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Q: How does mGBA detect if a loaded Game Boy ROM is a GameBoy Camera? #2557

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HerrZatacke opened this issue Jun 14, 2022 · 4 comments
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Q: How does mGBA detect if a loaded Game Boy ROM is a GameBoy Camera? #2557

HerrZatacke opened this issue Jun 14, 2022 · 4 comments

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@HerrZatacke
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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
@HerrZatacke HerrZatacke changed the title How does mGBA detect if a loaded Game Boy ROM is a GameBoy Camera? Q: How does mGBA detect if a loaded Game Boy ROM is a GameBoy Camera? Jun 14, 2022
@HerrZatacke HerrZatacke mentioned this issue Jun 14, 2022
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@endrift
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endrift commented Jun 14, 2022

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

@endrift
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endrift commented Jun 14, 2022

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
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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.

rtomasa pushed a commit to rtomasa/mgba that referenced this issue Sep 15, 2023
@endrift @rtomasa
GB MBC: Fix edge case with Pocket Cam register accesses (fixes mgba-e…
20c80e7 
…mu#2557)
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@endrift @HerrZatacke