1.
What is bit stuffing in CAN messages? Why do we use it ?
Solution
Bit stuffing is a provider for Error Handling when Transfer Layer instead of Physical Layer in
Control Area Network (CAN).A Controller Area Network (CAN bus) is a vehicle bus standard
designed to allow microcontrollers and devices to communicate with each other in applications
without a host computer. It is a message-based protocol, designed originally for multiplex
electrical wiring within automobiles, but is also used in many other contexts.
It serves two purposes
In CAN bit Synchronization happens with an edge. So inserting an edge after 5 consecutive
homogeneous bits ensures synchronization of all nodes. When the receiver is receiving
homogeneous bits it will not understand whether it is reading the bit. so to avoid resulting Bit
error Bit Stuffing is used.