Serial communication protocol for controller

Abstract

The invention discloses a serial communication protocol for a controller. The serial communication protocol comprises the following steps of: 1, for a master machine, preparing application layer data through the master machine, transmitting data to a slave machine, waiting an acknowledgement signal of the slave machine, retransmitting the data if the received signal comes from an unexpected slave machine, retransmitting the data if the inter-frame overtime or intra-frame overtime is generated, retransmitting the data if the acknowledgement signal is NAK, and finishing the operation if the acknowledgement signal is ACK; and 2, for the slave machine, receiving the data transmitted by the master machine, not responding and receiving the data again if the slave machine is busy, not responding and receiving the data again if the received data are nonnative identification (ID) data, receiving the data again if intra-frame overtime is generated, transmitting the NAK acknowledgement signal to the master machine if the data verification is wrong, and processing the application layer data and transmitting the ACK if the verification is successful. The serial communication protocol for the controller aims to overcome defects in the prior art, is stable in communication and can simplify task load of a microprocessor.

Description

technical field [0001] The invention relates to the field of serial port communication, more specifically, relates to a serial port communication protocol suitable for motor controllers. Background technique [0002] The universal serial communication system is widely used in various single-chip microcomputer systems because of its simple interface and flexible expansion. However, because the operating frequency of the single-chip itself is generally low and the processing speed is slow. In the case of unreliable communication, if the communication protocol is too simple, the transmission of multi-byte data and the accuracy of the data cannot be guaranteed. In order to solve this problem, the existing serial communication protocols usually improve the stability by increasing the complexity of the protocol and tasks of the receiving end and the sending end, and the communication protocol that is too complicated must occupy more microprocessors The processing time and storage...

AI Technical Summary

Problems solved by technology

[0002] The universal serial communication system is widely used in various single-chip microcomputer systems because of its simple interface and flexible expansion. However, because the operating frequency of the single-chip itself is generally low and the processing speed is slow. In the case of unreliable communication, if the communication protocol is too simple, the transmission of multi-byte data and the accuracy of the data cannot be guaranteed

In order to solve this problem, the existing serial communication protocols usually improve stability by increasing the protocol and task complexity of the receiving end and the sending end, and an overly complex communication protocol must occupy more microprocessors. The processing time and storage unit, so that in order to run the traditional serial communication protocol, it is necessary to select a relatively high-end microprocessor, or add an auxiliary microprocessor for communication, thereby increasing the manufacturing cost of the serial communication system

Moreover, in traditional communication protocols, it is difficult to take into account the characteristics of microprocessors in products such as motor controllers, resulting in off-the-shelf protocols that cannot be applied to microprocessors in such products

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