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 commands?
I am assuming I have to insert "write sysfs/gpio/export xxx" or something
similar.
Thanks
Jerry
On Tuesday, November 23, 2010 at 12:33:19 PM UTC+2, Mikkel Christensen
wrote:
>
> 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 that does the
> exposure of the LED to sysfs.
>
> Then in the /jni/native.cpp function do the proper write to the sysfs
> entry like this (note: this depends on how the led is exposed trough
> sysfs):
>
> ret = system("echo 1 > /sys/class/leds/red/brightness");
>
> Make sure that you have given the right write permissions to the LED
> sysfs entry. This can be done in your init.rc file.
>
> Best regards,
> Mikkel Christensen
>
> [1]
> http://android.git.kernel.org/?p=platform/development.git;a=tree;f=samples/SimpleJNI
>
>
> On Nov 17, 12:10 am, "jon.schell" <[email protected]> wrote:
> > I am trying to create a simple app for testing that will toggle an LED
> > on the phone as needed. I have the NDK set up and my c code compiles,
> > but I don't know how to link it to the actual hardware function that
> > would set the LED. I'm using the actual source code for the hardware,
> > it's not in an exposed library. Do I need to create a static library
> > for it to use? Would it maybe be easier to add an android API for
> > this somehow rather than using the NDK?
> >
> > For reference, this is Android 2.1 on a Qualcomm MSM7627.
> >
> > Jonathan
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