keil c完成led阵列显示，循环显示。89c52验证。-keil c complete led array display, circular display. 89c52 verification.

该文件包含lcd1602驱动程序，rs232串口通信，环形缓冲数组。该程序为本人学生时期的练习习作。-This file contains lcd1602 driver, rs232 serial communication, a circular buffer array. During the program as my students practice exercises.

静态数组循环队列操作，并有多线程访问互斥机制。-Static array circular queue operation, and multiple threads to access the mutex mechanism.