Communication between AOSP JNI and HIDL

[msingh1920]

Hi Sir,

I am working on AOSP version 9.0 and using iMX8M Mini EVK development Kit and developing a android application which will use my custom system service to access HAL functionality.

I am able to create custom system service in AOSP framework and able to use it from from my Android App.

but while interfacing JNI layer and HIDL layer I am facing issue.

I am following below link for creating my custom HIDL and trying to access it from JNI layer -

https://devarea.com/android-hidl-and-project-treble/#.XZMirXUzY8o

and

https://www.jianshu.com/p/ca6823b897b5

I am also following the Light Example from AOSP to create my own custom HIDL and JNI layer.

AOSP File Path =>

JNI -> com_android_server_lights_LightsService.cpp         << framework/base/services/core/jni >>

HIDL -> Light.cpp / Light.h / ILight.Hal       << hardware/interfaces/light >> 

I am Successfully able to build the JNI layer and HIDL layer separately but i am not able to access HIDL from my JNI layer code. I am trying to use Binderized Mode as shown in above links and in AOSP Light Example. 

After successfully compiling the AOSP code when i try to run it on iMX8M EVK it is not booting and when i checked the logcat it is waiting for my HIDL service. Boot is getting stuck at android logo itself.

Please Suggest how can I use HIDL in Pass through or Binderized Mode and access it from my JNI code.

NOTE : I am referring above mentioned link and AOSP Light Example for creating my JNI and HIDL code.

Thanks,

Maneesh

[Janpk]

Hi @maneeshsingh192

Could you please share the code.

Thanks

[devendradevadig]

Dear Maneesh Singh,

I am leaning to write HAL, JNI and service in Android by using to Android 9 BSP using i.MX8M Mini board.

I am new to Android 9. Please can you share the example you tried on Android 9 BSP, so that will be helpful to me to understand HAL, JNI and Service by referring example  ? 

Thanks and Regards,

Devendra

[vinothkumars]

Hi maneeshsingh,

Will you please provide your implementation.

VinothS

[kumarijyoti9994]

Hi Vinoth,

We are trying to use CAN on imx8qxp board (Android Automotive 12.1.0_1.1.0) but we cannot see the CAN interface.

We have tried to update the flexcan in dts files. But we are getting following logs in kernel logs:

can_stby : disabling

can_en : disabling

Could you please support?

[msingh1920]

Hi Vinothkumar,

For JNI to work you need complete framework in place like system service, JNI, HIDL, HAL etc.

I am still working on it and will update you once I will made any progress.

Thanks,

Maneesh

[vinothkumars]

Thank you  Maneesh,

Which communication are you using for Vehicle HAL and Vehicle Driver and How you are verify the data pass from Vehicle Driver to HAL ?

Regards,

VinothS

[krishnan_ramesh]

Hi maneeshsingh vinothkumars,

I am looking at can communication from vehicle HAL up to the application layer in android automotive? Any idea about this?

Also, can u share implementation for the same?

Regards,

Ramesh

[vinothkumars]

Hi Ramesh

Share your mail Id and information about your board and android version.

Thanks,

Vinoth S,

[krishnan_ramesh]

Hi vinothkumars‌,

Thank you.

Working on Android 10 latest nxp automotive release on the IMX8 QXPMEK board.

Any open-source implementation and documents for this Share the links to this email id - shriyanayak1992@gmail.com

Regards,

Ramesh

[Janpk]

Hi Ramesh,

I am also looking into communication from vehicle HAL up to the application layer in android automotive?

Do you have any example code to start wtih.

Thanks

[diegoadrian]

Hello,

This question is more related to how the Android USB HAL interface with the Android framework. I highly suggest you to ask your question on the Google support page. They could help you and have a better understanding of this problem.

Community forum - Android Help  

I apologize for the inconvenience this could give you.

Best regards,

Diego.