2010 The Investment: Bluetooth market discipline into the Aspect – Bluetooth, Automotive Electronics – Automotive Products Industry
Through a Bluetooth-enabled mobile phones, Bluetooth system can Car Automatic fault diagnosis, Electronic Navigation Variety of innovative applications. This article describes the application of design ideas, and a detailed analysis of Bluetooth system architecture and the Bluetooth hands-free application of norms.
Intelligent vehicle system forward, the direction of information technology and network development, automotive electronics market has become an important growth industry, wireless Communicate Technology in the automotive and other mobile systems have broad application prospects. This article describes the main application of car Bluetooth phone as a wireless gateway, automotive systems and mobile phone via Bluetooth wireless link connection, and then connected to the external wireless network. Using the program, a Bluetooth mobile phone users can easily use the following functions:
Hands-free phone: user access to the car, car mobile phone automatically connected to the user. The user is driving and hands-on can complete voice dial, answer, hang up and volume control functions, car microphone and sound system into the full-duplex speakerphone.
Car remote control: Users can use mobile phones within 10 meters control the car door and all kinds of switches.
Music Download: Users can download music to mobile phones Car Audio Play.
Electronic navigation: the user can download via mobile phones and other electronic map data to car GPS Navigation system, navigation system and then get the current coordinate parameter returned via SMS navigation center.
Automatic Fault Diagnosis System: Car system failure code by phone and other information sent to the repair center, repair center to send anyone to repair fault code and other information can be ready for the corresponding parts and repair tools.
Bluetooth in-car systems need to address the full application of the hardware and software problems. Hardware implementation of the Bluetooth RF and baseband parts of the operating temperature range, reliability and price are to be considered in the design of the hardware key issues, all the top car system function by the software. Bluetooth car hands-free phone system as the main application, the application specification has matured and received the support of many mobile phone manufacturers.
RF chip in 2.4GHz frequency band to provide wireless two-way data and voice transmission. Baseband chip includes frequency hopping, channel encryption and decryption, authentication, SCO voice codecs and other hardware, as well as link management, HCI interface firmware. Processor runs the Bluetooth upper protocol stack, application of norms and core software such as voice algorithms. To facilitate the description, this will be the RF, baseband and processor as part of the Bluetooth subsystem. Car stereo microphone and speakers through the car for the Bluetooth subsystem to provide sound input and output. Host controller to run man-machine interface (MMI) and other software, Bluetooth subsystem, car stereos and other car electronics centralized control and management, and information displayed in the graphical user interface (GUI) on.
First, the structure of the Bluetooth subsystem
Bluetooth Car Bluetooth subsystem implementation that contains the hardware and software application specification. Baseband chip interface through the UART and SSI processor: HCI commands, data and events through the UART interface transfer; SCO through the SSI interface to transfer data. As mentioned earlier, the processor running the Bluetooth upper protocol stack, application of norms and the core software audio algorithms. Figure 2 shows the Bluetooth subsystem in the processor running the software structure.
Circuit support package (BSP) contains all the hardware-related code, you can guarantee a good top software hardware independence. RTOS for software to provide a good structure and real-time performance. RTOS design should take full account of the RAM, ROM occupancy size, and task switching interrupt response time and scheduling algorithm meets the voice part of the real-time requirements. Bluetooth protocol stack including HCIHOST, L2CAP, SDP and RFCOMM and other upper layer protocol. In the protocol stack on top, according to different application requirements place a number of standard applications, such as hands-free application of norms and the application of standard headphones. As the new emerging application specification, software architecture by adding new applications to be easily standardized for future expansion of applications. Database records to add, delete and search capabilities to manage local and remote Bluetooth device's data, typically the data stored in Flash memory. The data storage device with the local Bluetooth address, device name, passkey and SDP records, and the remote Bluetooth device address, device name, SDP records, link key, authentication and authorization scheme. Because the system matches the needs and multiple remote devices, the database should be enough capacity to store data from multiple remote devices.
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