TTCAN bus timing and data transmitting method

Abstract

The invention belongs to the technical field of information communication and particularly relates to a TTCAN bus timing and data transmitting method. According to the technical scheme, the method is applied to TTCAN bus time receiving host time node timing information from nodes, system operation time can be distributed reasonably in the process of transmitting the information is a timing manner in a matrix cycle, accurate bus node timing can be implemented, bus data can be transmitted regularly in the prescribed time slice, and other system functions can be completed in the idle time slice. A timer T0 with higher priority is interrupted internally through a single-chip microcomputer or DSP, the errors of the bus timing time can be avoided since interruption caused by other interruption with the lower priority is avoided during interruption, bus timing and bus data transmitting functions according to the matrix cycle can be implemented in the T0 interruption process, and the other system functions can be completed in the idle time slice; interruption number is decreased, and system logic confusion caused by large amount of nested interruptions can be avoided.

Description

technical field [0001] The invention belongs to the technical field of information communication, and in particular relates to a method for timing and sending data by a TTCAN bus. Background technique [0002] Since the invention of CAN bus technology by German BOSCH company in the 1980s, CAN bus, as a network communication control method, has been widely used in automobiles, aviation, industrial control, automatic control and other fields. With the gradual increase of nodes distributed in the communication network, the communication delay time caused by the priority arbitration mechanism of the bus increases. In order to solve the real-time requirements of bus communication, the international standard ISO 11898-4 is proposed in the session layer of the CAN protocol stack. A time-triggered communication protocol TTCAN is proposed. In the TTCAN communication network, the time master node periodically sends timing messages, and other time slave nodes receive timing messages a...

AI Technical Summary

Problems solved by technology

If the dual redundant channel A channel and B channel of the CAN bus need to occupy a dedicated timing interrupt respectively, receiving CAN bus data will also generate an interrupt, and in addition to implementing other functions in the program

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