嵌入式LINUX-复习整理_2019.doc

chp1 Overview of embedded systems Definition of embedded system: The Special purpose computer system which are centered in application, based on computer technology, and their software and hardware can be cut out , they can meet the strict requirements of the application system for function, reliability, cost, volume, and power. Characteristics of embedded system: For specific applications, there are generally real-time requirements. It’s a constantly innovating knowledge integration system which integrates advanced computer technology, semiconductor technology, electronic technology and communication network technology. Embedded system is organically integrated with the specific application object, so its upgrade and replacement is also synchronized with the specific products. The software and hardware design of embedded system focuses on high efficiency. For meeting the application requirements to the maximum extent, reducing the cost is a major problem that must be considered. Embedded system software is generally solidified in memory chips, rather than stored in disks and other carriers. 3. The composition of embedded system: Embedded system is usually composed of embedded processor, embedded peripherals, embedded operating system and embedded application software. What are the types of embedded processors? EMPU (embedded microprocessor unit) EMCU (embedded microcontroller unit) EDSP (embedded digital signal processor) ESOC (embedded system on chip) What are the functions of embedded peripherals? Auxiliary functions(辅助功能) such as storage, communication, protection, debugging, display, etc. What kinds of embedded peripherals can be divided into? Memory: RAM, SRAM, DRAM, ROM, EPROM, EEPROM, FLASH, etc. I/O interface: RS-232, IRDA(红外线数据输入输出), I2C(现场总线), SPI(串行外设接口) , USB, Ethernet, EPP, etc. Input and Output Equipments: Keyboard, LCD, LED, CRT, Touch screen, etc. 7. List some kinds of embedded operating system: Windows CE, Embedded Linux, Palm OS, pSOS, Delta