AT91RM9200的RTC测试程序，本程序以成功在我的AT91RM9200试验板上跑通...

16c550驱动程序；适用于16c550 from philips 这是一个简单的例子，ns提供-16c550 driver; Is suitable to 16c550 from philips this is a simple example, ns provides

深圳远峰PXA255开发板BSP，商用的，相关项目的板子可以参考。-The bsp of the intel pxa255 .

基于samsung　s3c44b0x　的mp3播放程序源代码，编译环境：windows + ads1.2，具有很高的参考价值-based on the MP3 player source code, compile environment : windows ads1.2 with very high reference value

atmel sam7a3 串口 pdc keil下成功运行 可在7a3 开发板上运行，并且带有闪灯程序-pdc serial atmel sam7a3

在WINCE6.0环境调试开发的ARM9-2440硬件串口通信程序，嵌入式ARM接受2串口，发送1串口数据，适时监控下位机发送的轮胎电压温度气压数据，经适时处理分析在7寸界面显示个车厢轮胎的状态信息，源码调试通过并在轻轨车上运行

运算放大器基础，为PDG格式，是最让人头疼的格式，不过还是可以一看-Operational Amplifiers basis for PDG format, is the most worrisome format, but one can still see

飞利浦LPC系列ARM7 LCM12864点阵液晶演示程序 永探电子开发板-Philips LPC series ARM7 LCM12864 dot matrix LCD demo program permanent exploration of electronic development board

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.

EasyARM2131开发板源码之一-----------2．GPIO输出实验－单路LED控制-EasyARM2131 one source development board----------- 2. GPIO output experiment- one-way LED control