不管你是做软件的还是做硬件的，只要相中了ARM的Cortex-M3处理器，这本书就是
为你而写。目标读者包括：一线程序员，嵌入式产品设计师，片上系统（SoC）工程师，嵌入式系统发烧友，学院研究员，还包括所有涉猎过单片机和微处理器领域，慧眼识珍看中了Cortex-M3的人民大众们。
本书要给Cortex-M3的架构做一个简介，浏览一下指令系统，写几个段代码练练手，
说一些硬件特性，再表一表该处理器精深的调试系统。本书还给出了应用程序范例，手
把手地教你使用开发工具，包括ARM的工具和GNU的工具链。如果你以前是ARM7TDMI
的玩家，正准备着升级装备到Cortex-M3，本书也非常解渴，里面讲述了两者的不同，
以及鸟枪换炮的升级过程。
Whether you do software or hardware, as long as you like arm Cortex-M3 processor, this book is
Write for you. Target readers include: front-line programmers, embedded product designers, system on chip (SOC) engineers, embedded system enthusiasts, college researchers, as well as all the people who have been involved in the field of single chip microcomputer and microprocessor, and have a good eye for Cortex-M3.
This book will give a brief introduction to the architecture of Cortex-M3, browse the instruction system, write a few pieces of code to practice,
Some hardware features, and a table of the processor's deep debugging system. This book also gives examples of applications, hands
Hand to teach you to use development tools, including arm tools and GNU tool chain. If you used to be ARM7 TDMI
This book is also very thirsty. It describes the difference between the two,
As well as the upgrade process. (2020-11-24, Asm, 6023KB, 下载4次)
很老的东西，1993年左右的书，书的作者吕晓庆,通过一个将DOS POST到保护模式的开发环境,对了解保护模式有点参考价值,个人感觉这本
书里边的东西学起来比较顺手.直道现在也几乎没有见到像这本书这样介绍保护模式系统的书.
这本书上的代码有点错误.运行不起来.1998年左右我修改了下,可以用了.可以用这个代码来实作,段,页,多任务,模式切换.CPU异常等处理.
而且里边还带个最简单崩溃的调试器的代码，出现异常时候可以将当前的i386 寄存器给打印出来,
目录中的v86dos里边是v86DOS 玩具操作系统的代码,它将DOS 自举到虚拟86模式,并在之前初始化相关IA32保护模式资源.提供中断调用门,进入保护模式.
目录中的v86base 中是一些玩保护模式下功能调用V86DOS 玩具操作系统调用门的小代码.比如页错换页测试,双任务测试(一个在屏幕上
边打+,一个在屏幕下边打-),这个在DOS 时代确实还比较新鲜.估计这玩艺对了解保护模式可能有点意义,放在硬盘中
差点就把这个东西丢了,嘿嘿,现在放上来共享之.
Very old stuff , about 1993 books , author of the book Lv Xiaoqing , by a will to protected mode DOS POST development environment for understanding a bit protected mode reference value, this personal feeling
Inside the book to learn something more smoothly . Straights are almost not seen this book describes the book as protected mode system.
This book is a bit of code on error . Running up around .1998 I modified the next, can be used can be used to implement this code , section , page , multi-tasking, mode switching . CPU abnormal processing .
And inside also with the most simple code debugger crashes , abnormal when the current i386 can register to print out,
Directory v86dos is v86DOS toys inside the operating system code, it will bootstrap to a virtual 86 DOS mode and protected mode before initializing IA32-related resources . Provide an interrupt call gate , into protected mode.
Directory v86base is some play toys protected mode operating system function calls V86DO (2014-01-20, Asm, 72KB, 下载4次)
1.实现一个内存管理的伙伴算法，实现内存块申请时的分配和释放后的回收。
实验准备
用随机函数仿真进程进行内存申请，并且以较为随机的次序进行释放。对其碎片进行统计，当申请分配内存失败时区分实际空间不足和由于碎片而不能满足。
2.设计一个虚拟存储区和内存工作区，并使用下述算法计算访问命中率。
1) 最佳置换算法（Optimal）
2) 先进先出法（Fisrt In First Out）
3) 最近最久未使用（Least Recently Used）
4) 最不经常使用法（Least Frequently Used）
5) 最近未使用法（No Used Recently）
其中，命中率＝１－页面失效次数／页地址流长度。
试对上述算法的性能加以较各：页面个数和命中率间的关系；同样情况下的命中率比较。
1. A partner of the memory management algorithm to achieve a recovery after the application of the memory block allocation and release. Experimental preparation random function simulation process memory application, and released in a more random order. Statistics, when applications allocate memory failed to distinguish between the actual lack of space and because of the debris and can not meet its debris. Design a virtual memory storage area and workspace, access to the hit rate and use the following algorithm. 1) The best replacement algorithm (Optimal) 2) first-in, first-out method (Fisrt In First Out), 3) Recently the most-recently-used (Least Recently Used) 4) is not the most frequently used method (Least Frequently Used) 5) unused method recently (No Used Recently) which hit rate = 1- the number of page faults/page address stream length. The test of the performance of the above algorithm to be compared to the relationship between: page number and hit rate compare the hit rate in (2012-12-19, Asm, 133KB, 下载14次)
辅助说明：
代码交流 QQ59771230 email:choudaxian@163.com
注意事项：
1) LCD 指令中的TEXT GRAPHIC AREA SET效果是什么样的
2) LCD 指令中的MODE SET中的OR AND XOR 有图层的味道
3) DJNZ+指令C0H(DATA AND WRITE)与相同的数据时就会出错
4) CHAR ADN PIC分别清除
5) 几何图形绘制与实现图形
6) 菜单优化设计,结构体:上,下,上一组,下一组,指向函数的指针
显示的内容:
16*16汉字:欢迎使用福莱特电气有限公司产品
12*12汉字:进入主界面并且可以反显
8*8字符:FULL-RIGHT
并对所显示的汉字进行卷屏显示
关键是如何方便在屏上确定的位置上显示确定的汉字
要使占用ROM，RAM小的前提下
Help: code sharing QQ59771230 email: choudaxian@163.com Notes: 1) LCD command in TEXT GRAPHIC AREA SET What is the effect of 2) LCD of the MODE SET commands in the OR AND XOR has layers of flavor 3 ) DJNZ+ instructions C0H (DATA AND WRITE) with the same data when an error 4) CHAR ADN PIC, respectively, removal of 5) geometry rendering graphics and Implementation 6) menu to optimize the design, structure: the upper and lower, on a group of the next group of function pointer point to show the contents of: 16* 16 Chinese characters: Welcome to Follett Electrical Products Co., Ltd. 12* 12 Chinese characters: to enter the main interface and can be anti-significant 8* 8 characters: FULL-RIGHT and shown Volume of the Chinese characters for screen display key is how to make it easier to determine the location of screen display of Chinese characters to determine the occupation of ROM, RAM, under the premise of small (2008-12-03, Asm, 7KB, 下载8次)
汇编程序,完成如下功能:
每名学生需要如下描述：班级、学号、姓名、期末成绩、期中成绩、实验成绩、平时成绩。成绩可以有小数，如果有小数只能是点5，班级、学号、姓名格式自定。试编制一程序完成学生的录入和输出，输出的格式为：“班级、学号、姓名、总评成绩”，按照班级、学号进行排序，每人一行；最后再输出60以下、60-70、70-80、80－90、90-100分段内的人数。总评成绩的计算方法是：期末成绩×0.6＋期中成绩×0.2＋实验成绩*0.1＋平时成绩*0.1。
Compilation process, the completion of the following functions: the needs of each student described as follows: class, student number, name, the end results, interim results, the experimental results, achieved in peacetime. Results can be decimal, if there is decimal point can only be 5, classes, student number, name format custom. Test procedures to produce a completed student entry and output, the output format is: classes, student number, name, overall results , according to classes, school No. sort each party Finally, the output 60 the following 60-70, 70-80,80-90,90-100 subparagraph number. Overall performance is calculated by: × 0.6 at the end results during the performance test results × 0.2 * 0.1* 0.1 peacetime achievements. (2007-01-14, Asm, 25KB, 下载28次)