Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (3): 24-30.doi: 10.6040/j.issn.1672-3961.0.2019.705

• Machine Learning & Data Mining • Previous Articles     Next Articles

A multi-microcontroller communication method based on UART asynchronous serial communication protocol

Jinping MA()   

  1. School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2019-11-19 Online:2020-06-20 Published:2020-06-16
  • Supported by:
    国家科技部创新方法工作专项资助项目(2017IM030100)

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Abstract:

To reduce the additional communication modules, complexity and costs of the different Internet of Things(IoT) devices communication, a multi-microcontroller communication method based on UART asynchronous serial ports was proposed. Based on the universal asynchronous receiver/transmitter(UART) serial communication method of the microcontroller, the control line was utilized to control the usage of the communication lines by the communication device, and a method of occupying the signal line by multiple machines in a time-sharing manner was realized. The master-slave control strategy was used to set the communication protocol. The master implements signal forwarding and identification, and the slave got signals from the master to achieve reliable and stable communication among multiple machines. By transplanting the μC/OS-Ⅱ operating system to the STM32 microcontroller, and using the real-time multitasking characteristics of μC/OS-Ⅱ, the signal reception, transmission and identification were designed into tasks of different priorities, and the master and the slave were realized. The functions of information receiving, sending and identification and the characteristics of multi-slave expansion were achieved through the communication protocol, solving the problem of multi-microcontroller communication that the traditional UART method could not achieve. The feasibility of the proposed method was verified through experiments, which provided a new solution for multi-microcontroller communication of edge devices in the Internet of Things.

Key words: serial port, multi-microcontroller communication, communication protocol, microcontroller, embedded systems

CLC Number: 

  • TP391.8

Fig.1

Connection schematic diagram between master and slaves"

Fig.2

Comparison of TLL and RS-232 level"

Table 1

Communication protocol structure betweenmaster and slave bit"

数据 长度
信号头 8
通讯类型 8
源地址 8
目标地址 8
帧长度 7
奇偶校验 1
信号结尾 32
信号内容 0~920

Fig.3

Task scheduling principle of μC/OS-Ⅱ"

Fig.4

Microcomputer core board structure"

Fig.5

Chip of TTL to RS-232"

Fig.6

Wirings layout of master and slave"

Table 2

Test protocol encoding"

数据 数值
信号头 AA
通讯类型 00
源地址 **
目标地址 **
帧长度 0B
奇偶校验 **
信号结尾 CC 33 3C C3
信号内容 01

Fig.7

Message received by master and slaves"

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