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Method and device for serial data transmission which is adapted to memory sizes

A technology of serial data and memory, applied in the field of serial data transmission and equipment matching with the size of the memory, can solve the problem of not providing satisfactory results, and achieve the effect of maintaining security

Active Publication Date: 2014-03-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that existing techniques do not provide satisfactory results in every aspect

Method used

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  • Method and device for serial data transmission which is adapted to memory sizes
  • Method and device for serial data transmission which is adapted to memory sizes
  • Method and device for serial data transmission which is adapted to memory sizes

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Embodiment Construction

[0033] Figure 1a The message structure 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 also be applied to both formats.

[0034] A message begins with a "Start of Frame" (SOF) bit, which signals the start of the message. This is followed by a segment mainly for message identification, on the basis of which the user of the bus system decides whether he has received the message. The segment is denoted by an "arbitration field" and contains an identifier. This is followed by a "control field" which contains, inter alia, a 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 15-bit checksum and a delimiter, and followed by two "ackno...

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Abstract

The invention relates to a method for serial data transmission in a bus system with at least two participating data processing units, the data processing units exchanging messages via the bus, wherein the transmitted messages have a logic structure according to CAN Standard ISO 11898-1. In the event of a first switching condition, the data field of the messages can comprise, in a deviation from CAN Standard ISO 11898-1, more than 8 bytes, wherein the values of the data length code are interpreted at least partially in deviation from CAN Standard ISO 11898-1 for determining the size of the data field in the event of the first switching condition. At least one buffer memory is provided for transmitting data between the data field and the application software, and the transmitted quantity of data is at least adapted in accordance with the size difference between data field and used buffer memory when the size of the data field differs from that of the used buffer memory.

Description

technical field [0001] The invention relates to a method and a device for serial data transmission between at least two subscribers in a serial bus system adapted to the memory size. Background technique [0002] For example, the ISO 11898-1 to 11898-5 family of standards known the Controller Area Network (CAN) and the CAN extension called "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. In addition, a subscriber station can ascertain the logical state (0 or 1) of the channel when transmitting bits over the channel. If the value of the transmitted bit does not correspond to the ascertained logical state of the channel, the subscriber station terminates the access to the channel. In the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/42H04L12/413H04L45/74
CPCH04L45/74H04L2012/40215G06F5/065H04L12/4135H04L12/40013G06F13/4282H04L12/413G06F13/42
Inventor F·哈特维希
Owner ROBERT BOSCH GMBH