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Baud rate acquiring method and device

A baud rate, to-be-tested technology, applied in the directions of transportation and packaging, registration/indication of vehicle operation, registration/indication, etc., can solve problems such as long system entry time and poor CAN bus stability

Active Publication Date: 2019-04-19
AUTEL INTELLIGENT TECHNOLOGY CORP LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and device for obtaining the baud rate, so as to solve the problems of poor stability of the CAN bus and long system entry time in the related art when obtaining the baud rate of the CAN bus

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  • Baud rate acquiring method and device

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Embodiment Construction

[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0047] It should be noted that, if there is no conflict, various features in the embodiments of the present invention can be combined with each other, and all of them are within the protection scope of the present invention. In addition, although the functional modules are divided into the schematic diagram of the device, and the logical order is shown in the flowchart, in some cases, the division of modules in the schematic diagram of the device, or the sequence in the flowchart may be executed. steps shown or described.

[0048] see figure 1 , figure 1 It is a schematic structural diagram of a...

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Abstract

The invention relates to the technical field of industrial field bus communication, in particular to a Baud rate acquiring method and device. The method comprises the steps that a monitoring mode is started; a detection signal from an automobile electronic control unit is monitored in the monitoring mode; at least one to-be-tested Baud rate related to the detection signal is determined; the detection signal is sequentially analyzed by utilizing the to-be-tested Baud rates; when the detection signal is correctly analyzed through a certain to-be-tested Baud rate in the to-be-tested Baud rates, it is determined that the to-be-tested Baud rate is the Baud rate corresponding to the automobile electronic control unit. According to the method, CAN bus data is received by adopting the specific Baud rate, and no waveform data is actively sent to a CAN bus in the whole process, so that the stability of the CAN bus is guaranteed; in addition, the identification work of the Baud rate of the CAN bus is independently completed through automobile communication interface equipment, so that the access time of a system is shortened during link communication.

Description

【Technical field】 [0001] The invention relates to the technical field of industrial field bus communication, in particular to a method and a device for obtaining a baud rate. 【Background technique】 [0002] At present, the controller area network (ControllerAreaNetwork, CAN) bus protocol has become a standard bus for automotive computer control systems and embedded industrial control area networks. Various operating systems have integrated many board-level support packages, and many manufacturers have provided corresponding board-level drivers, as well as support for the CAN bus protocol and CAN device drivers in the form of character devices. However, the baud rate of the CAN bus is not unique. When the baud rate of the CAN bus does not match that of a certain CAN device, normal communication cannot be performed. When the vehicle and the vehicle diagnostic equipment communicate with each other through the CAN bus, they also need to have the same baud rate. In practical ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/042
CPCG05B19/0428G05B2219/24024G05B19/0425G05B2219/2637G07C5/008G07C2205/02B60R16/0232G07C5/0808
Inventor 彭志兵
Owner AUTEL INTELLIGENT TECHNOLOGY CORP LTD
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