• Home • Files • Structures         • Download CpCanMsg_s Struct Reference Detailed Description For transmission and reception of CAN messages a structure which holds all necessary informations is used. The structure has the following data fields: Data Fields union {    _U16   uwStd    _U32   ulExt }  tuMsgId union {    _U08   aubByte [8]    _U16   auwWord [4]    _U32   aulLong [2] }  tuMsgData _U08  ubMsgDLC _U08  ubMsgCtrl _TsCpTime  tsMsgTime _U32  ulMsgUser Field Documentation _U16 CpCanMsg_s::uwStd identifier for Standard Frame _U32 CpCanMsg_s::ulExt identifier for Extended Frame union { ... } CpCanMsg_s::tuMsgId The identifier field may have 11 bits for standard frames (CAN specification 2.0A) or 29 bits for extended frames (CAN specification 2.0B). The three most significant bits are reserved (always read 0). See also: Mask values for CAN messages _U08 CpCanMsg_s::aubByte[8] byte access, array of 8 byte _U16 CpCanMsg_s::auwWord[4] 16 bit access, array of 4 words _U32 CpCanMsg_s::aulLong[2] 32 bit access, array of 2 longs union { ... } CpCanMsg_s::tuMsgData The data field has up to 8 bytes (64 bit) of message data. The number of used bytes is described via the structure member ubMsgDLC. _U08 CpCanMsg_s::ubMsgDLC The data length code denotes the number of data bytes which are transmitted by a message. The possible value range for the data length code is from 0 to 8 (bytes). _U08 CpCanMsg_s::ubMsgCtrl The structure member ubMsgCtrl defines the different data frames (2.0A / 2.0B) and the RTR frames. Bit 0: Extended Frame if set to 1, else Standard Frame Bit 1: Remote Frame if set to 1, else Data Frame Bit 2: Receiver Overrun if set to 1, else normal reception See also: Mask values for CAN messages _TsCpTime CpCanMsg_s::tsMsgTime The time stamp field defines the time when a CAN message was received by the CAN controller. This is an optional field (available if CP_CAN_MSG_TIME is set to 1). _U32 CpCanMsg_s::ulMsgUser The field user data can hold a 32 bit value, which is defined by the user. This is an optional field (available if CP_CAN_MSG_USER is set to 1). The documentation for this struct was generated from the following file: canpie.h © MicroControl GmbH & Co. KG CANpie - V1.93