carrot/selfdrive/car/README.md

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## Car port structure
### interface.py
Generic interface to send and receive messages from CAN (controlsd uses this to communicate with car)
### fingerprints.py
Fingerprints for matching to a specific car
### carcontroller.py
Builds CAN messages to send to car
##### carstate.py
Reads CAN from car and builds openpilot CarState message
##### values.py
Limits for actuation, general constants for cars, and supported car documentation
##### radar_interface.py
Interface for parsing radar points from the car