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Method and device for serial data transmission having a flexible message size and a variable bit length

A technology of serial data and message, applied in the field of serial data transmission

Active Publication Date: 2014-05-28
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] It has been shown that existing techniques do not provide satisfactory results in every respect

Method used

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  • Method and device for serial data transmission having a flexible message size and a variable bit length
  • Method and device for serial data transmission having a flexible message size and a variable bit length
  • Method and device for serial data transmission having a flexible message size and a variable bit length

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Embodiment Construction

[0030]exist Figure 1a The structure of the messages as used for data transmission on the CAN bus is shown in . Two different formats "standard" and "extended" are shown. The method according to the invention can be applied to both formats in a suitable embodiment.

[0031] The message begins with a "Start of Frame" (SOF) bit, which signals the start of the message. This is followed by a section which initially identifies the message and on the basis of which the user of the bus system decides whether he will accept the message. This section is denoted by "Arbitration Field" and contains an identifier. This is followed by the "Control Field", which contains, inter alia, the data length code. The data length code contains information about the size of the data field of the message. This is followed by the actual data field "Data Field", which contains the data to be exchanged between the subscribers of the bus system. This is followed by a "CRC Field" with a checksum and d...

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Abstract

The invention relates to a method for serial data transmission in a bus system having at least two bus nodes, which exchange messages by means of the bus, wherein the sent messages have a logical structure as per CAN standard ISO 11898-1, wherein the control field of the messages comprises more than six bits, in deviation from CAN standard ISO 11898-1, if a first marker (EDL) is present and the data field of the messages can comprise more than eight bytes, in deviation from CAN standard ISO 11898-1, if the first marker (EDL) is present, wherein the values of the four bits of the data length code are interpreted at least partially in deviation from CAN standard ISO 11898-1 in order to determine the size of the data field, and wherein if a second marker (BRS) is present, the bit length for at least one specified or specifiable range within the message assumes a value that is shortened compared to the bit length used before the presence of the second marker, wherein the range begins with the second marker at the earliest and ends with the CRC delimiter at the latest and the second marker (BRS) appears only if the first marker (EDL) is present and occurs in the control field of the messages that comprises more than six bits in deviation from CAN standard ISO 11898-1.

Description

technical field [0001] The invention relates to a method and a device for serial data transmission between at least two bus users in a serial bus system. Background technique [0002] For example, the standards from the family ISO11898-1 to -5 are known as the Controller Area Network (CAN) and the extension of CAN known as “Time Triggered CAN” (TTCAN), hereinafter also referred to as Standard CAN. The medium access control method used in CAN is based on bit-by-bit arbitration. With bit-by-bit arbitration, several subscriber stations can simultaneously transmit data via the channels of the bus system without thereby interfering with the data transmission. Furthermore, the subscriber station can determine the logical state (0 or 1) of the channel when it transmits a bit over the channel. If the value of the transmitted bit does not correspond to the determined logical state of the channel, the subscriber station ends access to the channel. Bit-by-bit arbitration in CAN is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/42H04L12/413H04L47/36
CPCG06F13/4291H04L2012/40215H04L12/40169H04L2001/0094H04L47/36G06F13/4282H04L1/0083
Inventor F·哈特维希C·霍斯特
Owner ROBERT BOSCH GMBH
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