Electronics > Microcontrollers

Parsing UART packets / state machines / packed structs

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uer166, note one important thing original ECU does based on BMS data: regenerative brake current limiting.
M365 BMS (and all other Xiaomi/Ninebot BMSes) doesn't have an overcharge protection on the discharge port (a sudden cutoff during regen braking would be no fun). Instead of that the BMS reports an overvoltage status to the ECU (bit 9 of reg 0x30) and the ECU decreases the regen current gradually until the OV condition disappears.


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