some pdf files describing about PLC concepts and components.

PLC控制日本安川伺服电机的源程序。控制方式为串口控制，按顺序发送相应指令。-PLC Yaskawa Japan servo motor control of the source. Control mode for the serial control, according to the order to send the corresponding commands.

硬盘MP3的源程序--Source code for hard disk MP3.

软件I2C 驱动--Software driven I2C.

这个是STM32F4x7   V1.1.0   LwIP  V1.4.1 ， 含有文件系统。本程序包含两种模式，带RTOS与裸跑模式，支持TCP，UDP等Server端与客户端程序，并附带回调例程。

RTL8029AS PCI 10M网卡双端口电路图-RTL8029AS PCI 10M NIC dual-port circuit

This file contains the following sections: 1. Code Example Description 2. Folder Contents 3. Suggested Development Resources 4. Reconfiguring the project for a different PIC18F device 5. Revision History

mpc2872系列的usb controller产生sof源码-mpc2872 series have a usb controller source sof

基于单片机AT89S52的LCD液晶显示程序-Based on MCU AT89S52 the LCD liquid crystal display procedures

采用KEIL MDK开发环境，实现USB下的大容量U盘驱动程序，内附全部源码，欢迎交流！-Using KEIL MDK development environment to achieve large-capacity USB under the U disk driver, included all the source code, please share!

这个是用常见的51系列单片机设计的 控制电机驱动芯片的程序，程序简单适用，而却有些特殊的好处就是，初学者特别好懂！大家赶紧下来-This is common with the design of 51 series single-chip motor driver chip to control the process, the application of simple procedures, and has some special benefits is particularly good for beginners to understand! We rushed down to see