Driver development and application topics
BACKGROUND: Many Wireless Internet Cards in the market, wireless modem, including GPRS wireless Internet card, CDMA wireless Internet card, EDEG wireless network card, is implemented through communication networks. The coverage and signal strength of the communication network is and The network operator's equipment is closely related. For example, China Mobile, China Unicom, China Wei News, China Tietong, China Telecom. CDMA, GSM, PHS, PCS, etc. Network, all support wireless mobile terminals can realize call, SMS, Internet, etc. The necessary infrastructure. The wireless Internet is an important part of the data business launched by operators. Generally speaking, it is to add special channel boards or control network management, servers, and the like in the device. In order to make mobile terminals can easily use Among them, there are several types of networks, which is usually 2G, 2.5G, 3G, 4G, etc., which are involved in the bandwidth and transmission performance of the network. In accordance with the development direction, the network will Gradually provide greater bandwidth to meet the needs of wireless communications in people's lives. For countries where the world is using the network, mature is also the United States, Canada, Japan, South Korea, Singapore, Hong Kong, Europe and other regions and countries. Just For network equipment providers, there are Bell, North Electric, Alcatel, Siemens, Motorola, Ericsson, ZTE, Huawei, etc. For the frequency band, it is more. And each country is not a general standard. So specifically Each country regulations and the agreement of the telecom alliance. Development: For wireless Internet cards, there are many kinds, but they do not leave it. For GPRS wireless Internet cards and RF modules, it is relatively mature. Therefore, Global application is also the most wide. For CDMA wireless network cards, only countries covered in CDMA networks can be used. And the CDMA wireless terminal, or the CDMA module, or the CDMA chipset, you can't say Qualcomm. Gao Tong In the United States, it has received many patents in the CDMA field. Therefore, all countries and equipment using CDMA have to pay high-quality patents to Qualcomm. Of course, now, many domestic and foreign manufacturers are also develop and develop. Chip or chipset. But from a general speech, there is still a big gap. Design: From the design of the specific mobile terminal, if you use the chipset, or module, industrial module, etc., no matter which country, Regardless of which vendors. Eventually to use the MSM chip. From the historical development of MSM, it has been upgraded. Among them, there are MSM3XX, MSM5XXX, MSM6XXX, etc. App: After designing the chip, There will be a suit, or a chipset, or a module. Engineers use these technology to manufacture applications. For example, PCMCIA, USB, CF, RS232, and the like are used to easily connect and communicate with the computer. Then involve specific Conversion Chip, interface chip. Then there is a driver development of a special chip. For example, adapt to the driver of Windows, Linux, OS / 2, Mac and other operating systems. Then write a specific installer. Because the user is installed Trouble. Since it is limited by the operating system. Therefore, it is necessary to prepare a specific program or software to install the chip driver. Software is written. Connect the computer, the interface can be made into a variety of features. So each company It has been produced or developed, so there is a lot of markets. Actually the application, called a lot, for example, dialing software, dialing, free, online, No. 1, one point, one point, casual line , Arbitrary, with E line, serving the E line, dial-up connection, dial-up, automatic dialing, automatic connection, creation, creating a dialer, CDMA professional dialing software, GPRS professional dialing software, etc. In the underlying layer, there is Several levels: 1: Chip driver 2: Chip drive installation file 3: Serial port (port) device mapping installer (COM, port, etc.) 4: Modem device mapping installer (MODEM, etc.) 5: Dial-up connection Program (automatically created a dial-up program) 6: Applications (such as IE, Netscape, self-contained client applications, client interface, interface program, interface software, ui, gui, etc.) then according to these steps, then Using programming technology and knowledge, you can write a variety of applications. Www.caylay.com / BBS
