noncritical mcus

[bwnance]

add support for hotplugging mcus

[dalegaard]

Hi,

Just some thoughts, feel free to ignore. It would be useful, if instead of marking MCUs as non-critical, functions using each MCU mark them as critical. E.g. an active stepper will mark the MCU it's connected to as critical, an active ADXL, a bed leveling sensor, etc. This way, the user doesn't need to configure anything and the system automatically figures out what is and isn't critical. Obviously the main MCU will always be critical, as it's the timing master, but all other MCUs could start out non-critical.

Basically a reference counting kind of system.

Best regards,
Lasse

[bwnance]

@dalegaard I really like that idea. I'd have to noodle on it a little bit regarding the disconnect/reconnect states - I'd be worried that an on-demand init/release of an MCU would induce too much overhead