基于8051通过串口测试4*4矩阵键盘，通过键盘按键发送A-F字符到串口调试助手。本程序可通过加LCD1602接受串口发送过来的数据。-Based on 8051 through the serial port test 4* 4 matrix keyboard, the keyboard keys send characters to the serial debug AF assistant. This program can be sent by Canada LCD1602 receiv

8051串口测试程序，可以在硬件开发过程做测试8051单片机串口工作是否正常-8051 serial test procedure, the test can be done in hardware development process 8051 serial port is working properly

使用SL811+8051平台实现的USB HOST测试仪器，可以测试各种USB 设备的，支持最多2级HUB，带LCD显示屏，已经被大量生成使用；使用C语言开发，方便移植到 主流STM32F 平台。(USB HOST testing instrument using SL811+8051 platform can test all kinds of USB devices, support up to 2 HUB and LCD display, and have been used in lar