Adding an external platform library to AOSP

[imoya]

I'm trying to add an external library to my AOSP (v9.0.0-2.0.0) image by following the instructions provided with said library. The instructions are:

cd <aosp source folder>/external/libgpiod

mm

Then I run luch and then make to build the image then I flashed it to the SD card. But when I the library commands it via adb shell, none of them work. Although I can see that there are some files name the same as the library in the /out folder.

Is there any way to debug this? The log file isn't helping me very much.

The library in question is https://github.com/technexion-android/platform_external_libgpiod

[imoya]

Thank you James,

yes the library was already included but that wasn't the case for the command-line tools of libgpiod, that was the reason why the commands didn't work.

[imoya]

@jamesbonethanks for your feedback. I think there is something I am not understanding from this library.

When I try anyone of the shell commands none of them work. I get this output:

dart_mx8mm:/ # gpiodetect
/system/bin/sh: gpiodetect: not found

And its the same for the rest of them, gpioinfo, gpioget, gpioset, gpiofind and gpiomon. If it is already installed, shouldn't they work?

Thanks again,

best regards

[jamesbone]

I think you need to contact Varicite, the board Manufacturer, in order to understand if the BSP has something else in the Kernel or in the rc file,  that need to be configure to use in the command shell the library.

Have you try to use it in an APK or in a program?

[imoya]

Yes, I'm already in touch with them, but because of holidays in Israel I haven't got a reply yet.

I'm doing as you advised right know. I will post my results here.

Thanks!

[jamesbone · Accepted solution]

Que tal @imoya ,

You do not need to add this library, it is already in the Android BSP of the board that you have, it is not necessary,  If you add a new library then need to be reported to the Android System, besides the Linux Kernel of the system.  some  kind of security features.

Hope this helps