice to hear that....

may you please also post me your SDL-LIB ./configure line?

I asume you have not correctly calibrated your touchscreen..
or the enviroment varialbe for the cal file is wrong......

Yours Andreas

Andreas:

I'm trying t use the SDL and tslib already found on the board /lib. I think
I messed up with something when cross-compiled SD, since when I link to it
I get a "illegal instruction" error. But it runs using the 'original' SDL.


on ts.conf I have:

module_raw input
module pthres pmin=1
module variance delta=30
module dejitter delta=100
module linear


The environment variables are set to:

TSLIB_CONSOLEDEVICE=none
TSLIB_FBDEVICE=/dev/fb0
TSLIB_TSDEVICE=/dev/event0
TSLIB_CALIBFILE=/etc/pointercal
TSLIB_CONFFILE=/etc/ts.conf
TSLIB_PLUGINDIR=/lib/ts

SDL_MOUSEDRV=TSLIB
SDL_MOUSEDEV=/dev/event0
SDL_NOMOUSE=1
SDL_FBDEV=/dev/fb0
SDL_VIDEODRIVER=fbcon

ts_calibrate works perfectly.

On my test program, I run this on an infinite loop:

int x,y;
while(SDL_PollEvent(&event))
{
    switch (event.type)
    {
        case SDL_MOUSEMOTION:
            SDL_GetMouseState(&x, &y);
            printf("Mx: %i - My: %i\n", x, y);
            break;
    }
}

When I press the touchscreen, it prints a list of xy coordinates with
apparently random pair of numbers - but inside the 320x240 range of the
display resolution.

Regards,
Luiz

If you still have the issue with SDL and tslib i just had this problem and
figured it out.
1. SDL must be built after tslib. If the build process was building things
in parallel and SDL's configure stage happened before tslib was built -
then SDL doesn't report correct touchscreen presses.
2. The tsib support for SDL depends on a configuration file /etc/fb.modes
to read the framebuffer settings for the current LCD. You can generate this
by running this command through the console.
fbset > /etc/fb.modes
3. The environment variables for this are in profile.environment. Only
these two need to be added to it (or before your application is called)
export SDL_MOUSEDRV=TSLIB
export SDL_MOUSEDEV=$TSLIB_TSDEVICE

Hi, 

I was able to cross compile the library. I have another question to ask. Is
the library needed just on the host linux computer at the time of
compilation or it has to be installed on the mini 2440 too? 

If it needs to be installed on mini2440 I guess I will have to copy couple
of files on 2440. If I am correct what all files I will have to copy to
mini 2440? 

Thanks in advance!