In order to thoroughly understand what makes Linux tick and why it works so well on a wide variety of systems, you need to delve deep into the heart of the kernel. The kernel handles all interactions between the CPU and the external world, and determines which programs will share processor time, in what order. It manages limited memory so well that hundreds of processes can share the system efficiently, and expertly organizes data transfers so that the CPU isn t kept waiting any longer than necessary for the relatively slow disks.
标签： thoroughly understand variety order
上传时间： 2014-12-06
上传用户：PresidentHuang
1. UC/OS 8051中完全应用。 2. 显示各个任务的执行时间, 执行时间占总时间百分比, tick计数器 3.任务中信号量,消息以及消息队列的使用。 我自己仔细测试过了，运行了一天都没有出问题。请大家一起使用，有问题请及时联系我们 附带在proteus上面进行仿真，免去各位朋友硬件上烦恼。
上传时间： 2014-09-01
上传用户：baitouyu
UCOS/II for ICCAVR - The version of UCOS/II is 2.04 - the original port was done by Ole Saether for the IAR compiler. Jens E. Holtegaard ported one version using ICCAVR. Joerg Meyer did another port (using Jens port as a start?). This is basically Joerg s port plus a little bit of changes and documentation by me. - YOU MUST DOWNLOAD THE MAIN PART OF THE UCOS/II FROM THE UCOS/II WEBSITE http://www.ucos-ii.com . The supplied project file assumes the portable source is in the ..\source directory. - Joerg has written couple document showing the stack frames etc. but it is in German :-) They are included in this directory. - The Timer2 overflow interrupt is used for Timer tick. If you want to change that, modify os_cpu_c.c and os_cpu_a.s - I have tested this using ATMega103 with and without external RAM using AVR Studio simulator. See test1.c test program. Both Code Compressed (PRO) and STD versions have been tested.
标签： UCOS original Saether version
上传时间： 2015-11-14
上传用户：ippler8
内核超时等待机制的原理: 应用程序通过操作系统提供的系统调用接口获取资源时，在系统调用的入口参数里可以指定超时等待的最大时间，通常以毫秒为单位，内核会将其转化为系统的时钟（tick）
上传时间： 2015-12-10
上传用户：frank1234
The secret cipher that secures Mifare Classic RFID tags used in access control systems, subway tickets, and various other security-related applications has recently been disclosed
标签： Classic control secures systems
上传时间： 2017-03-22
上传用户：黄华强
1. This BSP can support 2443EVT0 board. If you want to use EVT0 BSP, set followings. In smdk2443\smdk2443.bat file set BSP_EVT1=1 -> set BSP_EVT1= In smdk2443\src\inc\bsp_cfg.h file #define EVT1 -> #define EVT0 2. Default system tick mode is changed. The value is fixed tick. Fixed tick means that tick interrupt is occurred every 1ms. Variable tick means that timer interrupt period is changed when power mode is in idle. For changing to variable tick In smdk2443\src\inc\bsp_cfg.h file #define FIXEDtick -> #define VARtick In smdk2443\src\Common\Timer\Sources file SOURCES= timer_fixedtick.c watchdog.c -> SOURCES= timer_vartick.c watchdog.c
标签： EVT0 followings BSP support
上传时间： 2014-01-27
上传用户：fnhhs
You may read code because you have to-to fix it, inspect it, or improve it. You may read code the way an engineer examines a machine--to discover what makes it tick. Or you may read code because you are scavenging--looking for material to reuse. Code-reading requires its own set of skills, and the ability to determine which technique you use when is crucial. In this indispensable book, Diomidis Spinellis uses more than 600 real-world examples to show you how to identify good (and bad) code: how to read it, what to look for, and how to use this knowledge to improve your own code. Fact: If you make a habit of reading good code, you will write better code yourself.
上传时间： 2017-08-13
上传用户：jyycc
rt-thread的定时器的基本工作原理在RT-Thread定时器模块维护两个重要的全局变量，一个是当前系统的时间rt_tick（当硬件定时器中断来临时，它将加1），另一个是定时器链表rt_timer_list，系统中新创建的定时期都会被以排序的方式插入到rt_timer_list（硬件定时器模式下使用）链表中，rt_timer_list的每个节点保留了一个定时器的信息，并且在这个节点加入链表时就计算好了产生时间到达时的时间点，即tick，在rt-thread系统中如果采用软件定时器模式，则存在一定时器线程rt_thread_timer_entry，不断获取当前tick值并与定时器链表rt_timer_list上的定时器对比判断是否时间已到，一旦发现就调用对应的回调函数，即事件处理函数进行处理，而如果采用硬件定时器管理模式的话，则该检查过程放到系统时钟中断例程中进行处理，此时，是不存在定时器线程的。如下图：注：如果采用软件定时器软件定时器，则该定时器链表为rt soft_timer_list。
上传时间： 2022-06-24
上传用户：jason_vip1
VIP专区-嵌入式/单片机编程源码精选合集系列（149）资源包含以下内容：1. 51+lcd1602显示,程序非常清晰明白,很适合初学者!.2. 1. UC/OS 8051中完全应用。 2. 显示各个任务的执行时间, 执行时间占总时间百分比, tick计数器 3.任务中信号量,消息以及消息队列的使用。 我自己仔细测试过了.3. 实例仿真原理图和结果.4. 富士N系列可编程控制器PLC编程手册,介绍Flex N系列PLC的情况和其操作。.5. apr9600简介.6. Microsoft Extensible Firmware Initiative FAT32 File System Specification.7. 用于嵌入式驱动编程学习的一本经典的教材.8. small rtos 1.20 一套单片机嵌入式操作系统,由陈明计开发.9. WIFI driver from marvell website, 8.70 for gspi..10. WIFI driver from marvell website, 7.73 for sdio..11. 关于USB的相关芯片的应用说明.12. 关于基本嵌入式系统介绍和c语言编程的书籍.13. 61编的12864程序 有的12864可能有问题.14. PLC控制日本安川伺服电机的源程序。控制方式为串口控制.15. 精品资料-嵌入式系统经典教材 系统讲解了嵌入式开发.16. tms320c2812的flash驱动程序.17. This is a document for CYCLONE Develop Kits type LJ-FN300 FPGANIOS. Wish this would help you to find.18. 基于NuCleus操作系统下的一个GUI界面.19. 用三星的44b0控制的zlg7290的源码.20. 三星的44b0的完整启动程序 启动后让几个led闪烁.21. ID卡门禁系统.22. PIC单片机产生警报声的程序。频率从1.8K-3.5K匀速增加.23. PCI总线操作的相关内容.24. 一个电子表程序.25. msp430单片机的lcd显示程序 可形成循坏显示功能.26. 车辆检测通过的电路原理图.27. 电能计量芯片SA9904的读写程序.28. FS9315核心板和底板原理图.29. FPGA.30. 这是is4002语音芯片的录放音程序.31. 远程采集系统嵌入式WEB端java applet动态曲线显示采集量的代码.32. GUI入门的好教材, 可以配套ARM使用, 内含有一些地层的初级函数和硬件接口..33. 基于ATmega16的BC7281键盘显示源码,拿过来就 可以用.34. 基于ATMEGA16的时钟芯片原代码.35. 基于ATMEGA16的温度传感器原代码.36. 基于ATmega16的12864液晶显示源代码.37. 基于ATMEGA16的NRF905无线通信的C程序源代码.38. 基于ATMEGA16的AD转换的C程序源代码.39. 基于ATMEGA16的DA转换的C程序源代码.40. 基于ＡＴＭＥＧＡ１６的步进电机的驱动程序.
上传时间： 2013-06-18
上传用户：eeworm
