【DBC专题】-8-经典CAN2.0 DBC快速切换为CANFD DBC

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1 Classical CAN2.0 DBC快速切换为CANFD DBC

1.1 Classical CAN2.0 DBC的模板文件内容

1.2 CANFD DBC的模板文件内容

1.3 基于Classical CAN2.0 DBC快速切换/修改为CANFD DBC

1.4 基于CANFD DBC快速切换/修改为Classical CAN2.0 DBC

END

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1 Classical CAN2.0 DBC快速切换为CANFD DBC

一个DBC是Classical CAN2.0 DBC还是CANFD DBC取决于它使用的Template模板：常见的Classical CAN2.0 DBC使用的“CANTemplate.dbc”模板；CANFD DBC使用的“CAN_FD Template.dbc”模板。

现在我们来看一下两个Classical CAN2.0 DBC和CANFD DBC的Template模板差异。

1.1 Classical CAN2.0 DBC的模板文件内容

VERSION ""NS_ : NS_DESC_CM_BA_DEF_BA_VAL_CAT_DEF_CAT_FILTERBA_DEF_DEF_EV_DATA_ENVVAR_DATA_SGTYPE_SGTYPE_VAL_BA_DEF_SGTYPE_BA_SGTYPE_SIG_TYPE_REF_VAL_TABLE_SIG_GROUP_SIG_VALTYPE_SIGTYPE_VALTYPE_BO_TX_BU_BA_DEF_REL_BA_REL_BA_DEF_DEF_REL_BU_SG_REL_BU_EV_REL_BU_BO_REL_SG_MUL_VAL_BS_:BU_:BA_DEF_  "BusType" STRING ;
BA_DEF_DEF_  "BusType" "CAN";

1.2 CANFD DBC的模板文件内容

VERSION ""NS_ : NS_DESC_CM_BA_DEF_BA_VAL_CAT_DEF_CAT_FILTERBA_DEF_DEF_EV_DATA_ENVVAR_DATA_SGTYPE_SGTYPE_VAL_BA_DEF_SGTYPE_BA_SGTYPE_SIG_TYPE_REF_VAL_TABLE_SIG_GROUP_SIG_VALTYPE_SIGTYPE_VALTYPE_BO_TX_BU_BA_DEF_REL_BA_REL_BA_DEF_DEF_REL_BU_SG_REL_BU_EV_REL_BU_BO_REL_SG_MUL_VAL_BS_:BU_:BA_DEF_ BO_  "CANFD_BRS" ENUM  "0","1";
BA_DEF_  "DBName" STRING ;
BA_DEF_  "BusType" STRING ;
BA_DEF_ BU_  "NodeLayerModules" STRING ;
BA_DEF_ BU_  "ECU" STRING ;
BA_DEF_ BU_  "CANoeJitterMax" INT 0 0;
BA_DEF_ BU_  "CANoeJitterMin" INT 0 0;
BA_DEF_ BU_  "CANoeDrift" INT 0 0;
BA_DEF_ BU_  "CANoeStartDelay" INT 0 0;
BA_DEF_ BO_  "VFrameFormat" ENUM  "StandardCAN","ExtendedCAN","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","StandardCAN_FD","ExtendedCAN_FD";
BA_DEF_DEF_  "CANFD_BRS" "1";
BA_DEF_DEF_  "DBName" "";
BA_DEF_DEF_  "BusType" "";
BA_DEF_DEF_  "NodeLayerModules" "";
BA_DEF_DEF_  "ECU" "";
BA_DEF_DEF_  "CANoeJitterMax" 0;
BA_DEF_DEF_  "CANoeJitterMin" 0;
BA_DEF_DEF_  "CANoeDrift" 0;
BA_DEF_DEF_  "CANoeStartDelay" 0;
BA_DEF_DEF_  "VFrameFormat" "StandardCAN";
BA_ "BusType" "CAN FD";
BA_ "DBName" "CANFD";

1.3 基于Classical CAN2.0 DBC快速切换/修改为CANFD DBC

通过1.1和1.2章节的对比您可以清楚的发现，Classical CAN2.0 DBC和CANFD DBC二者Template模板的差异在DBC文件内容的末尾。

用文本编辑工具(记事本，Notepad++…)打开Classical CAN2.0 DBC，找到“BA_DEF_DEF_ "BusType" "CAN";”标签，用下列标签手动替换，并保存DBC文件。这样一个Classical CAN2.0 DBC就能快速变成一个CANFD DBC。

BA_DEF_ BO_  "CANFD_BRS" ENUM  "0","1";
BA_DEF_  "DBName" STRING ;
BA_DEF_ BU_  "NodeLayerModules" STRING ;
BA_DEF_ BU_  "ECU" STRING ;
BA_DEF_ BU_  "CANoeJitterMax" INT 0 0;
BA_DEF_ BU_  "CANoeJitterMin" INT 0 0;
BA_DEF_ BU_  "CANoeDrift" INT 0 0;
BA_DEF_ BU_  "CANoeStartDelay" INT 0 0;
BA_DEF_ BO_  "VFrameFormat" ENUM  "StandardCAN","ExtendedCAN","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","reserved","StandardCAN_FD","ExtendedCAN_FD";
BA_DEF_DEF_  "CANFD_BRS" "1";
BA_DEF_DEF_  "DBName" "";
BA_DEF_DEF_  "BusType" "";
BA_DEF_DEF_  "NodeLayerModules" "";
BA_DEF_DEF_  "ECU" "";
BA_DEF_DEF_  "CANoeJitterMax" 0;
BA_DEF_DEF_  "CANoeJitterMin" 0;
BA_DEF_DEF_  "CANoeDrift" 0;
BA_DEF_DEF_  "CANoeStartDelay" 0;
BA_DEF_DEF_  "VFrameFormat" "StandardCAN";
BA_ "BusType" "CAN FD";
BA_ "DBName" "CANFD";

1.4 基于CANFD DBC快速切换/修改为Classical CAN2.0 DBC

将1.3章节反过来，一个CANFD DBC就能快速变成一个Classical CAN2.0 DBC。但要注意，DLC大于8的Message，以及帧类型（CANFD标准帧和CANFD扩展帧）的调整：

一个CANFD DBC中既有CANFD帧，也有经典CAN帧，“CANFD扩展帧和标准帧”帧类型调整为“经典CAN扩展帧和标准帧”，需要避免“CANFD扩展帧和标准帧的CANID”与“经典CAN扩展帧和标准帧的CANID”一样的情况；
对于DLC大于8的“CANFD扩展帧和标准帧”调整为“经典CAN帧扩展帧和标准帧”，需要拆分成多个经典CAN帧（拆分后，各帧分配一个独有的ID）；
CANFD帧独有的Attribute属性需要被删除。