Hello Mikkel,
"Make sure that you have given the right write permissions to the LED
sysfs entry. This can be done in your init.rc file."
Can you elaborate on this a bit more please? I am trying to edit my init.rc
file but there are so many sections e.g. on boot.
Where would I insert the
On Jan 2, 3:31 pm, A Curtis ajcurti...@gmail.com wrote:
On second thought there is a difference,
The problem isn't just a sequence of instructions but having
sufficient permission to execute. The Java JVM does not run as root.
So,you need something that runs as root to change permissions to
On Jan 2, 3:31 pm, A Curtis ajcurti...@gmail.com wrote:
On second thought there is a difference,
The problem isn't just a sequence of instructions but having
sufficient permission to execute. The Java JVM does not run as root.
echo isn't setuid root either
So,you need something that runs as
The point was to proviide a simple short example of how to export GPIO
for access from Java. Of course the could have been done in Java but
it would be more then 3 lines of code.
On Jan 1, 7:13 pm, Chris Stratton cs07...@gmail.com wrote:
On Dec 30 2010, 12:19 pm, A Curtis ajcurti...@gmail.com
On second thought there is a difference,
The problem isn't just a sequence of instructions but having
sufficient permission to execute. The Java JVM does not run as root.
So,you need something that runs as root to change permissions to
enable Java access.
IMO a script maybe the best solution
On Dec 30 2010, 12:19 pm, A Curtis ajcurti...@gmail.com wrote:
This is basically what I did to access a GPIO from Java land.
echo 128 /sys/class/gpio/export
echo out /sys/devices/virtual/gpio/gpio128/direction
chmod 0666 /sys/devices/virtual/gpio/gpio128/value
Just FYI, that's not
I got this working!
Basically I did not realize that SYSFS was more sophisticated than /
proc and actually supported file permissions.
This is basically what I did to access a GPIO from Java land.
echo 128 /sys/class/gpio/export
echo out /sys/devices/virtual/gpio/gpio128/direction
chmod 0666
This of course opens up security holes.
On Thu, Dec 30, 2010 at 9:19 AM, A Curtis ajcurti...@gmail.com wrote:
I got this working!
Basically I did not realize that SYSFS was more sophisticated than /
proc and actually supported file permissions.
This is basically what I did to access a GPIO
Chris,
Have you tried to access sysfs directly frdom Java? I have not been
able to get this to work.
Could you provide a code fragment?
TIA
On Nov 23, 10:12 am, Chris Stratton cs07...@gmail.com wrote:
On Nov 23, 5:33 am, Mikkel Christensen mikkel.christen...@ixonos.com
wrote:
If the LED
I want to use:
pmic_secure_mpp_config_i_sink() which is defined in kernel/arch/arm/
mach-msm/pmic.c
It should be faster as there would be less overhead. If it's not fast
enough, then I would just move most of the code down to the AMSS side
and create my own RPC call that would just pass the data
Yes, I have the right coupling from the app to the native code. Yes,
I found out about using the sysfs entry. The problem is that
interface is too slow. I believe that I need to send an RPC call
directly to the hardware layer, and that interface is already defined,
but I can't figure out how to
Can you post the definition of the interface you want to talk to?
Do you have any actual evidence that using this other interface will
be faster?
(Often the way to speed things up when the interface itself is slow is
to hand off larger units of work at a time)
On Nov 24, 2:10 pm, jon.schell
Hello,
I would use the SimpleJNI sample application [1] as a base reference.
This does the right coupling from Android application to your lower
level hardware interface.
If the LED is already exposed in sysfs you are lucky and it should be
quite easy. Otherwise create a Kernel device driver
On Nov 23, 5:33 am, Mikkel Christensen mikkel.christen...@ixonos.com
wrote:
If the LED is already exposed in sysfs you are lucky and it should be
quite easy. Otherwise create a Kernel device driver that does the
exposure of the LED to sysfs.
If it's already exposed in sysfs, you don't need to
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