On 18-Feb-09, at 11:18 AM, Ludwig wrote:
2009/2/18 Brian Code <[email protected]>
Hi Ludwig,
We could and would like to host any git projects that you've created
to help grow the community. Please let me know if you would like to
do that. I suppose the best way would be to send a tarball and I can
put it up in a git. Alternatively, if you create your own git, I
could pull from that.
Once again, nice work. I was wondering what was going to happen with
the USB host mode. It's quite unique to the Freerunner.
Thanks,
Brian
Hi Brian,
Here are three links to tarballs from the shared libraries I needed
to built to get gphoto running. Gmail apparently does not allow me
any more to send tgz files, so you can download them here:
http://www.yunnanexplorer.com/static/download/libpopt.tar.gz
http://www.yunnanexplorer.com/static/download/libregex.tar.gz
http://www.yunnanexplorer.com/static/download/libltdl.tar.gz
This is only the first instalment as I am cleaning up my build.
My own server is a bit asthmatic and not all that reliable, so it
would be better for Koolu to host it. Plus it keeps it all handily
together.
The tarballs each build a shared library and are meant to reside in
the external tree in the Android build. (Their root is at the top of
the android tree).
I have taken the following convention to make these: Android.mk in
the top level directory as required. Then under that is a directory
called android, which contains the config.h and other android build
specific files. This is to avoid anyone else to include the config.h
file and to keep this hand-crafted config.h separate from any
configure generated ones. I am not sure if this is the best
practice...let me know if there is a better convention and I can
change it. They are configured not to be in the prelink map, so no
other changes are required. (I am not really sure what the prelink
map really does, maybe it is a speed-up at runtime.)
libregex: this is actually the regex.c and regex.h already contained
in the external/clearsilver/utils folder (which does not build a
shared library on the device). Again not sure of best practice as
this duplicates the code, but if at all I think it should not live
under the clearsilver/utils...
libpopt:
libltdl: part of libtool, here as a separate shared library
The next ones to come would be libusb and libiconv, then the gphoto
builds. Whether all this should be part of a single git for external
libraries or be separate projects is up to you.
Ludwig
On 18-Feb-09, at 3:20 AM, Ludwig wrote:
I have just succeeded in running the gphoto application on my
Android Freerunner. Gphoto (http://gphoto.sourceforge.net/) talks
to my Nikon DSLR via USB (Android in hostmode), triggers the
release shutter and downloads the photo to the phone.
In addition to the instructions given by Andy in this thread there
were a number of other commands required to successfully put
Android in USB host mode:
The first were to make the two files required for host mode to be
made writeable. At the moment I issue the following commands:
adb shell mount -o rw,remount rootfs /
adb shell chmod 666 /sys/class/i2c-adapter/i2c-0/0-0073/neo1973-pm-
host.0/hostmode
adb shell chmod 666 /sys/devices/platform/s3c2410-ohci/usb_mode
This should of course go into init.rc for production systems.
The second is to mount the usb file system with:
adb shell mount -t usbfs none /proc/bus/usb
At the moment I am at the state where I have a gphoto2 executable
that I can start from the Terminal Emulator, so this is not yet run
from within an Android app. Apart from not yet having written a JNI
wrapper, I have the issue that reading from the usb file system
requires the application to be root. I have hacked this at the
moment by making my gphoto2 executable suid root. Is there a way to
make this readable/writable by others (the problem is that while
tethered to the computer the file system is empty and once
connected to the camera I do not have a root shell any more)?
There were a number of things that I had to do to make this work
that I would like to share, like compiling a number of external
libraries:
libusb as a shared library
compiling ltdl into a shared library for portable shared library
loading
libiconv
regex as a shared library
plus of course gphoto2 as well.
The majority of this work was to write the Android.mk files and to
have suitable config.h files. What is the best way of sharing this?
Ludwig
| I would like to port the ghoto2 application, which talks to all
sorts of
| digital cameras over USB, to Android. It is a C library, for
which a JNI
| interface would have to be written so that it could be called
from an
| Android application. Someone else has done this (unfortunately
without
| releasing the code) for another distribution on the
| freerunner: http://0x2a-blog.org/?p=49. <http://0x2a-blog.org/?
p=49>
|
| The first hurdle is of course that this needs to put the
freerunner into
| USB host mode. The wiki says this is TBD.
|
| I do not really know much about this. What is the state of this
and what
| would need to be done on it? Is this for any reason a non-starter?
| All pointers welcome.
No it's pretty easy, you just need to cat to a couple of /sys nodes
echo 1 > /sys/class/i2c-adapter/i2c-0/0-0073/neo1973-pm-host.0/
hostmode
echo host > /sys/devices/platform/s3c2410-ohci/usb_mode
put 0 and "device" there instead to switch it back.
- -Andy
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