The principle and application of WiFi without operating system
At present, in wireless monitoring, industrial control, video transmission and other industry applications, embedded wireless systems mainly use a no operating system environment represented by the NORDIC solution, which consists of "CPU + wireless data transmission module" and can achieve short distances. Low-bandwidth wireless communication. However, due to the technical limitations of narrowband wireless communication, it can only achieve a maximum transmission rate of 2 Mbps, corresponding to the actual video transmission, which can only meet the application of less than 15 frames per second at 320 * 240 within 10 meters. With the market demand for larger screens, faster transmission rates, and smoother video effects, this solution will be far from meeting people's needs. System upgrade requires broadband wireless transmission equipment such as WLAN. The traditional upgrade method is to add Flash and SDRam under the original system architecture and run an embedded operating system to drive the WLAN module, which not only greatly increases the system cost, but also product development The difficulty increases and the cycle lengthens, which is not conducive to the introduction of new products.
As the most widely used technology in wireless local area network communication, WLAN has gradually extended from the PC / notebook market to audio and video, handheld terminals, wireless city coverage, industrial applications and other aspects of people's daily lives, bringing people's lives into a convenient The era of intelligent wireless.
The Nos-WiFi product (shown in Figure 1) launched by Beijing CLP Huada Electronic Design Co., Ltd. has changed this situation. Huada Electronics has devoted itself to the research and development of WiFi core chips and module products for many years. So far, it has successfully mass-produced three chips of the Airquick series (Airquick) that also support the domestic (WAPI) / international (11i) security standards, and Based on this, nearly ten WLAN module products have been launched. The product applications cover various fields such as notebooks, USB external wireless network cards, home audio and video, security monitoring, operator hotspot products, home gateways, industrial applications, and intelligent transportation.
Nos-WiFi series module products are developed to meet the needs of wireless function upgrades of existing products in industrial applications, security monitoring and other fields. Its biggest feature is that it provides a driver software that is not based on any operating system. Can be integrated into any system platform to run, and achieve high-speed data transmission, making it possible to use WiFi for video transmission without an operating system. Its driver software structure is shown in Figure 2:
The location of this product integrated into the host system is shown in Figure 3:
Nos-WiFi features and status
For most USB wireless modules based on the 802.11b / g / n standard on the market, most of them are used on the PC platform. Therefore, manufacturers of these usb wireless modules usually only provide Windows or Linux-based environments. Drivers, corresponding to embedded applications, only use embedded system platforms such as WinCE, embedded linux operating system to apply these products. For embedded devices with limited hardware resources and low processing power, WinCE and embedded linux are undoubtedly a behemoth. They only use some simple operating systems that support scheduling functions or even do not use any operating systems. The only choice. There is no USB wireless module available on these systems. Even if these manufacturers are forced to upgrade the hardware of the system to meet the needs of using USB wireless modules, the resulting increased cost greatly reduces the competitiveness of the products. For example, in a typical Linux operating system-based embedded device that supports WiFi functionality, in order to support the operating system, the hardware architecture requirement is "CPU + 32MB SDRAM + 32MB FLASH", while in an embedded device that does not run the operating system Inside, the hardware architecture can be changed to "CPU + 8MB SDRAM + 1MB Serial flash", and the resulting cost difference is about $ 4. Considering the difference in the price of the main CPU, the overall cost of the device in the operating system environment is about 6 different US dollars.
At present, the wireless data transparent transmission business field without operating system environment mainly uses 2.4Ghz private protocol wireless data transmission modules (non-standard WiFi products) of companies such as Zigbee or Nordic, but these products can only be realized within a short distance (about 10m) With a data throughput rate of about 2Mbps, it is impossible to achieve indoor and long-distance data transmission with large amounts of data. The wireless transmission scheme using Nos-Wifi products, based on the WiFi transmission technology of the 802.11g standard, the maximum transmission rate of the physical layer can reach 54Mbps, even if the outdoor coverage is 100 meters, the physical layer transmission rate of 5.5Mbps can still be achieved, making Long-distance, high-throughput data transmission becomes possible.
Typical applications of Nos-Wifi products
Streaming TV
In the general environment where modern life is advancing toward digitalization and networking, the 3c integration of home appliances has become an inevitable product development trend, and the status of TV as the display center of modern homes is unshakable. Therefore, streaming media TV came into being. Streaming TV can not only watch clearer TV programs, but also play pictures, music, movies in digital devices such as digital cameras and mobile hard drives for the whole family to enjoy together.
The combination of streaming TV and WiFi technology allows people to directly connect to the home computer through the wireless network, so as to directly play the streaming media files stored on the computer, and even further, use the wireless network to access the Internet network through the home wireless router. Realize the real network online playback function. Nos-Wifi products make it easier to add WiFi functionality to streaming TV.
Wireless security, video surveillance
In peer-to-peer wireless communication applications, such as baby monitor and other monitoring products, Nos WiFi can better show its advantages.
Baby Monitor, that is baby monitor, is a small radio transmission device, including transmitter and receiver. The transmitter is placed next to the baby, equipped with a microphone and a camera, and every subtle sound and action from the baby can be accurately recorded, and a clear signal is sent through the antenna on the transmitter. The receiver is a portable handheld display that receives these signals and is carried by parents. With this device, parents can handle other affairs in other rooms and even in outdoor courtyards, and at the same time, they are well aware of the child's situation.
Industrial control, intelligent transportation
Modern industrial control has higher and higher requirements on the networking capability of the system, and the complexity of industrial control is getting higher and higher. Therefore, the resource limitation of the CPU in industrial control is also increasing. This module product can easily upgrade the existing system without changing the system's large structure. Upgrade the existing system to a wireless TCP / IP network.
Similarly, the modern functional transportation field requires higher and higher system networking capabilities and system networking flexibility. Nos-wifi can easily upgrade the original system. The transportation facilities can be easily connected to the TCP / IP network.
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