CAN filter merging method and device and CAN controller

Abstract

The embodiment of the invention relates to the technical field of electronic information. The invention discloses a CAN filter merging method. The CAN filter comprises a special filter and at least one common filter, the special filter comprises a mask and at least two filtering codes; the common filter comprises a mask and a filter code; the method comprises the following steps: firstly, initializing a mask and a filtering code of a special filter; obtaining a first total number of filtering codes in the special filter; and, a second total number of common filters, obtaining masks and filtering codes of all common filters; based on the first total number, the second total number; masks and filtering codes of all common filters are used; according to the method for merging the CAN filters,the masks and the filtering codes of the special filters are adjusted, so that data correspondingly passing through all the common filters can pass through the special filters, the burden of a processor can be reduced, the situation that a CAN controller processes a large amount of irrelevant data is avoided, and the communication speed is increased.

Description

technical field [0001] The embodiment of the present invention relates to the field of electronic information technology, in particular to a method and device for combining CAN filters and a CAN controller. Background technique [0002] In the scenario of communication based on the CAN bus, it generally involves filtering the data of the bus, usually by setting the mask and filter code of the filter in the CAN controller to match the identifier of the data to realize the function of data filtering. [0003] In the process of realizing the embodiment of the present invention, the inventor found that there are at least the following problems in the above related technologies: the filter in the existing CAN controller, the number of filter codes that can be assigned is fixed, and the irrelevant data that needs to be filtered When there are many types, it can only be filtered by software filtering, which will increase the burden on the processor and slow down the communication s...

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Problems solved by technology

[0003] In the process of realizing the embodiment of the present invention, the inventor found that there are at least the following problems in the above related technologies: the filter in the existing CAN controller, the number of filter codes that can be assigned is fixed, and the irrelevant data that needs to be filtered When there are many types, it can only be filtered by software filtering, which will increase the burden on the processor and slow down the communication speed.

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