CN1175696C - A device and method for adding bluetooth function on cellular phone and Smart Phone platform - Google Patents

Abstract

The invention discloses a method for adding bluetooth function on the existing cellular phone and Smart Phone platform. The said equipment includes: man-machine interface unit, GSM/GPRS module, bluetooth module, antenna, codec and other peripheral equipment , the method is characterized in that: the hardware structure of existing cell phone and Smart Phone does not change greatly, only need to increase bluetooth module and CODEC circuit; Integrated bluetooth protocol stack and multiple bluetooth application frameworks in the bluetooth baseband processor (Profiles); the physical interface between the main processor of the cellular phone and the Smart Phone and the Bluetooth baseband processor adopts the universal asynchronous transceiver (UART) format; the information exchange between the main processor of the cellular phone and the Smart Phone and the Bluetooth baseband processor Instead of using the Bluetooth standard host control interface (HCI) protocol, a self-defined simple message is used. The advantage of this method is that because most of the Bluetooth-related functions are implemented in the Bluetooth baseband processor, electronic engineers can use it without familiarity with Bluetooth. In the case of technology, by adopting the Bluetooth baseband processor, the application meeting the Bluetooth specification can be quickly realized on the existing cellular phone and Smart Phone platform.

Description

A kind of equipment and method for adding bluetooth function on cellular phone and Smart Phone platform

technical field

The invention relates to bluetooth technology in the field of wireless communication, in particular to a method for increasing bluetooth communication functions.

Background technique

Bluetooth technology is an open global specification for wireless data and voice communication. It aims to establish a wireless connection with low power consumption, low cost, short distance and miniaturization. radio technology. Bluetooth technology has broad prospects for development in the fields of industry, agriculture, and public utilities, especially in the field of consumer electronics. Cell phones and Smart Phones increasingly include Bluetooth as a must-have.

Existing Bluetooth cellular phones and Smart Phones mostly use an external Bluetooth baseband processor. The interface between the processor and the main processor is a transport layer interface in the format of Universal Asynchronous Receiver and Receiver (UART), and the host control interface defined by the Bluetooth specification is adopted. (HCI) protocol for information exchange. The feature of this solution is that the main processor is responsible for executing the Bluetooth protocol stack and application framework (Profile), and the Bluetooth baseband processor completes the lower-layer functions defined by Bluetooth specifications such as Bluetooth baseband processing and radio frequency transceiver.

To add the Bluetooth function to the cellular phone and Smart Phone using the above method, it is necessary to implement the Bluetooth protocol stack and Profile on the main processor. For ordinary technicians, it is quite difficult to fully grasp Bluetooth technology in a short period of time, so as to develop products with Bluetooth functions; The purpose of cooperating with existing GSM/GPRS or CDMA applications on the processor platform is also not easy. This phenomenon is widespread and affects the promotion of Bluetooth technology.

Contents of the invention

The purpose of the present invention is to overcome above-mentioned defective, provide a kind of equipment and the method that add bluetooth function on existing cell phone and Smart Phone platform. With this method, application engineers can quickly implement applications that meet Bluetooth specifications on existing cellular phones and Smart Phone platforms without being familiar with Bluetooth technology.

A kind of equipment and method for adding bluetooth function on existing cellular phone and Smart Phone platform of the present invention are realized by following technical scheme, and described equipment comprises:

A man-machine interface unit is used for man-machine interaction, and the man-machine interface unit is connected with the main processor;

The GSM/GPRS module is used to implement GSM/SPRS or CDMA baseband codec and voice coding. The GSM/GPRS module includes a main processor with built-in DSP, microcontroller, SRAM and flash memory unit; the radio frequency module completes the radio frequency The sending and receiving related functions; the power management module is used to manage the power of the device;

Bluetooth module, including a baseband processor and a wireless transceiver device, used to realize the control of the link manager, baseband controller, wireless transceiver and link management protocol function module;

The baseband processor integrates the Bluetooth protocol stack and various profiles at the same time, and is connected to the main processor through the UART interface. The baseband processor can implement Bluetooth service discovery protocol (SDP), serial port emulation protocol (RFCOMM), telephone control ), Logical Link Control and Adaptation Protocol (L2CAP) and control of HCI driver function modules, including Generic Access Application Framework (GAP), Human Device Application Framework (HID), Service Discovery Application Framework (SDAP), cordless phone applications Framework (CTP), Internal Phone Application Framework (ICP), Car Hands-Free Phone Application Framework (HFP), Headset Gateway Application Framework (HSP/AG), Serial Port Application Framework (SPP), Object Push Application Framework (OPP) Various application frameworks (Profile);

The antenna is used for receiving and sending wireless signals, and is connected with the Bluetooth wireless transceiver device;

Codec (CODEC), one end of which is connected to the Bluetooth module through a pulse code modulation (PCM) interface, converts the digital voice signal on the Bluetooth module side into an analog signal, and the other end is connected to the GSM/GPRS module through an analog signal interface, and the GSM The analog signal on the /GPRS module side is converted into a digital signal.

Other peripherals, including SIM card interface circuits, receivers and speakers, are used for functions required by traditional cellular phones and Smart Phones.

The man-machine interface unit is a button, a light emitting diode, a keyboard, a liquid crystal display or other available devices.

The methods described include:

(a) The hardware structure of the existing cellular phone and Smart Phone does not need to be greatly changed, only the Bluetooth module and the CODEC circuit need to be added;

(b) Integrating the Bluetooth protocol stack and multiple application frameworks in the Bluetooth baseband processor;

(c) A transport layer interface in UART format between the main processor and the Bluetooth baseband processor of the cellular phone and the Smart Phone;

(d) The information exchange between the main processor and the Bluetooth baseband controller of the cellular phone and Smart Phone does not use the HCI protocol of the Bluetooth standard, but uses a custom simple message.

By adopting the method of the present invention, developers only need to know how to use self-defined simple messages to carry out information interaction with the Bluetooth baseband processor, and can design bluetooth products that meet the specifications, without knowing the technical details of the bluetooth protocol stack and Profile, The design cost of the product is reduced, the reliability of the product is improved, and the product can enter the market quickly.

Objects and advantages of the invention will be facilitated by describing in detail preferred embodiments of the invention with the aid of the accompanying drawings. in:

Description of drawings

Fig. 1 is the hardware structural diagram of bluetooth baseband processor;

Fig. 2 is the functional block diagram of conventional Bluetooth baseband processor;

Fig. 3 is the functional block diagram of the bluetooth baseband processor that adopts according to the present invention;

Fig. 4 is the hardware structural diagram of the Bluetooth GSM/GPRS cellular phone realized according to the present invention;

Fig. 5 explains the manner of information exchange between the main processor and the Bluetooth baseband processor in the Bluetooth cellular phone realized according to the present invention.

Detailed ways

Fig. 1 is a hardware structural diagram of the Bluetooth baseband processor. As shown in FIG. 1 , the Bluetooth baseband processor 300 is composed of multiple hardware units. Among them, the microprocessor 360 is the core of the chip and is the execution platform of the control software. The program and data of the control software are stored in ROM390 and SRAM380 respectively. Various external interfaces of the Bluetooth baseband processor are managed by relevant hardware units respectively. The baseband control logic 370 completes the functions that can be realized by the logic circuit in the baseband control, and is connected with an external radio frequency chip. The radio frequency chip can also be built into the Bluetooth baseband processor. UART310 supports the transmission interface of UART format. USB320 supports the transmission interface of Universal Serial Bus (USB) format. UART310 and USB320 are usually used to communicate with external processors and transmit HCI commands and data conforming to the Bluetooth specification. GPIO330 is used to interact with external hardware. The audio CODEC340 adopts the pulse code modulation (PCM) format, which is the channel for the Bluetooth baseband processor to send and receive voice signals. The external memory interface is used for memory expansion, including data lines, address lines, chip select signals, etc.

Fig. 2 is a functional block diagram of a conventional Bluetooth baseband processor, based on the hardware shown in Fig. 1 (including a built-in radio frequency chip). Among them, the link manager 240 is responsible for receiving the commands and data sent by the upper layer module, and returning the result to the upper layer. The link manager 240 completes corresponding functions through the baseband controller 220 and the radio frequency module 210 . The link management protocol 230 is used for mutual communication between link managers of different Bluetooth devices. The baseband controller 220 operates according to commands of the link manager 240 . The radio frequency module 210 wirelessly transmits and receives information according to standard specifications. It can be seen that the Bluetooth baseband processor itself cannot constitute an independent product, it must be connected with an external processor, and the Bluetooth application program is executed on the external processor.

Fig. 3 is a functional block diagram of a Bluetooth baseband processor adopted according to the present invention. Based on the hardware shown in Figure 1. Among them, the functions of the radio frequency module 450, the baseband controller 460, the link manager 470, and the link management protocol 440 are consistent with those of the corresponding modules in FIG. 2 . SDP (Service Discovery Protocol) 440, TCS (Telephone Control Protocol) 480 and RFCOMM (Serial Port Emulation Protocol) 490 are various Bluetooth protocols. The standard communication protocol L2CAP (Logical Link Control and Adaptation Protocol) 430 multiplexes various protocols of the upper layer. Bluetooth application program 410 includes GAP (General Access Application Framework) 417, HID (Human Device Application Framework) 418, SDAP (Service Discovery Application Framework) 416, CTP (Cordless Telephony Application Framework) 415, ICP (Internal Telephony Application Framework) 414, HFP (car hands-free phone application framework) 413, HSP/AG (headphone gateway application framework) 412, SPP (serial port application framework) 411, OPP (object push application framework) 419, etc. In other possible implementations, the application program loaded into the Bluetooth baseband processor may be a subset of the Bluetooth application program 410 in this figure. The transport layer interface 419 is used to communicate with the main processor, interpret and process the commands and data sent by the main processor, and send the status and related data of the Bluetooth baseband processor to the main processor.

Fig. 4 is a hardware structural diagram of a Bluetooth GSM/GPRS cellular phone realized according to the present invention. Among them, the man-machine interface unit 510 is used for man-machine interaction and is connected with the main processor; the GSM/GPRS module 520 includes the main processor 521 , radio frequency 522 and power management 523 . The main processor 521 has built-in units such as DSP, microcontroller, SRAM and flash memory, and its main functions are GSM/SPRS baseband codec, voice coding, etc.; in addition, GSM/GPRS applications also use this as an execution platform. The radio frequency module 522 completes functions related to sending and receiving radio frequency. The power management 523 is responsible for the control of various power saving modes. The Bluetooth module 550 includes a baseband processor 551 and a wireless transceiver 552, capable of controlling the link manager, baseband controller, wireless transceiver and link management protocol functional modules. The baseband processor 551 integrates the Bluetooth protocol stack and various profiles (refer to FIG. 3 ), and is connected to the main processor 521 through a UART interface. Antenna 560 is used for receiving and sending wireless signals, and is connected with Bluetooth wireless transceiver; Codec (CODEC) 540, one end is connected with Bluetooth module 550 through a pulse code modulation (PCM) interface, and the digital voice on the Bluetooth module side The signal is converted into an analog signal; the other end is connected to the GSM/GPRS module 520 through an analog signal interface, and the analog signal on the GSM/GPRS module side is converted into a digital signal. Other peripheral equipment 530, including SIM card interface circuit, receiver and loudspeaker, etc., are used for functions required by traditional cellular phones and Smart Phones.

Fig. 5 explains the manner of information exchange between the main processor and the Bluetooth baseband processor in the Bluetooth cellular phone realized according to the present invention. First, the main processor sends a command to the Bluetooth baseband processor to perform initial configuration (S100). The command may be in the format of an AT command. For example, use "ATBTCONF n0n1n2" to set a record, where n0 is the record type in hexadecimal; n1 is the record length in hexadecimal; n2 is the record content in hexadecimal. After receiving the command, the Bluetooth baseband processor performs the configuration operation, and returns "OK" if successful, otherwise, returns "ERROR". Next, implement specific functions. Here, it is taken as an example that the cellular phone needs to be paired with a designated Bluetooth headset (Pairing) (S110). The main processor sends a command to the Bluetooth baseband processor, requesting to enter the waiting state for pairing (S120). For example: "ATBTWAITn0n1". Among them, n0 is the type of device that is allowed to be paired with it, represented by a numeric character, 0 is all devices; 1 is earphone; 2 is computer; and so on. n1 is the personal information code (PIN) required for this pairing. The waiting time for pairing can be set with another AT command "ATBTSET". The response of the Bluetooth baseband processor is to return the name of the earphone and an index number after the pairing is successful (S140, S130). This index number can be used to obtain information about the headset at a later date. After the main processor receives the response, it can notify the user of the result via the man-machine interface (S140).

As mentioned above, since the applications related to Bluetooth are integrated into the Bluetooth baseband processor, the work of the main processor is greatly simplified. For ordinary technicians, they can master the interface rules of the Bluetooth baseband processor in a short period of time, so that products with Bluetooth functions can be developed relatively quickly.

While the present invention has been shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that changes in form and details may be made without departing from the spirit and scope of the invention as defined in the appended claims. of various changes.

Claims (4)

1, a kind of equipment that adds bluetooth function on existing cellular phone and Smart Phone platform, it is characterized in that: described equipment comprises: A man-machine interface unit is used for man-machine interaction, and the man-machine interface unit is connected with the main processor; GSM/GPRS module, used to realize codec and voice coding of GSM/GPRS or CDMA baseband, this GSM/GPRS module includes a main processor, and the built-in digital signal processor DSP, microcontroller, SRAM and flash memory of the said main processor unit; the radio frequency module completes the sending and receiving of radio frequency signals; the power management module is used to manage the power supply of the equipment; Bluetooth module, including a baseband processor and a wireless transceiver device, used to realize the control of the link manager, baseband controller, wireless transceiver and link management protocol function module; The baseband processor integrates the Bluetooth protocol stack and various application frameworks at the same time, and is connected to the main processor through the UART interface. The baseband processor can implement the Bluetooth service discovery protocol SDP, serial port emulation protocol RFCOMM, telephone control The control and adaptation protocol L2CAP and the control of the driver function module of the host control interface HCI, the various application frameworks include the general access application framework GAP, the man-machine equipment application framework HID, the service discovery application framework SDAP, the cordless phone application framework CTP, Internal phone application framework ICP, car hands-free phone application framework HFP, headset gateway application framework HSP/AG, serial port application framework SPP and object push application framework OPP; An antenna, used to realize the reception and transmission of wireless signals, and connected with the wireless transceiver device; CODEC, one end of which is connected to the Bluetooth module through a pulse code modulation interface, converts the digital voice signal on the Bluetooth module side into an analog signal, and the other end is connected to the GSM/GPRS module through an analog conversion of analog signals into digital signals; and Other peripheral devices, including SIM card interface circuits, receivers and speakers, are used to realize the functions required by traditional cellular phones and Smart Phones. 2. The device according to claim 1, wherein the human-machine interface unit is a button, a light emitting diode, a keyboard, or a liquid crystal display. 3, a kind of method that adds bluetooth function on existing cell phone and Smart Phone platform, it is characterized in that: described method comprises: (a) increase bluetooth module and codec CODEC circuit in the hardware structure of existing cellular phone and Smart Phone; (b) Integrating the Bluetooth protocol stack and multiple application frameworks in the Bluetooth baseband processor; (c) A transport layer interface in UART format between the main processor and the Bluetooth baseband processor of the cellular phone and the Smart Phone; (d) The information exchange between the main processor and the Bluetooth baseband controller of the cellular phone and Smart Phone does not use the HCI protocol of the Bluetooth standard, but uses a custom message. 4. The method according to claim 3, characterized in that: said multiple application frameworks include general access application framework GAP, man-machine device application framework HID, service discovery application framework SDAP, cordless telephone application framework CTP, internal telephone Application framework ICP, vehicle hands-free phone application framework HFP, headset gateway application framework HSP/AG, serial port application framework SPP and object push application framework OPP.

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