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.
標簽： thoroughly understand variety order
上傳時間： 2014-12-07
上傳用戶：PresidentHuang
1. UC/OS 8051中完全應用。 2. 顯示各個任務的執行時間, 執行時間占總時間百分比, tick計數器 3.任務中信號量,消息以及消息隊列的使用。 我自己仔細測試過了，運行了一天都沒有出問題。請大家一起使用，有問題請及時聯系我們 附帶在proteus上面進行仿真，免去各位朋友硬件上煩惱。
上傳時間： 2014-09-01
上傳用戶：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.
標簽： UCOS original Saether version
上傳時間： 2015-11-14
上傳用戶：ippler8
內核超時等待機制的原理: 應用程序通過操作系統提供的系統調用接口獲取資源時，在系統調用的入口參數里可以指定超時等待的最大時間，通常以毫秒為單位，內核會將其轉化為系統的時鐘（tick）
上傳時間： 2015-12-11
上傳用戶：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
標簽： Classic control secures systems
上傳時間： 2017-03-22
上傳用戶：黃華強
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
標簽： EVT0 followings BSP support
上傳時間： 2014-01-27
上傳用戶：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.
上傳時間： 2017-08-13
上傳用戶：jyycc
rt-thread的定時器的基本工作原理在RT-Thread定時器模塊維護兩個重要的全局變量，一個是當前系統的時間rt_tick（當硬件定時器中斷來臨時，它將加1），另一個是定時器鏈表rt_timer_list，系統中新創建的定時期都會被以排序的方式插入到rt_timer_list（硬件定時器模式下使用）鏈表中，rt_timer_list的每個節點保留了一個定時器的信息，并且在這個節點加入鏈表時就計算好了產生時間到達時的時間點，即tick，在rt-thread系統中如果采用軟件定時器模式，則存在一定時器線程rt_thread_timer_entry，不斷獲取當前tick值并與定時器鏈表rt_timer_list上的定時器對比判斷是否時間已到，一旦發現就調用對應的回調函數，即事件處理函數進行處理，而如果采用硬件定時器管理模式的話，則該檢查過程放到系統時鐘中斷例程中進行處理，此時，是不存在定時器線程的。如下圖：注：如果采用軟件定時器軟件定時器，則該定時器鏈表為rt soft_timer_list。
上傳時間： 2022-06-25
上傳用戶：jason_vip1
VIP專區-嵌入式/單片機編程源碼精選合集系列（149）資源包含以下內容：1. 51+lcd1602顯示,程序非常清晰明白,很適合初學者!.2. 1. UC/OS 8051中完全應用。 2. 顯示各個任務的執行時間, 執行時間占總時間百分比, tick計數器 3.任務中信號量,消息以及消息隊列的使用。 我自己仔細測試過了.3. 實例仿真原理圖和結果.4. 富士N系列可編程控制器PLC編程手冊,介紹Flex N系列PLC的情況和其操作。.5. apr9600簡介.6. Microsoft Extensible Firmware Initiative FAT32 File System Specification.7. 用于嵌入式驅動編程學習的一本經典的教材.8. small rtos 1.20 一套單片機嵌入式操作系統,由陳明計開發.9. WIFI driver from marvell website, 8.70 for gspi..10. WIFI driver from marvell website, 7.73 for sdio..11. 關于USB的相關芯片的應用說明.12. 關于基本嵌入式系統介紹和c語言編程的書籍.13. 61編的12864程序 有的12864可能有問題.14. PLC控制日本安川伺服電機的源程序?？刂品绞綖榇诳刂?15. 精品資料-嵌入式系統經典教材 系統講解了嵌入式開發.16. tms320c2812的flash驅動程序.17. This is a document for CYCLONE Develop Kits type LJ-FN300 FPGANIOS. Wish this would help you to find.18. 基于NuCleus操作系統下的一個GUI界面.19. 用三星的44b0控制的zlg7290的源碼.20. 三星的44b0的完整啟動程序 啟動后讓幾個led閃爍.21. ID卡門禁系統.22. PIC單片機產生警報聲的程序。頻率從1.8K-3.5K勻速增加.23. PCI總線操作的相關內容.24. 一個電子表程序.25. msp430單片機的lcd顯示程序 可形成循壞顯示功能.26. 車輛檢測通過的電路原理圖.27. 電能計量芯片SA9904的讀寫程序.28. FS9315核心板和底板原理圖.29. FPGA.30. 這是is4002語音芯片的錄放音程序.31. 遠程采集系統嵌入式WEB端java applet動態曲線顯示采集量的代碼.32. GUI入門的好教材, 可以配套ARM使用, 內含有一些地層的初級函數和硬件接口..33. 基于ATmega16的BC7281鍵盤顯示源碼,拿過來就 可以用.34. 基于ATMEGA16的時鐘芯片原代碼.35. 基于ATMEGA16的溫度傳感器原代碼.36. 基于ATmega16的12864液晶顯示源代碼.37. 基于ATMEGA16的NRF905無線通信的C程序源代碼.38. 基于ATMEGA16的AD轉換的C程序源代碼.39. 基于ATMEGA16的DA轉換的C程序源代碼.40. 基于ＡＴＭＥＧＡ１６的步進電機的驅動程序.
上傳時間： 2013-06-18
上傳用戶：eeworm
