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o-gs / dji-firmware-tools

Tools for handling firmwares of DJI products, with focus on quadcopters.
GNU General Public License v3.0
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Lifting the software limit of 4k video camera on Mini 2 SE #356

Open gunplar opened 10 months ago

gunplar commented 10 months ago

From the list of enums in comm_og_service_tool I guess the Mini 2 SE is not yet supported. But can anyone help me find the end goal step to enable 4k video (for example say in the original Mini SE)? At least then I can try to find a way to reverse engineer the other steps by checking the required input. I have the Mini 2 SE, so if anyone can instruct me where I can contribute to this project, I would help. Thanks.

mefistotelis commented 10 months ago

The steps would be:

  1. Analyze the hardware, look for what chip does the video encode https://github.com/o-gs/dji-firmware-tools/wiki/WM1605-Main-Processing-Core-Board

  2. Extract firmware, extract content of the specific module for the chip you've identified

  3. Look into the file/partition which contains code for the function you want. -- If you want to modify bitrate tables within FW, find the right tables -- If you want to change the values through DUML, look at the code receiving packets

  4. When stuck, search the web - there were people already tinkering with the same or similar chip, what did they figured out? The DJI firmware is a modification of manufacturers SDK for the chip, like in all products - maybe you can find the SDK, or some info on it?

  5. Apply results -- If you found a way to do this through DUML, you can update dissectors in this project to include your findings. And possibly add a function to the service tool. -- If you found that hard-coded tables have to be modified, then you still need a way of flashing your changes back to the drone. While our tools support re-signing the FW, private keys are required to do that without further changes. These are not public, so - further changes.

fedecarpi commented 3 months ago

From the list of enums in comm_og_service_tool I guess the Mini 2 SE is not yet supported. But can anyone help me find the end goal step to enable 4k video (for example say in the original Mini SE)? At least then I can try to find a way to reverse engineer the other steps by checking the required input. I have the Mini 2 SE, so if anyone can instruct me where I can contribute to this project, I would help. Thanks.

Hey @gunplar was you able to interact with the mini 2 SE ? As you mentioned, looking into comm_og_service_tool is not yet supported but just wondering if we could use the enum for mavic/mini 2 to send the gimbal calibration instructions. Best! Fede