In fact, embedded systems are not a new thing, from the 1980s, there are some IT organizations, companies, and research and development of commercial embedded systems and special operating systems. This has emerged some famous embedded systems:
Windows CE
Microsoft Windows CE is a multi-thread, complete priority, multitasking operating system designed for a limited resource platform. Its modular design allows it to customize it for user electronic devices from the handheld to a dedicated industrial controller. The basic kernel of the operating system requires at least 200K ROM.
VxWorksvxWorks is the most widely used system in the field of embedded systems. It supports multiple processors, such as X86, I960, Sun SPARC, MOTOROLA MC68XXX, MIPS RX000, POWER PC, and more. Most VxWorks APIs are proprietary. The compilation and debugger of the GNU. Psosisi has been merged by WinRiver, and PSOS is now the product of Windriver.飧 飧 低 低 瞿 瞿 瞿? ⒏ 咝 艿 艿 辈 童 童 常 常 峁 峁 常 常 常 常 常 常 常 常 常 常 常 常 常 常 常 常 常 常 常 Salty └ └ 咝 呖 呖 呖 呖 呖? The tip of each ⒄ 吒 莶 飨 飨 车 δ 蠖ㄖ 蠖ㄖ 蠖ㄖ 蠖ㄖ 蠖ㄖ 诖 诖 嫘 枨 蠖ㄖ 蠖ㄖ 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南 南⒄ 呖 岳 岳 迪 执 执 虻 虻 ジ ジ ⑼ ⑸ 啻 啻 场 缁 啻 啻 啻 啻 啻 啻 系统 系统 系统 系统It partially follows the POSIX-related standards, such as: POSIX.1B real-time extension. It provides a small micronard and some optional mating processes. Its core provides four services: process scheduling, inter-process communication, underlying network communication and interrupt processing, its process runs in standalone address space. All other OS services are implemented as collaborative user processes, so the QNX kernel is very small (qnx4.x is approximately 12KB) and runs extremely running. This flexible structure can use the household to configure the system into a slight embedded operating system or a super virtual machine operating system including hundreds of processors, depending on the actual needs. Palm OS3Com's Palm OS has a large market share in the PDA market, which has an open operating system application interface (API), developers can develop the required applications as needed. OS-9MICROWAVE OS-9 is an operating system designed for key real-time tasks for microprocessors, which is widely used in high-tech products, including consumer electronics, industrial automation, wireless communication products, medical instruments, digital TV / multimedia equipment. . It provides good security and fault tolerance. Compared to other embedded systems, its flexibility and upgradeability are very prominent. LynxosLynx Real-Time Systems Lynxos is a distributed, embedded, scalable real-time operating system that follows POSIX.1A, POSIX.1B, and POSIX.1C standards. Lynxos supports thread concepts, providing 256 global user thread priorities; providing some traditional, non-real-time service characteristics; including virtual memory based on calling requirements, a MOTIF-based user graphical interface, a network system compatible with industrial standards and Application development tools.
Figure 1 1998 - Introducing trend of embedded operating systems
Figure 2 Embedded operating system used in the next 24 months
