j1939_msg.h File Reference

Detailed Description

The functions in this file are used to convert a CAN message identifier to J1939 specific values and vice versa.

Include dependency graph for j1939_msg.h:

Functions
uint32_t	J1939_MsgIdFromPgn (uint16_t uwPriorityV, uint32_t ulPgnV, uint8_t ubDestAddrV, uint8_t ubSrcAddrV)
uint8_t	J1939_MsgPageFromId (uint32_t ulIdentifierV)
uint32_t	J1939_MsgPgnFromId (uint32_t ulIdentifierV)
uint8_t	J1939_MsgPriorityFromId (uint32_t ulIdentifierV)

Function Documentation

J1939_MsgIdFromPgn()

uint32_t J1939_MsgIdFromPgn	(	uint16_t	uwPriorityV,
		uint32_t	ulPgnV,
		uint8_t	ubDestAddrV,
		uint8_t	ubSrcAddrV )

Parameters

[in]	uwPriorityV	- Priority value
[in]	ulPgnV	- PGN value
[in]	ubDestAddrV	- Destination address
[in]	ubSrcAddrV	- Source address

Returns

Extended identifier value

This function calculates the CAN identifier with the supplied values for priority, Parameter Group Number (PGN) and source address. The parameter ubDestAddrV is only evaluated for PGN values less than 61440, i.e. the PDU format is less than 240.

J1939_MsgPageFromId()

uint8_t J1939_MsgPageFromId

(

uint32_t

ulIdentifierV

)

Parameters

[in]

ulIdentifierV

- Extended identifier value

Returns

Data page

This function calculates the data page value (0 to 3) from the passed CAN identifier value, given by ulIdentifierV.

J1939_MsgPgnFromId()

uint32_t J1939_MsgPgnFromId

(

uint32_t

ulIdentifierV

)

Calculate PGN.

Parameters

ulIdentifierV

- Extended identifier value

Returns

PGN

This function calculates the Parameter Group number (PGN) from the passed CAN identifier value, given by ulIdentifierV.

J1939_MsgPriorityFromId()

uint8_t J1939_MsgPriorityFromId

(

uint32_t

ulIdentifierV

)

Calculate priority.

Parameters

ulIdentifierV

- Extended identifier value

Returns

PGN

This function calculates the priority from the passed CAN identifier value, given by ulIdentifierV.