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== DBC (CAN Databases) ==

[[文件:CAN-DBC-File-Format-01.png]]

'''DBC Message Format:'''
* A message starts with BO_ and the ID must be unique and in decimal (not hexadecimal)
* The DBC ID adds 3 extra bits for 29 bit CAN IDs to serve as an 'extended ID' flag
* The name must be unique, 1-32 characters and may contain [A-z], digits and underscores
* The length (DLC) must be an integer between 0 and 1785
* The sender is the name of the transmitting node, or Vector__XXX if no name is available


'''DBC Signal Format:'''
* Each message contains 1+ signals that start with SG_
* The name must be unique, 1-32 characters and may contain [A-z], digits and underscores
* The bit start counts from 0 and marks the start of the signal in the data payload
* The bit length is the signal length
* The @1 specifies that the byte order is little-endian/Intel (vs @0 for big-endian/Motorola)
* The + informs that the value type is unsigned (vs - for signed signals)
* The (scale,offset) values are used in the physical value linear equation (more below)
* The [min|max] and unit are optional meta information (they can e.g. be set to [0|0] and "")
* The receiver is the name of the receiving node (again, Vector__XXX is used as default)


* [https://www.csselectronics.com/screen/page/can-dbc-file-database-intro/ CAN DBC File - QuickStart]
* [https://www.csselectronics.com/pages/dbc-editor-can-bus-database Online DBC Editor]
* https://github.com/joshwardell/model3dbc/blob/master/README.md
* https://github.com/commaai/opendbc

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