PNP0700 ?ˆËÑ ƒ| sÊ¿Î#’?/* SPDX-License-Identifier: GPL-2.0 */ /* Copyright (C) 2020 Oliver Hartkopp * Copyright (C) 2020 Marc Kleine-Budde * Copyright (C) 2020, 2023 Vincent Mailhol */ #ifndef _CAN_LENGTH_H #define _CAN_LENGTH_H #include #include #include #include /* * Size of a Classical CAN Standard Frame header in bits * * Name of Field Bits * --------------------------------------------------------- * Start Of Frame (SOF) 1 * Arbitration field: * base ID 11 * Remote Transmission Request (RTR) 1 * Control field: * IDentifier Extension bit (IDE) 1 * FD Format indicator (FDF) 1 * Data Length Code (DLC) 4 * * including all fields preceding the data field, ignoring bitstuffing */ #define CAN_FRAME_HEADER_SFF_BITS 19 /* * Size of a Classical CAN Extended Frame header in bits * * Name of Field Bits * --------------------------------------------------------- * Start Of Frame (SOF) 1 * Arbitration field: * base ID 11 * Substitute Remote Request (SRR) 1 * IDentifier Extension bit (IDE) 1 * ID extension 18 * Remote Transmission Request (RTR) 1 * Control field: * FD Format indicator (FDF) 1 * Reserved bit (r0) 1 * Data length code (DLC) 4 * * including all fields preceding the data field, ignoring bitstuffing */ #define CAN_FRAME_HEADER_EFF_BITS 39 /* * Size of a CAN-FD Standard Frame in bits * * Name of Field Bits * --------------------------------------------------------- * Start Of Frame (SOF) 1 * Arbitration field: * base ID 11 * Remote Request Substitution (RRS) 1 * Control field: * IDentifier Extension bit (IDE) 1 * FD Format indicator (FDF) 1 * Reserved bit (res) 1 * Bit Rate Switch (BRS) 1 * Error Status Indicator (ESI) 1 * Data length code (DLC) 4 * * including all fields preceding the data field, ignoring bitstuffing */ #define CANFD_FRAME_HEADER_SFF_BITS 22 /* * Size of a CAN-FD Extended Frame in bits * * Name of Field Bits * --------------------------------------------------------- * Start Of Frame (SOF) 1 * Arbitration field: * base ID 11 * Substitute Remote Request (SRR) 1 * IDentifier Extension bit (IDE) 1 * ID extension 18 * Remote Request Substitution (RRS) 1 * Control field: * FD Format indicator (FDF) 1 * Reserved bit (res) 1 * Bit Rate Switch (BRS) 1 * Error Status Indicator (ESI) 1 * Data length code (DLC) 4 * * including all fields preceding the data field, ignoring bitstuffing */ #define CANFD_FRAME_HEADER_EFF_BITS 41 /* * Size of a CAN CRC Field in bits * * Name of Field Bits * --------------------------------------------------------- * CRC sequence (CRC15) 15 * CRC Delimiter 1 * * ignoring bitstuffing */ #define CAN_FRAME_CRC_FIELD_BITS 16 /* * Size of a CAN-FD CRC17 Field in bits (length: 0..16) * * Name of Field Bits * --------------------------------------------------------- * Stuff Count 4 * CRC Sequence (CRC17) 17 * CRC Delimiter 1 * Fixed stuff bits 6 */ #define CANFD_FRAME_CRC17_FIELD_BITS 28 /* * Size of a CAN-FD CRC21 Field in bits (length: 20..64) * * Name of Field Bits * --------------------------------------------------------- * Stuff Count 4 * CRC sequence (CRC21) 21 * CRC Delimiter 1 * Fixed stuff bits 7 */ #define CANFD_FRAME_CRC21_FIELD_BITS 33 /* * Size of a CAN(-FD) Frame footer in bits * * Name of Field Bits * --------------------------------------------------------- * ACK slot 1 * ACK delimiter 1 * End Of Frame (EOF) 7 * * including all fields following the CRC field */ #define CAN_FRAME_FOOTER_BITS 9 /* * First part of the Inter Frame Space * (a.k.a. IMF - intermission field) */ #define CAN_INTERMISSION_BITS 3 /** * can_bitstuffing_len() - Calculate the maximum length with bitstuffing * @destuffed_len: length of a destuffed bit stream * * The worst bit stuffing case is a sequence in which