mirror of https://github.com/arendst/Tasmota.git
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
#ifndef CAN_H_
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#define CAN_H_
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#include <stdint.h>
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typedef unsigned char __u8;
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typedef unsigned short __u16;
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typedef unsigned long __u32;
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/* special address description flags for the CAN_ID */
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#define CAN_EFF_FLAG 0x80000000UL /* EFF/SFF is set in the MSB */
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#define CAN_RTR_FLAG 0x40000000UL /* remote transmission request */
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#define CAN_ERR_FLAG 0x20000000UL /* error message frame */
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/* valid bits in CAN ID for frame formats */
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#define CAN_SFF_MASK 0x000007FFUL /* standard frame format (SFF) */
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#define CAN_EFF_MASK 0x1FFFFFFFUL /* extended frame format (EFF) */
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#define CAN_ERR_MASK 0x1FFFFFFFUL /* omit EFF, RTR, ERR flags */
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/*
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* Controller Area Network Identifier structure
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*
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* bit 0-28 : CAN identifier (11/29 bit)
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* bit 29 : error message frame flag (0 = data frame, 1 = error message)
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* bit 30 : remote transmission request flag (1 = rtr frame)
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* bit 31 : frame format flag (0 = standard 11 bit, 1 = extended 29 bit)
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*/
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typedef __u32 canid_t;
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#define CAN_SFF_ID_BITS 11
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#define CAN_EFF_ID_BITS 29
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/* CAN payload length and DLC definitions according to ISO 11898-1 */
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#define CAN_MAX_DLC 8
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#define CAN_MAX_DLEN 8
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struct can_frame {
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canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
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__u8 can_dlc; /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
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__u8 data[CAN_MAX_DLEN] __attribute__((aligned(8)));
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};
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#endif /* CAN_H_ */
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