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基于以太网IC卡门禁控制的C++BUILDER程序-Ethernet-based IC card access control of the C++ BUILDER procedures

C8051F系列单片机SPI端口驱动程序，简洁，高效。-C8051F MCU SPI port drivers, simple and efficient.

硬件描述语言，对学习EDA的人，特别是初学者都有很大的参考价值。-hardware description language, to learn the EDA people, especially beginners have great reference value.

通过环路串口判断串行通信电平转换芯片功能是否正常，并通过读写DRAM 判断硬件。-Through the loop to determine serial communication serial port level translator chip features and whether it is normal, and through reading and writing DRAM hardware judge.

采用DDS 技术实现了基于DSP 的模拟调制实验模块。包括系统的硬件和软件设计,模拟调制原理,DSP实现模拟调制的方法,同时采用单象限正弦波形存储器结构对DDS 模块进行了改进,提高调制器的性能。-DDS technology using DSP-based implementation of the experimental module Analog modulation. Including system hardware and software design, analog modulation principle, DSP Analog modulation methods of implementation, while a single-quadrant sine wave-shaped structure of the DDS memory module has been improved to enhance the performance of modulator.

温度控制器：AT89C2051做数据处理和显示；18B20做测温-temperature controller : AT89C2051 do data processing and display; 18B20 do Temperature

串口测试程序，当收到一个数据时会返回一个同样的数据-Serial test procedure, when a data received will be a return of the same data

这是用AT89C2051单片机实现模数转换的源程序，程序由汇编语言编写-This is achieved using AT89C2051 mode conversion of the source, procedures prepared by the assembly language

CH375 主机文件系统接口(支持FAT12/FAT16) MCS-51单片机C语言的U盘文件读写示例程序-CH375 host file system interface (support FAT12/FAT16) MCS-51 single-chip U of C language sample programs to read and write disk files