Several important factors of embedded operating system of ARM CPU

The second is the processor. It can be suitable for 90~95% of various embedded system applications. Of course, if you want faster real-time response, such as high-speed A/D conversion requires an interrupt delay of less than a few microseconds, uC/OS-II may be suitable. Of course, you can also use traditional embedded operating systems such as Vxworks to meet such strong real-time requirements. ARM

The third is development tools. Obviously, there is still some gap between the development tools of uC/OS-II, uCLinux and embedded Linux and commercial embedded operating system tools. At present, the ARM company's SDT/ADS tool chain is widely popular and used on ARM CPU. The product is very good in terms of function, stability and support from many third-party manufacturers. The only shortcoming is the lack of support for embedded Linux operating system. The upgraded product RealView of SDT/ADS plans to support GCC and embedded Linux, but it has not been seen yet. uC/OS-II can use ARM SDT/ADS, but there is no operating system debugging function.

The fourth is the selected ARM CPU and reference board. Cores like ARM7TDMI and ARM940T (such as S3C2500/2510) cannot use embedded Linux. If you want to use Linux, you can only use uCLinux. If you want to use VxWorks, you need to find out whether the company that provides the evaluation board has a BSP (board support package). VxWorks itself is only supported by a few ARM evaluation boards.

Finally, there are price and technical services. When considering purchasing a commercial embedded operating system, it is normal to encounter the question of whether to buy or make it yourself, especially when using open source technology, this problem is more prominent. One thing to note is that some products such as VxWorks charge development fees based on the number of users, and also charge royalties for each VxWorks software run based on the actual number of user products sold. uC/OS-II only charges a one-time royalty for each product (unlimited quantity). Linux, whether uCLinux or embedded Linux (even commercial versions like MontaVista Linux), does not charge royalties. Commercial embedded Linux charges development fees in the form of service fees or subscriptions. Obviously, foreign products are more expensive, but we have to admit that they are far ahead in embedded operating system technology.