STM32N6 + YOLOv8n ONNX Model. Issues with PNG Input and Code Generation

[TerZer]

Hi everyone,

I'm working with an STM32N6 board and trying to deploy a custom YOLOv8n model in ONNX format using CubeMX and STM32 Edge AI. I’ve run into a few issues and was hoping someone could help clarify the process.

Here’s what I’ve done so far:

I successfully imported my yolov8n.onnx model into CubeMX + Edge AI.

When I try to test the model using a .PNG image, I get an error saying PNG format is not supported. When I generate the C code using the model, I see a line in network.c where -inf is not defined, causing compilation errors.

My Questions:

How can I test my model using a PNG image, either on the STM32N6 device or on a desktop simulation?

Do I need to convert the PNG to raw input data manually?

What’s the correct way to prepare a PNG image as an input buffer for use with STM32 inference code?

How do I resolve the -inf not defined issue in the generated network.c?

Any help, code snippets, or documentation pointers would be greatly appreciated!

Thanks in advance!

[Julian E.]

@TerZer,

It should be ok next week.

Have a good day,

Julian

[Julian E. · Accepted solution]

Hello @TerZer,

You can find the tutorial here:

How to build an AI application from scratch on the... - STMicroelectronics Community

Have a good day,

Julian

[TerZer]

Hello @Julian E. ,

First off, thanks for your tutorial — it was really helpful! However, I ran into an issue. I tried to create a TouchGFX application, and when I attempted to add the X-CUBE-AI component in STM32CubeMX, I got the following message:

This component cannot be selected:

- This application cannot be selected while the application Application from pack STMicroelectronics.X-CUBE-TOUCHGFX.4.25.0 is selected.

Is there a known workaround or specific setup needed to use both X-CUBE-AI and TouchGFX in the same project?

P.S.
All software is on latest version:
X-CUBE-AI version 10.2.0

X-CUBE-TOUCHGFX 4.25.0

[Julian E.]

Hello @TerZer,

You are right, I am asking the dev of X Cube AI the reason for that. I'll keep you updated.

Have a good day,

Julian