摘要:
A method for serial data transfer in a bus system having at least two bus subscribers that exchange messages via the bus, the transmitted messages having a CAN standard ISO 11898-1 structure, where for a first marker (EDL), the control field of the messages, divergently from ISO 11898-1, encompasses more than 6 bits, and for the EDL, the data field of the messages, divergently from ISO 11898-1, may encompass more than 8 bytes, the values of the 4 bits of the data length code being interpreted divergently from ISO 11898-1 to establish the data field size, and for a second marker (BRS), the bit length for at least one predefined or predefinable region within the message assumes a value that is shortened as to the bit length used before the second marker was present, the region beginning at the earliest with the second marker and ending at the latest with the CRC delimiter, and the BRS occurring only when the EDL is present, and occurring in the control field of the messages which encompasses more than 6 bits.
摘要:
A method and a bus connection unit for selectively waking participants of a bus system in an idle state, the participants not in the idle state exchanging messages via the bus using a serial communication protocol, the messages characterized by a leading identifier, the participants not in the idle state deciding based on the identifier whether they receive the message, the messages being evaluated by the participants in the idle state in at least three phases, a number of signal properties, edges and/or edge changes being determined in a first phase, a sequence of time intervals between signal properties, edges and/or edge changes being determined in a second phase, a wake pattern being determined from the serial signal sequence of the message in a third phase, and participants in the idle state leaving the idle state as a function of the items of information determined during the three phases.
摘要:
A method is described for checking the correct functioning of a serial data transmission in a bus system having at least two bus users. The bus users are connected to the bus via a bus connection unit and exchange messages via the bus. The sending access to the bus for each message is granted to a bus user via the arbitration process according to CAN standard ISO 11898-1, this bus user becoming the sender for this message. The messages have a logic structure according to the CAN standard, i.e., are composed of a start of frame bit, arbitration field, control field, data field, CRC field, acknowledge field, and end of frame field. The correct functioning of the data transmission is checked during the transmission by comparing a transmission signal, sent to the bus connection unit, to the reception signal (CAN_RX) received by the bus connection unit. The method is characterized in that a transmission signal (CAN_TX_DEL), which is delayed by a delay time (T_DELAY) compared to the transmission signal (CAN_TX), is held in the sender, and the undelayed transmission signal (CAN_TX) or the delayed transmission signal (CAN_TX_DEL) is used for checking the correct functioning of the data transmission, as a function of a switchover.
摘要:
A method and an apparatus for data transfer in a network having at least two data processing units that exchange messages via the network are described, the exchanged messages having a logical structure in accordance with the CAN specification ISO 11898-1, coding of the bits for at least one first predefinable region within the exchanged messages being accomplished according to the method in accordance with the CAN standard ISO-11898-1, and such that when a switchover condition exists, coding of the bits for at least one second predefinable region within the exchanged messages is accomplished according to a method departing from the CAN standard ISO 11898-1.
摘要:
An apparatus for waking up users of a CAN bus system, wherein a sensing element, in particular a counter, is provided which senses at least one predefined signal property of the signals transmitted on the bus system and initiates the further wakeup operation when a predefined number is reached with reference to the signal property, the data stream of the CAN bus itself being used as a clock for detecting the signal property.
摘要:
A method for serially communicating by exchanging data frames between a transmitting and at least one receiving node connected by a bus, transmit/receive roles being assigned to nodes for each data frame by the CAN ISO 11898-1 (“CAN”) arbitration procedure, exchanged data frames having a structure based on CAN, data frames being a bit sequence, the structure of the data frames including a Start-Of-Frame-Bit, and Fields for Arbitration, Control, Data, CRC, Acknowledge, and End-Of-Frame, the Data Field may have a zero-bit length, other Fields containing at least two bits, each having a bit time divided into Time Segments, the bit-rate defined by the bit time's reciprocal value, for at least one first predeterminable part of the exchanged data frames the bit-rate lies below 1 Mbit/s, for at least one second predeterminable part the bit-rate lies higher, at least two different Time Segment value sets being predeterminable for each part.
摘要翻译:通过在由总线连接的发送和至少一个接收节点之间交换数据帧来进行串行通信的方法,通过CAN ISO 11898-1(“CAN”)仲裁过程向每个数据帧的节点分配发送/接收角色, 具有基于CAN的结构的交换的数据帧,数据帧是比特序列,包括帧起始位的数据帧和用于仲裁的字段的结构,控制,数据,CRC,确认和结束 - 帧,数据字段可以具有零比特长度,其他字段包含至少两个比特,每个字段具有被分成时间段的比特时间,比特时间的倒数值定义的比特率,用于至少一个第一可预定的 交换的数据帧的一部分,比特率低于1Mbit / s,对于至少一个第二可预定部分,比特率较高,至少两个不同的时间段值集合对于每个部分是可预先确定的。
摘要:
A method for transmitting first and second data between subscriber stations of a bus system via a first channel jointly used by a plurality of subscriber stations and via a second channel of the bus system, used in addition to the first channel by a plurality of subscriber stations, the first channel using the access method and transmission protocol of the CAN specification or the extension thereof, the TTCAN specification, the access to the second channel being controlled according to an arbitrary access method, and first data to be transmitted via the first channel and second data to be transmitted via the second channel being transmitted via a joint signal line, and a data signal being formed as a function of the first data, and a modulation signal being formed as a function of the first and second data, and the modulation signal being superposed on the data signal.
摘要:
A method for controlling access to data of a message memory, and a message handler of a communications module having a message memory, in which data are input or output in response to an access; the message memory being connected to a first buffer configuration and a second buffer configuration, and the data being accessed via the first or the second buffer configuration; in the message handler, at least one first finite state machine being provided which controls the access to the message memory via the first buffer configuration, and at least one second finite state machine being provided which controls the access via the second buffer configuration, the at least one first finite state machine and the second finite state machine making access requests; and a third finite state machine being provided which assigns access to the message memory to the at least one first and the second finite state machine as a function of their access requests.
摘要:
A communication interface element for a communication module is provided, which module contains a message memory and a first data path to and from the message memory via which data and/or messages are transmitted to and from the message memory. The communication interface element provides an additional, second data path in the communication module and includes switching arrangement configured in such a way that predefinable data and/or messages of the first data path are transmitted over the additional, second data path.
摘要:
A method and system of communication capable of expediting a calibration process which requires a data bus, multiple user nodes connected to the data bus, and data frames for data transmission that each include a data field and/or a control field and a check sum field. One user has a high-precision clock generator, and the remaining users have a clock generator having a lower precision. The users having the lower precision clock generator calibrate the lower precision clock generator to a system clock signal of the data bus, taking into account information contained in received calibration messages already present on the data bus. Expedited calibration requires the system clock signal period to be set according to a series of measurements and uses any given messages transmitted via the data bus as calibration messages, thus conserving bandwidth on the data bus.