u盘开发源代码，以经过调试，希望对大家有用

DM6713的BIOS程序-mentest 内存分配-DM6713 the BIOS memory allocation procedures-mentest

点阵显示，通过595通讯芯片，达到32×80的刷屏效果，但是刷新频率有些慢。-Dot-matrix display, through the 595 communications chip, reaching 32 × 80 of刷屏effects, but some slow refresh rate.

C8051F 读写24C01 使用SMBus硬件端口-c8051f read and write 24c01 with smbus port.

主要用于电动自行车的电机控制，调速系统。实现无霍尔，有霍尔切换。速度转速双闭环控制。

博创UP-NETARM2410-S实验箱源码：Exp7 can总线通讯实验-Fiberxon UP-NETARM2410-S experimental box source: Exp7 can bus communication experiment

这是一个不到2000行的操作系统，巧妙地利用ARM9 CPU的内存管理单元(MMU)实现进程的切换。ARM9的4G虚拟地址可分成128个进程空间，每个32M。虽然它们的虚拟地址(VA)都是0-(32M-1)，但是对应的MVA(Modified vitual address,由虚拟地址VA和进程号PID组合而来)不一样，设置MVA对应的页表指向不同物理地址就可以很方便地让各进程运行空间相互隔开。代码很少，注释丰富，希望能对想理解操作系统、了解ARM体系结构的朋友有所帮助。 -This is a trip of less than 2000 operating system, cleverly using ARM9 CPU memory management unit (MMU) to achieve the switching process. ARM9 4G virtual address can be divided into 128 process space, each 32M. While their virtual address (VA) are 0- (32M-1), but the corresponding MVA (Modified Virtual address, and by the virtual address VA and the process of portfolio from PID) not the same, set MVA corresponding page table at the different physical address can be very easy to let the the process of separating the mutual operation of space. Code rarely Notes rich, in hopes of understanding the operating system, understanding the ARM architecture friends help.

Micro controller based digital clock with alarm

常用的运算放大器需要的是正负电源，但是如果你的系统只能提供单一的电源的话，为了能够使你的运放正常工作，推荐看看这个资料-common Operational Amplifiers need is plus or minus power, but if your system can only provide a single power supply, in order to make your Mancin normal work, recommend a look at this information

mc9s12xep100 模拟eeprom程序-mc9s12xep100 Emulated EEPROM

STM32F103 RTC 日期程序驱动  #include "rtc.h" const DateTimeType MinDateTime = {     10, 1, 1, 0, 0, 0 }; const DateTimeType MaxDateTime = {     99, 12, 31, 23, 59, 59 };