A kind of ttcan bus time synchronization and method for sending data

Abstract

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. The method provided by the technical solution of the present invention is applied to the TTCAN bus time slave node to receive the time master node timing message, and in the process of sending the message regularly in the matrix cycle, the system working time can be reasonably allocated, and the bus node can be accurately timed and in the specified time. The bus data is sent periodically in the time slice, and other functions of the system are completed in the idle time slice. The present invention adopts the timer T0 interrupt with higher interrupt priority in the single-chip microcomputer or DSP, so when this interrupt is executed, it will not be interrupted by other low-priority interrupts to cause errors in the bus timing time, and only in the T0 interrupt process Complete the functions of bus time synchronization and sending bus data according to the matrix cycle, and realize other functions of the system in the idle time slice at the same time. Reduce the number of interrupts to avoid system logic confusion caused by more interrupt nesting.

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 that require timing, the program will generate more interrupts. The program will be interrupted in unknown circumstances, and the timing will be inaccurate under the nesting of multiple interrupts, which will seriously confuse the program logic

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