How to install an example flutter app to STM32MP157F-DK2

Gencay · ‎2022-08-09

I`ve built st-image-weston for stm32mp157f-disco board with flutter and clang layer. Then I built SDK with:

bitbake core-image-weston -c populate_sdk

Then I installed SDK with

.tmp/deploy/sdk/core-image-weston-openstlinux-weston-stm32mp15-disco-x86_64-toolchain-4.0.1-snapshot.sh

After that I setup environment with

source /opt/st/stm32mp15-disco/4.0.1-snapshot/environment-setup-cortexa7t2hf-neon-vfpv4-ostl-linux-gnueabi
 
 
export CC=${CLANGCC}
 
export CXX=${CLANGCXX}

My question is how can I install a simple flutter app to my discovery board. What are the steps that I need to follow.

Joel · ‎2022-08-25

@Gencay This is not a simple answer.

First it depends on what image type you have (runtime=debug, runtime=release, runtime=profile).

My experience is that running a Flutter app via debug on the STM32MP157F-DK2 is very slow. So I would avoid that for now.

If you have a runtime=release image, then you have to create an AOT image.

The steps used by meta-flutter to generate an AOT (release - libapp.so) is located here:

https://github.com/meta-flutter/meta-flutter/blob/kirkstone/classes/flutter-app.bbclass#L170

If you install the flutter-engine-<runtime flavor>-sdk-dev package to image, you can scp the engine_sdk.zip from /usr/share/flutter/engine_sdk.zip. This has required gen_snapshot to generate an AOT image.

So once you have the libapp.so you create your bundle folder on target. This can be in /tmp or wherever you have write access to.

Create this folder structure on target. data/flutter_assets is from your host build/flutter_assets folder.

data

flutter_assets

lib

libapp.so

For DRM run:

`flutter-pi --release <bundle folder>`

For Wayland run:

`flutter-auto --w=1920 --h=720 --b=<bundle folder>

I may have missed something but that's the general flow. Feel free to start a discussion here so other meta-flutter users can benefit:

https://github.com/meta-flutter/meta-flutter/discussions

Cheers,

Joel

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Olivier GALLIEN · ‎2022-08-25

Hi @Gencay ,

@Community member (Kudos to him ! ) share his Flutter project for MP1 here in this community :

https://community.st.com/s/project/a8g3W000000fxV5QAI/google-flutter-for-stm32mp1

I'm quite sure this will help you

Olivier

Olivier GALLIEN
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Joel · ‎2022-08-25