File syn_j1939.c¶

FileList > proto > syn_j1939.c

SAE J1939 Heavy-Duty Vehicle CAN Protocol Stack implementation.

#include "../util/syn_assert.h"
#include "../util/syn_pack.h"
#include "syn_j1939.h"
#include <string.h>

Public Functions¶

Type	Name
SYN_Status	syn_j1939_build_address_claim (const SYN_J1939_Node * node, SYN_CAN_Frame * frame) Build an Address Claim CAN frame for the node.
SYN_Status	syn_j1939_build_request (uint8_t sa, uint8_t da, uint32_t requested_pgn, SYN_CAN_Frame * frame) Build a Request PGN CAN frame (PGN 59904).
SYN_Status	syn_j1939_build_tp_bam (uint8_t sa, uint32_t pgn, uint16_t total_bytes, SYN_CAN_Frame * frame) Build a Transport Protocol Broadcast Announce Message (TP.CM_BAM).
SYN_Status	syn_j1939_build_tp_dt (uint8_t sa, uint8_t sequence, const uint8_t * payload, size_t payload_len, SYN_CAN_Frame * frame) Build a Transport Protocol Data Transfer packet (TP.DT).
uint32_t	syn_j1939_calc_pgn (uint8_t dp, uint8_t pf, uint8_t ps) Compute 24-bit Parameter Group Number from Data Page, PF, and PS.
SYN_Status	syn_j1939_dtc_add_active (SYN_J1939_DTCLog * log, uint32_t spn, uint8_t fmi) Add an active Diagnostic Trouble Code (DM1).
SYN_Status	syn_j1939_dtc_clear_active (SYN_J1939_DTCLog * log, uint32_t spn, uint8_t fmi) Clear an active DTC and move it to previously active log (DM2).
void	syn_j1939_dtc_clear_dm11 (SYN_J1939_DTCLog * log) Clear all active DTCs (DM11 Request handling).
void	syn_j1939_dtc_clear_dm3 (SYN_J1939_DTCLog * log) Clear all previously active DTCs (DM3 Request handling).
void	syn_j1939_dtc_log_init (SYN_J1939_DTCLog * log) Initialize a J1939 Diagnostic Trouble Code logger.
size_t	syn_j1939_encode_dm1 (uint8_t * buf, size_t buf_size, const SYN_J1939_DTC * dtc_list, size_t dtc_count, uint8_t mil_lamp_status) Encode Active Diagnostic Trouble Codes into a DM1 buffer (PGN 65226).
size_t	syn_j1939_encode_dm2 (uint8_t * buf, size_t buf_size, const SYN_J1939_DTC * dtc_list, size_t dtc_count, uint8_t mil_lamp_status) Encode a J1939 DM2 payload (Previously Active Diagnostic Trouble Codes).
uint32_t	syn_j1939_id_pack (uint8_t priority, uint32_t pgn, uint8_t sa, uint8_t da) Pack J1939 bitfields into a 29-bit CAN Identifier.
SYN_Status	syn_j1939_id_unpack (uint32_t can_id, SYN_J1939_Header * header) Unpack a 29-bit CAN Identifier into a J1939 Header structure.
void	syn_j1939_name_decode (const uint8_t buf, SYN_J1939_Name * name) Decode an 8-byte buffer into a 64-bit J1939 NAME structure.
void	syn_j1939_name_encode (const SYN_J1939_Name * name, uint8_t buf) Encode a 64-bit J1939 NAME into an 8-byte buffer.
SYN_Status	syn_j1939_node_init (SYN_J1939_Node * node, uint8_t sa, const SYN_J1939_Name * name) Initialize a J1939 Node instance.
SYN_Status	syn_j1939_process_frame (SYN_J1939_Node * node, const SYN_CAN_Frame * frame, uint32_t * out_pgn, const uint8_t ** out_data, size_t * out_len) Process an incoming CAN frame in the J1939 node state machine.

Public Functions Documentation¶

function syn_j1939_build_address_claim¶

Build an Address Claim CAN frame for the node.

SYN_Status syn_j1939_build_address_claim (
    const SYN_J1939_Node * node,
    SYN_CAN_Frame * frame
)

Parameters:

node Pointer to J1939 node instance.
frame Output CAN frame.

Returns:

SYN_OK on success.

function syn_j1939_build_request¶

Build a Request PGN CAN frame (PGN 59904).

SYN_Status syn_j1939_build_request (
    uint8_t sa,
    uint8_t da,
    uint32_t requested_pgn,
    SYN_CAN_Frame * frame
)

Parameters:

sa Source address sending request.
da Destination address requested (0xFF for broadcast).
requested_pgn PGN being requested.
frame Output CAN frame.

Returns:

SYN_OK on success.

function syn_j1939_build_tp_bam¶

Build a Transport Protocol Broadcast Announce Message (TP.CM_BAM).

SYN_Status syn_j1939_build_tp_bam (
    uint8_t sa,
    uint32_t pgn,
    uint16_t total_bytes,
    SYN_CAN_Frame * frame
)

Parameters:

sa Source address.
pgn PGN of payload.
total_bytes Total payload length in bytes (9 to 1785).
frame Output CAN frame.

Returns:

SYN_OK on success.

function syn_j1939_build_tp_dt¶

Build a Transport Protocol Data Transfer packet (TP.DT).

SYN_Status syn_j1939_build_tp_dt (
    uint8_t sa,
    uint8_t sequence,
    const uint8_t * payload,
    size_t payload_len,
    SYN_CAN_Frame * frame
)

Parameters:

sa Source address.
sequence Packet sequence number (1 to 255).
payload Pointer to payload chunk (up to 7 bytes).
payload_len Length of chunk (1 to 7 bytes).
frame Output CAN frame.

Returns:

SYN_OK on success.

function syn_j1939_calc_pgn¶

Compute 24-bit Parameter Group Number from Data Page, PF, and PS.

uint32_t syn_j1939_calc_pgn (
    uint8_t dp,
    uint8_t pf,
    uint8_t ps
)

Parameters:

dp Data Page (0 or 1).
pf PDU Format (0-255).
ps PDU Specific (0-255).

Returns:

24-bit PGN value.

function syn_j1939_dtc_add_active¶

Add an active Diagnostic Trouble Code (DM1).

SYN_Status syn_j1939_dtc_add_active (
    SYN_J1939_DTCLog * log,
    uint32_t spn,
    uint8_t fmi
)

function syn_j1939_dtc_clear_active¶

Clear an active DTC and move it to previously active log (DM2).

SYN_Status syn_j1939_dtc_clear_active (
    SYN_J1939_DTCLog * log,
    uint32_t spn,
    uint8_t fmi
)

function syn_j1939_dtc_clear_dm11¶

Clear all active DTCs (DM11 Request handling).

void syn_j1939_dtc_clear_dm11 (
    SYN_J1939_DTCLog * log
)

function syn_j1939_dtc_clear_dm3¶

Clear all previously active DTCs (DM3 Request handling).

void syn_j1939_dtc_clear_dm3 (
    SYN_J1939_DTCLog * log
)

function syn_j1939_dtc_log_init¶

Initialize a J1939 Diagnostic Trouble Code logger.

void syn_j1939_dtc_log_init (
    SYN_J1939_DTCLog * log
)

function syn_j1939_encode_dm1¶

Encode Active Diagnostic Trouble Codes into a DM1 buffer (PGN 65226).

size_t syn_j1939_encode_dm1 (
    uint8_t * buf,
    size_t buf_size,
    const SYN_J1939_DTC * dtc_list,
    size_t dtc_count,
    uint8_t mil_lamp_status
)

Parameters:

buf Output buffer.
buf_size Buffer capacity.
dtc_list Array of DTC structures.
dtc_count Number of DTCs in list.
mil_lamp_status 2-bit MIL status.

Returns:

Total bytes written to buffer.

function syn_j1939_encode_dm2¶

Encode a J1939 DM2 payload (Previously Active Diagnostic Trouble Codes).

size_t syn_j1939_encode_dm2 (
    uint8_t * buf,
    size_t buf_size,
    const SYN_J1939_DTC * dtc_list,
    size_t dtc_count,
    uint8_t mil_lamp_status
)

function syn_j1939_id_pack¶

Pack J1939 bitfields into a 29-bit CAN Identifier.

uint32_t syn_j1939_id_pack (
    uint8_t priority,
    uint32_t pgn,
    uint8_t sa,
    uint8_t da
)

Parameters:

priority Priority (0-7, typically 6).
pgn Parameter Group Number (18-bit).
sa Source Address (0-255).
da Destination Address (used if PGN is PDU1 format).

Returns:

29-bit CAN ID.

function syn_j1939_id_unpack¶

Unpack a 29-bit CAN Identifier into a J1939 Header structure.

SYN_Status syn_j1939_id_unpack (
    uint32_t can_id,
    SYN_J1939_Header * header
)

Parameters:

can_id 29-bit Extended CAN Identifier.
header Output structure receiving parsed fields.

Returns:

SYN_OK on success, or SYN_INVALID_PARAM if header is NULL.

function syn_j1939_name_decode¶

Decode an 8-byte buffer into a 64-bit J1939 NAME structure.

void syn_j1939_name_decode (
    const uint8_t buf,
    SYN_J1939_Name * name
)

Parameters:

buf Source 8-byte buffer.
name Output NAME structure.

function syn_j1939_name_encode¶

Encode a 64-bit J1939 NAME into an 8-byte buffer.

void syn_j1939_name_encode (
    const SYN_J1939_Name * name,
    uint8_t buf
)

Parameters:

name Source NAME structure.
buf Output 8-byte buffer.

function syn_j1939_node_init¶

Initialize a J1939 Node instance.

SYN_Status syn_j1939_node_init (
    SYN_J1939_Node * node,
    uint8_t sa,
    const SYN_J1939_Name * name
)

Parameters:

node Pointer to node instance.
sa Preferred Source Address (0-253).
name Device 64-bit NAME configuration.

Returns:

SYN_OK on success.

function syn_j1939_process_frame¶

Process an incoming CAN frame in the J1939 node state machine.

SYN_Status syn_j1939_process_frame (
    SYN_J1939_Node * node,
    const SYN_CAN_Frame * frame,
    uint32_t * out_pgn,
    const uint8_t ** out_data,
    size_t * out_len
)

Parameters:

node Pointer to node.
frame Incoming CAN frame.
out_pgn Output received PGN.
out_data Pointer to receiving reassembled or single-frame payload.
out_len Output payload length.

Returns:

SYN_OK if a complete J1939 message is ready, or SYN_BUSY if multi-packet assembly is in progress.

The documentation for this class was generated from the following file src/syntropic/proto/syn_j1939.c