c51下的一个键盘程序，用循环轮训法检测是否有键按下。

一个在skyeye下用uboot启动的helloworld小程序-A skyeye start using uboot applet helloworld

中兴MG815+CDMA模块USB转接原理图及PCB图（基于CP2102的USB TO RS232转接原理-ZTE MG815+ CDMA module USB adapter and the PCB schematic diagram (based on the CP2102

FLASH文件系统的源码，Flash memory is a nonvolatile memory, which allows the user to electrically program (write) and erase information. The exponential growth of flash memory has made this technology an indispensable part of hundreds of millions of electronic devices. Flash memory has several significant differences with volatile (RAM) memory and hard drive technologies which requires unique software drivers and file systems. This paper provides an overview of file systems for flash memory and focuses on the unique software requirements of flash memory devices. -FLASH file system source code, Flash memory is a nonvolatile memory, which allows the user to electrically program (write) and erase information. The exponential growth of flash memory has made this technology an indispensable part of hundreds of millions of electronic devices. Flash memory has several significant differences with volatile (RAM) memory and hard drive technologies which requires unique

基于GPS和GSM的车辆安全和事故警报系统

定时器的应用 本程序简单的示范了如何使用ATMEGA16的定时器 AVR定时器的要点介绍 T0工作于CTC模式，输出1KHz/2KHz 50％占空比的方波 T1工作于快速PWM模式兼输入捕捉 T2工作于相位修正PWM模式，输出490Hz的8bit PWM波 -Application Timer simple demonstration of this procedure how to use the ATmega16 timers AVR timer T0 introduce the main points of work in CTC mode, the output 1KHz/2KHz 50 duty cycle square wave T1 work in fast PWM mode Input Capture and T2 work on phase-corrected PWM mode, the output of 8bit PWM wave 490Hz

51单片机PID计算程序，执行时间短，有详细的说明，能适于大多数PID自动控制场合，-51 SCM PID calculation procedures, the time is short, a detailed description can apply to most occasions, PID control,

支持ttf字体转换的工具-support ttf font conversion tools

基于５１单片机的LCD1602显示-Based on 51 Singlechip LCD1602 display

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博创ARM3000原理图，以及最小系统，包括AD,DA,LCD,键盘，以及常用外围设备-ARM3000 Fiberxon schematics, as well as the smallest system, including AD, DA, LCD, keyboard, and peripheral equipment used