Method for simultaneous communication of double serial ports

Abstract

The invention provides a method for simultaneous communication of double serial ports. The method comprises steps of connecting a first serial port and a second serial port of a first Microprogrammed Control Unit (MCU) to a first serial port and a second serial port of a second MCU or the external first serial port and the external second serial port; detecting the working state of first serial ports and second serial ports by using a data request transmitting party when data are required to be transmitted; transmitting the data request through available ports by using the data request transmitting party in accordance with detection results; and receiving and processing the received data request by using a data receiving party. Two serial ports can conduct data communication at the same time and are independent, communication protocols of two serial ports are the consistent, the speed of serial ports and use efficiency of a central processing unit (CPU) are improved by one time, the stability of communication is greatly improved through double serial port communication, the communication is converted to one serial port when the other serial port goes wrong, and the testing efficiency of products can be improved.

Description

technical field [0001] The invention relates to serial port communication technology, in particular to a method for simultaneous communication of dual serial ports. Background technique [0002] Serial port communication is used for data transmission between MCU and MCU and between MCU and peripherals, and is widely used in the field of industrial communication. The so-called serial port communication refers to a communication method that transmits data bit by bit through data signal lines, bottom lines, control lines, etc. This communication method uses fewer data lines, which can save communication costs in long-distance communication. Among them, the RS-232 serial port communication method is widely accepted and used because of its standardized international standards, and has become a standard interface between devices with serial port communication functions. [0003] Industrial communication technology has become the most active branch in the field of modern automati...

AI Technical Summary

Problems solved by technology

However, there is only one full-duplex serial port in most MCUs, which cannot meet the needs of multi-MCU applications, nor can it make full use of the processing efficiency of the MCU. There are the following defects: slow transmission speed and low efficiency. This is the biggest defect of serial port communication. If it is changed to parallel communication, the cost will increase, and the distance is very short. If it is changed to USB, the cost will increase even more; if the serial port line is broken, the MCU cannot communicate with another MCU or peripherals normally; The communication is interrupted suddenly, and it is impossible to judge whether the MCU has stopped working or because the serial port communication is blocked.

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