Saving Protobuf breaks Core0 functionality

[arntsonl]

Prerequisites

Please check the following before posting an issue / bug report.

• I am running the latest version of the firmware found HERE
• I have checked the documentation HERE and found no answer
• I checked to make sure that this issue has not already been filed HERE
• I am reporting the issue to the correct repository

Context

Please provide all relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

• Firmware Version: dev
• Name of device: n/a
• Link to where you purchased the device:
• Is this a custom build?:
• Operating System:
• Browser:

Expected Behavior

Protobuf should be able to save via the Save() system without breaking any functionality on the GP2040 project.

Current Behavior

Save() causes everything to lock up including the tud_task and tuh_task calls because of how complex protobuf is. This should be moved over to Core1 if possible to leave Core0's usb processing abilities.

Steps to Reproduce

Please provide detailed steps for reproducing the issue.

1. Turn on PS passthrough and plug in a dongle
2. Change led animations
3. Observe the ps passthrough device reconnects
4. Change turbo speed
5. Observe the ps passthrough device reconnects

Screenshots & Files

Please include any relevant screenshots or files here. If you are having issues with a board please include images of the front and back of the board.

[arntsonl]

I'll take point on this one since I've been doing a lot of core revamping.

[bsstephan]

Is it because protobuf is complicated, or is it because FlashPROM locks the cores when writing?

[bsstephan]

@arntsonl --- https://github.com/OpenStickCommunity/GP2040-CE/blob/main/lib/FlashPROM/src/FlashPROM.cpp#L16 is what I mean, by the way. I would have to look at nanopb but I would be surprised if the serialization was a major problem, since the config is already in a struct at runtime and just has to be packed in order to be written.

[arntsonl]

Oooooh I'm not sure! That will have to be part of the investigation