资源描述：
《the software platform for digital video外语英文电子书》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、TheSoftwarePlatformForDigitalVideoYongdaeChoContentsßEmbeddedSystemßEmbeddedOperatingSystem°messagepassingwithinasingleCPUßRealTimeOperatingSystem(RTOS)°VxWorks,pSOSystem,Nucleus,OS-9등ßEmbeddedOSOverview°Linux,WinCEßApplicationExample°FocusonDTVsolution1EmbeddedSystem정보가전시장동향ß정
2、보가전시장은주로신개념의가전을지칭°셋탑박스,스크린폰,PDA,핸드핼드PCß일종의개인용컴퓨터로서인터넷접속혹은데스크탑PC와연계성을보장하면서기존제품(TV,휴대폰,전화기)의기능을동시에제공ß대부분이VxWorks나WinCE를토대로개발ß공개운영체제인Linux를토대로정보가전기기에활용하려는개발이진행중(ETRI중심)EmbeddedSystem반도체시장동향ß반도체성능향상의문제점°고집적화및미세화에의한소비전력증가°신호처리의지연°설계비용증가ß“무어의법칙”이깨질것이라는위기감고조ß마이크로프로세서에각기능적인요소를삽입하는임베디드화
3、된작업이진행중2EmbeddedSystem소프트웨어시장동향ßIn-House임베디드소프트웨어°판매목적이아니라특수한목적에제한적,혹은회사내부사용목적으로제작ß상용임베디드소프트웨어°대부분RTOSVendor들이자신들의RTOS에맞는Tools을함께지원하는형태로진행OperatingSystem목적/관리대상ß운영체제의목적°신뢰도의향상°처리량의향상°하드웨어특성의추상화°효율적인자원관리ß운영체제의관리대상°중앙처리장치(CPU)°기억장치(Memory)°입출력장치(I/ODevices)°파일관리3EmbeddedOS란무엇인가?ß
4、일반적으로임베디드시스템(EmbeddedSystem)에서동작하는운영체제를내장형운영체제(EmbeddedOS)라고한다.ß범용운영체제와내장형운영체제의구별이정해진것이아니다.일반적인EmbededSystem의SoftwareStructureApplicationMediaPlayerMiddlewareRTOSRTSchedulerProtocolEmbeddedSystemStack(DTV)NetworkadapterMediaStreamNetwork4EmbeddedOS의종류ßRTOS°VxWorks,pSOS,VRTX,QNX
5、°Nucleus,OS-9,EPOCßWindowsCEßEmbeddedLinux/Real-TimeLinuxßEmbeddedJava/PersonalJavaRealTimeSystemß의미°규정된시간에주어진작업이처리되는것°HardRealTime/SoftRealTimeß배경°보다정교한작업을수행°원하는결과를도출°프로세서(CPU)의기능과속도가고속화및대용량화°다중처리°프로세서(CPU)의성능을최대한이용ß실시간시스템의적용예°핵발전소제어,우주항해와유도시스템,탐사시스템°로봇공학,자동차엔진제어°DTV,Mobilepho
6、ne,Printer,Digitalcameraetc.5RealTimeOperatingSystem(RTOS)ß기존의운영체제에실시간의개념이추가ßEmbeddedOS로성장ßEmbeddedSystem내에이식되어동작ßSmallfootprintßFastresponseforreliabilityßLowcostforvolumemanufacturingRTOS의특징ß응용분야의다양성°가전제품,통신장비,로봇,무기시스템,무인자동차ß실시간의제약°입력주기,실행마감시간,메시지전송시간,정확한정보수집ß높은신뢰성을요구6RTOS의필요
7、조건ß하드웨어특성의추상화ß멀티태스킹(Multi-Tasking)ß예측가능한문맥전환(가장중요한부분)ßRealtime은deterministic한응답을의미함.하드웨어특성의추상화ß모든운영체제시스템의기본적인기능ß내장형시스템의소프트웨어의편리한개발,유지,보수#include프로그래머는모든것을코voidmain()딩해야함.{printf("Hello,World₩n");VideoCard}InitializationMemoryOperatingSystemManagementVideoCardOperationRTO
8、S를사용하는경우RTOS를사용하는않는경우7Multi-Taskingß정의°태스크는응용프로그램의실행가능
