Since NOKIA 7650, 3650 has been launched, people have been surprised that these two mobile phones provide the powerful features provided by users. This function has far more than the impression of the mobile phone to people. In fact, this is entirely dependent on the operating system used by these two mobile phones - Symbian operating system, which is the existence of this system to make a wide range of extensions in mobile phones. In fact, for the mainland's mobile phone market, before 7650, 3650, NOKIA's 9210c, Ericsson's R380 has begun to adopt the Symbian operating system, and recently launched the more powerful Sony Ericsson P802 also uses this operation. System, at the same time, other mobile phone brands are also preparing to launch high-end phones that use the same operating system. With the increasing mobile phones that use the Symbian operating system on the market, many friends have a strong interest in Symbian. The following is about Symbian's common sense introduction: 1. Symbian's origin and industry status: Symbian is a Nokia, Motorola, Silver, Mitsubishi and PSION jointly investing joint ventures. The purpose of this company is to design a powerful support capabilities and open operating system, which can be applied to mobile phones and similar mobile communication terminal products, and promote high-end intelligent mobile phones through this system. Similar end products enter the field of public consumption as soon as possible. The SYMBIAN operating system is to achieve the above purpose, and the product has been developed by this joint venture, the operating system optimizes the mobile communication terminal product (such as mobile phones). Since June 1998, Symbian has been established, there are Siemens, Samsung, Panasonic, Sony Ericsson and other mobile phone manufacturers to join the company, participate in the system's technology development, and the Symbian operating system has been licensed as Nokia, Motorola, Samsung, Siemens, Sanyo, Panasonic, Sony Ericsson, Fujitsu, Sendo and PSION, these manufacturers occupy more than 80% of the global mobile phone market. Second, the Symbian operating system Advantages: Symbian operating system is a 32-bit prodite multitasking operating system with high performance, which uses advanced design ideas, excellent connectivity and powerful scalability, and effective Reduce power consumption. This operating system is very suitable for small size, strong, and facing the public communication terminal equipment (such as mobile phones). The Symbian operating system is written in C language, which is a full-scale object operating system. This makes it a strong flexibility, effectiveness, and has the ability to reuse the code. Since the Symbian operating system uses a C type application interface (Application Program Interface, API), it can manage the simultaneous tasks and device memory, which can be effectively managed, minimize reduction of central processors and consumption Memory operation, such as a context switch program operation in the operating system. In fact, since the Symbian operating system is mainly an event drive type, not a multi-threaded type. This event-driven Symbian operating system does not require any of the context exchange programs of any operating system itself. In this case, each thread can save additional consumption of thousands of bytes, and replaced it only requires less than dozens of An additional consumption of bytes. In addition, since the Symbian operating system uses a clear defined application interface, various application software development organizations can easily develop, design-related applications, and this program can be easily downloaded, Installing different types, different brands, different models of different types, different brands, and different models compatible with the Symbian operating system.
Third, the development advantage of the SYMBIAN operating system is due to many mobile communication terminal equipment manufacturers that support the Symbian operating system, so there is a relatively large number of end products that support the different brands and models of the system, so that this operating system can be quickly Pushing to the market, and then be received and recognized by consumers, while consumers have more product options. At the same time, since this system provides an open and standard development platform for third-party application developers, these developers can be easily developed, design and related applications on the one hand, and there are more You can use, running terminal products, which is beneficial to developers' market extensions. Fourth, the development disadvantages of the Symbian operating system Although there are many mobile communication terminal equipment manufacturers of the Symbian operating system, the operating systems of various products have been independently developed independently, so they are often incompatible, and gaps in design ideas. It will often be very big. In this way, when you work together to develop a shared Symbian operating system, the required side focus often vary, sometimes there will be more contradictory contradictions, which will affect the planning and development speed and applicability of the operating system. In addition, since the mobile communication terminal equipment manufacturers are not professional application development companies, they are facing many difficulties in the development of application software, especially in office software, media recording software, etc., which is likely to cause Symbian operations. There is not enough application software that can be used, which is not conducive to the powerful support of the Symbian operating system. V. Symbian operating system reliability guarantees to ensure that user data is not easily lost, and ensure that the device running the system does not require frequent restarts, the Symbian operating system provides developers with some necessary tools to achieve this, including : 1. Use effective memory management to prevent memory leakage; 2. Once resources are no longer needed, release them immediately; 3. Out of the correct error handling mechanism correctly handle insufficient errors in memory. Six, the function of the Symbian operating system The function of the Symbian operating system depends on the type of device to be used, that is, there is no unified, consistent Symbian operating system. For different device types, different Symbian operating systems developed according to their requirements. Each particular operating system is called device type reference design (Device Family Reference Design), and English is referred to as DFRD. Seven, DFRD classification DFRD is developed according to different types of mobile communication devices, different Symbian operating systems, different DFRDs define different functions, including user interface and hardware configuration. Depending on the characteristics of the device using the Symbian operating system, DFRD currently has three types of Crystal DFRD, Pearl DFRD and Quartz DFRD. 8. Crystal DFRD Crystal (Crystal) DFRD is a Symbian operating system designed for powerful mobile communication terminal type devices. The biggest feature of such devices is to have a full keyboard (ie typical standard computer keyboard layout) and a large lateral display. Such devices are designed for business users who need to perform a lot of information, so the application design in business processing is particularly prominent. Nokia's 9210 and 9290 are products belonging to this series. Nine, Pearl DFRD Pearl (Pearl) DFRD is a Symbian operating system for smart mobile phone development. Such equipment is very similar to the standard mobile phone in appearance: the screen is relatively small, using the digital buttons, a small number of function buttons, the keyboard design, which is relatively simple. Nokia's 3650 and 7650 is a typical representative of this Pearl DFRD product line.
10. Quartz DFRD Quartz DFRD is a Symbian operating system for mobile terminal equipment similar to the handheld, can be developed by electronic pen. This type of equipment is characterized by a larger longitudinal display, which is mainly written, and the keyboard operation is secondary. Such devices are more popular relative to crystal devices, suitable for processing of personal digital information. Sony Ericsson's P802 should belong to this series of articles: http://symbian.org.cn/bbs/viewtopic.php? T = 1040
