topic Re: Adding an external platform library to AOSP in i.MX Processors

Adding an external platform library to AOSP

imoya — Tue, 22 Sep 2020 11:55:08 GMT

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

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

Re: Adding an external platform library to AOSP

jamesbone — Tue, 22 Sep 2020 18:36:50 GMT

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

Re: Adding an external platform library to AOSP

imoya — Wed, 23 Sep 2020 11:57:39 GMT

@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

Re: Adding an external platform library to AOSP

jamesbone — Wed, 23 Sep 2020 15:34:30 GMT

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?

Re: Adding an external platform library to AOSP

imoya — Wed, 23 Sep 2020 16:13:24 GMT

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!

Re: Adding an external platform library to AOSP

imoya — Wed, 30 Sep 2020 11:12:59 GMT

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.