CAN bus data transmission method

A data transmission method and CAN bus technology, applied in the field of CAN field bus data transmission, can solve the problems of reliable transmission of unfavorable spaceborne measurement and control data, large data blocks occupying bus bandwidth and communication time, etc., so as to improve robustness and save bus bandwidth , Improve the effect of transmission efficiency

Active Publication Date: 2010-06-30
AEROSPACE DONGFANGHONG SATELLITE
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AI Technical Summary

Problems solved by technology

However, resending all large data blocks requires bus bandwidth and communication time, which is not conducive to the reliable transmission of on-board measurement and control data.

Method used

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Embodiment Construction

[0035] The present invention as figure 1 As shown, it is realized through the following steps and described in conjunction with specific examples.

[0036] 1. Formulate the data frame format

[0037] The data sender divides the large data block to be transmitted into a multi-frame form of several data frames according to a specific frame format. The frame format is shown in Table 1. In the given multi-frame data format, ID10~ID9 is the basis for judging the priority of this frame. According to the arbitration mechanism stipulated in the CAN bus protocol standard, when data preemption occurs on the bus, "0 " has a higher priority than "1", so the first and last frames have higher priority than the second and third frames.

[0038]Each frame of data includes an arbitration field, a control field and an effective data field. Among them, the ID10 and ID9 bits of the arbitration field are the frame priority, and the ID8~ID3 bits are the frame sequence control fields, which are us...

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Abstract

A CAN bus data transmission method adopts the methods of dynamically changing frame priority, frame sequential control, a multiframe response mechanism, a multiframe selection strategy and the like to improve the reliability of CAN bus big data transmission; the priority of the first frame and the last frame of multiframe data is higher than common data, so the two frames can not be affected by the common multiframe data, and the normal receiving of important control information such as frame identity, frame length, frame check code and the like is ensured. For the multiframe response mechanism, frame head response and frame end response are added, so the effective receiving of the frame head, and the same time the condition that the frame head is error but continuously sends data is avoided, thus effectively saving the bus brad width, and improving the transmission efficiency; the frame end response contains error frame number, which makes the data transmitting terminal get the error frame number as quick as possible, so only the error frame number is re-sent, and the all the frame numbers are not needed to re-send to waste the bus band width. The invention greatly improves the reliability of receiving and sending of the CAN bus big data block, has a certain error detection and correction function, widens the application level of the CAN bus, and improves the robustness of the network system.

Description

technical field [0001] The invention relates to a CAN field bus data transmission method, in particular to a method for improving the reliability of CAN bus multi-frame data transmission by adopting multiple technologies such as dynamically changing priority, frame sequence control, and multi-frame response mechanism, and belongs to the technical field of data transmission. Background technique [0002] Because the CAN bus standard only stipulates the physical layer and the data link layer, the application layer part needs to be developed by itself. At present, the common practice of small satellites is to divide large blocks of data into smaller data blocks, and send small blocks of data separately, and the receiving end will receive all the data and splicing them into original data in sequence. This processing method is simple and practical, and is suitable for situations where the amount of data is small and the communication occasion is stable and reliable. Bit errors m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L1/00H04L29/08
Inventor 李国军谢松霍德聪
Owner AEROSPACE DONGFANGHONG SATELLITE
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