DBC_File_Format_Documentation(9)

Vector 公司的 DBC 文件格式说明。这类DBC文件可以作为整车CAN网络的描述文件,可以描述各个CAN message(包括ID、传递参数的物理含义等)。

environment_variable_data = 'ENVVAR_DATA_' env_var_name ':'

data_size ';' ;

data_size = unsigned_integer ;

9.1 Environment Variable Value Descriptions

The value descriptions for environment variables provide textual representations of specific values of the variable.

value_descriptions_for_env_var = 'VAL_' env_var_aname

{ value_description } ';' ;

10 Signal Type and Signal Group Definitions

Signal types are used to define the common properties of several signals. They are normally not used in DBC files.

signal_types = {signal_type} ;

signal_type = 'SGTYPE_' signal_type_name ':' signal_size '@'

byte_order value_type '(' factor ',' offset ')' '[' minimum '|' maximum ']' unit default_value ',' value_table ';' ;

signal_type_name = C_identifier ;

default_value = double ;

value_table = value_table_name ;

signal_type_refs = {signal_type_ref} ;

signal_type_ref = 'SGTYPE_' message_id signal_name ':' sig-

nal_type_name ';' ;

Signal groups are used to define a group of signals within a messages, e.g. to de-fine that the signals of a group have to be updated in common.

signal_groups = 'SIG_GROUP_' message_id signal_group_name repeti-

tions ':' { signal_name } ';' ;

signal_group_name = C_identifier ;

repetitions = unsigned_integer ;

11 Comment Definitions

The comment section contains the object comments. For each object having a comment, an entry with the object's type identification is defined in this section.

comments = {comment} ;

comment = 'CM_' (char_string |

'BU_' node_name char_string |

'BO_' message_id char_string |

'SG_' message_id signal_name char_string |

'EV_' env_var_name char_string) ';' ;