can.h File Reference

Shared CAN 2.0 frame type for the CAN-based industrial codecs (one source of truth). More...

#include <stdint.h>

Go to the source code of this file.

Classes
struct	CanFrame

Macros
#define	DET_CAN_MAX_DLC   8
	classic CAN carries at most 8 data octets.
#define	DET_CAN_STD_ID_MASK   0x7FFu
	11-bit standard identifier.
#define	DET_CAN_EXT_ID_MASK   0x1FFFFFFFu
	29-bit extended identifier.

Detailed Description

Shared CAN 2.0 frame type for the CAN-based industrial codecs (one source of truth).

CANopen, J1939, DeviceNet, and NMEA 2000 all ride classic CAN frames (an 11-bit or 29-bit identifier plus up to 8 data octets). They share this one frame struct so the frame shape lives in a single place; each codec only builds and parses the id + data, never the wire bus itself.

The physical CAN controller is the application's: the ESP32's built-in TWAI peripheral with a transceiver (e.g. SN65HVD230), or an external MCP2515 over SPI. The app hands a received CanFrame to a codec's parser, or transmits a CanFrame a builder filled in. That keeps these codecs pure and host-testable, exactly like the serial / TCP codecs.

Header-only, not feature-gated: each CAN codec includes it behind its own DETWS_ENABLE_* guard.

Author

Douglas Quigg (dstroy0)

Date

2026

Definition in file can.h.

Macro Definition Documentation

DET_CAN_MAX_DLC

#define DET_CAN_MAX_DLC   8

classic CAN carries at most 8 data octets.

Definition at line 30 of file can.h.

DET_CAN_STD_ID_MASK

#define DET_CAN_STD_ID_MASK   0x7FFu

11-bit standard identifier.

Definition at line 31 of file can.h.

DET_CAN_EXT_ID_MASK

#define DET_CAN_EXT_ID_MASK   0x1FFFFFFFu

29-bit extended identifier.

Definition at line 32 of file can.h.