Q: How does mGBA detect if a loaded Game Boy ROM is a GameBoy Camera?

[HerrZatacke]

Hello,

I'm currently developing a replacement ROM for the GameBoy Camera. (since about half a year there is a solution for a flashable replacement PCB)

When using mGBA with an original Camera ROM, I can see the "no image" image in the camera view inlcuding a videofeed with an attached webcam.

Using my ROM, I'm not seeing this.
You can check my project for reference here: HerrZatacke/2bit-pxlr-studio

Could you maybe hint me into the direction on how mGBA decides the loaded ROM needs to/can access the camera?

greetings,
Andreas

[endrift]

It already has decided the camera is accessible, as it turned on the camera on my laptop when I ran it. It might be an issue with how you're actually talking to the camera.

[HerrZatacke]

Were you using my ROM or one from an original camera?

[endrift]

Your ROM. Have you managed to test it on actual hardware? I have a tentative fix in mGBA, but I'm not 100% sure it's right. It prooobably is though.

[HerrZatacke]

Oh cool! That sounds good - I'm running mGBA 0.9.3 (should be the newest?) but it seems nothing is written to the RAM where the camera is looking for the image data.
Running on actual hardware works fine.