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嵌入式作業系統實作 Implementation of Embedded Operating Systems

嵌入式作業系統實作 Implementation of Embedded Operating Systems. 薛智文 cwhsueh@csie.ntu.edu.tw http://rswiki.csie.org/dokuwiki/courses:101_1:ieos http://www.facebook.com/groups/190254204331656/. Rules in Class. Be on time for class, deliverable, … No food but water. No nap but rest.

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嵌入式作業系統實作 Implementation of Embedded Operating Systems

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  1. 嵌入式作業系統實作Implementation of Embedded Operating Systems 薛智文 cwhsueh@csie.ntu.edu.tw http://rswiki.csie.org/dokuwiki/courses:101_1:ieos http://www.facebook.com/groups/190254204331656/

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  3. Rules in Class • Be on time for class, deliverable, … • No food but water. • No nap but rest. • Ask questions in>between>after classes. • Do participate. /28

  4. Outline • Introduction to Embedded System • Introduction to Embedded OS • uC/OS-II • Xen • OpenStack • uC/OS-III /28

  5. Introduction to Embedded System /28

  6. Preface • Window 2000, 30M lines. • Netscape Communicator 5, 17M lines. • A 圍棋 program, 0.01M lines. • A SOHO router, 0.6M lines. • What is Embedded (Linux/system)? /28

  7. Tinix’-“自己動手寫作業系統,” 于淵 org 07c00h ; tell the assembler to load onto 7c00, 0100h for DOS mov ax, cs mov ds, ax mov es, ax call DispStr ; call string display procedure jmp $ ; infinite loop DispStr: mov ax, BootMessage mov bp, ax ; ES:BP = string address mov cx, 16 ; CX = string length mov ax, 01301h ; AH = 13, AL = 01h mov bx, 000ch ; page number is 0 (BH = 0) black background red character ; (BL = 0Ch,highlight) mov dl, 0 int 10h ; the 10h software interrupt ret BootMessage: db "Hello, OS world!" times 510-($-$$) db 0 ; fill the rest of sector (512 bytes) with 0 dw 0xaa55 ; end of sector /28

  8. 電子書包與數位學習輔具分工架構圖 數位學習平台 數位學習輔具 開發工具 電子書包平台結構 數位學習輔具 數位學習平台閱讀 程式SCORM HTML XML 電子書包數位內容 開發工具 電子書包教學數位內容 • Physical • Serial • USB • 1394 • IrDA • Bluetooth • 802.11 教學 / 同儕群體 應用軟體開發工具 教師教學應用軟體 同儕群體應用軟體 電子書包教學應用平台 系統軟體開發工具 (SDK) 相容性測試軟體工具(TCK) 電子書包作業系統 (OS / UI / CM) • Protocol • SyncML 電子書包發展硬體 ICE DDK /28

  9. Example Ethernet RS485 Ethernet RS485 /28

  10. 在嵌入式軟體開發中採用的作業環境 EE Times-Asia, 2006 Dec /28

  11. 在設計專案中採用即時作業系統 EE Times-Asia, 2006 Dec /28

  12. 在韌體開發中採用的語言EE Times-Asia, 2006 Dec /28

  13. 在嵌入式應用開發中採用的語言EE Times-Asia, 2006 Dec /28

  14. 不同工具的重要性及工程師滿意程度 /28

  15. 嵌入式設計中前10名軟硬體開發工具 /28

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  17. Embedded System from Wikipedia • An embedded system is a computer system designed for specific control functions within a larger system, often with real-time computing constraints.[1][2] /28

  18. Where to Embedded? • IP (Intellectual Property) • SOC (System on Chip) • small size, low power • Chip • MCU (Micro Controller Unit), 70% market • DSP (Digital Signal Processor) • Module • General CPU • ARM7TDMI • Thumb, Debugger, Multiplier, ICE • w/o MMU • Pipeline, Cache, Bus, … /28

  19. What is an Embedded System? • A system designed to perform a specific function, e.g. eBook, PDA, eWatch, … • A combination of computer hardware and software, and perhaps additional mechanical or other parts. • Embedded vs. General-Purpose • What is a specific function? • Is there a limitation? • Cost, Robust, Low-power, Small, … • Using C + Assembly, Java ? /28

  20. Real-Time Systems vs. Embedded Systems RTS ES RTES .ABS .Radar .Calculator /28

  21. Real-Time Systems Value Deadline Soft RTS Hard RTS FirmRTS Time -Value /28

  22. Real-Time Systems (RTS) Open Distributed Soft RTS Hard RTS Proprietary Centralized Firm RTS Embedded /28

  23. Application vs. Response Time /28

  24. Embedded System Examples • Computer peripherals • Keyboard, Mouse, … • Information Appliances • Set-Up Boxes, WebTV, … • Monitors and Sensors • Fire Alarm, Heartbeat Detector, … • Controllers in Electronics • Refrigerator, Air Conditioner, … • Communication Devices • Hub, Router, … • … /28

  25. Business Issues of ES • Time-to-market for new devices • Design to delivery: in weeks • Sustained pressure to reduce costs • Many proprietary choices yield low-margins • Life cycle management • New products overlapping each other • Positioning nightmares • Open platform choices considered risky? • Resources expended on “recreating the wheel…” not on product differentiation. /28

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  29. ES Technology Issues • Need more complex technology integrated for new services • broadband, wireless, real-time, low-power, IOT… • Multiple emerging standards need to be deployed simultaneously. • Product released globally on the same day! • Tools, Tools, Tools, … • Third party software • No one company can do it all anymore • Support nightmares • Lack of sources from proprietary choices • Open sources sound seductive … but risky. /28

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