CpCanMsg_s Struct Reference

CAN message structure. More...

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

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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:

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Field Documentation

_U08 CpCanMsg_s::aubByte[8]

byte access, array of 8 byte

_U32 CpCanMsg_s::aulLong[2]

32 bit access, array of 2 longs

_U16 CpCanMsg_s::auwWord[4]

16 bit access, array of 4 words

_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).

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.

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::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

_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).

_U32 CpCanMsg_s::ulExt

identifier for Extended Frame

_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).

_U16 CpCanMsg_s::uwStd

identifier for Standard Frame

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The documentation for this struct was generated from the following file:

• canpie.h