【導(dǎo)讀】藍(lán)牙技術(shù)是一種無線數(shù)據(jù)與數(shù)字通信的開放性規(guī)范。它以低成本、近距離無。線連接為基礎(chǔ),為固定與移動(dòng)設(shè)備建立了一種完整的通信方式和技術(shù)。范圍內(nèi)的互操作通道。在一般的傳感器或測(cè)試儀表中,大量使用CPU控制下的數(shù)字?；夹g(shù),因此,許多控制系統(tǒng)或傳感器系統(tǒng)已經(jīng)實(shí)現(xiàn)了數(shù)字化傳輸。輸,這對(duì)于許多應(yīng)用領(lǐng)域都是十分重要的。藍(lán)牙技術(shù)規(guī)范版本作了如下規(guī)定。免申請(qǐng)的無線電頻段。②采用快速確認(rèn)和跳頻技術(shù),以確保鏈路的穩(wěn)定。③采用二進(jìn)制調(diào)頻技術(shù)的跳頻收發(fā)器,抑制干擾和防止衰落。④采用前向糾錯(cuò)技術(shù),抑制長(zhǎng)距離鏈路的隨機(jī)噪聲。⑥采用時(shí)分雙工傳輸,其基帶協(xié)議是電路交換和分組交換的結(jié)合。據(jù)和同步語音的通道。藍(lán)牙協(xié)議包括核心協(xié)議層、替代電纜協(xié)議層、電話控制協(xié)議層和選用協(xié)議層。鏈路管理器之間的通信協(xié)議稱為。塊3部分,負(fù)責(zé)處理LMP層、基帶層與RF層的協(xié)議。鏈路管理器與基帶層芯片合稱為鏈路控制器。RF射頻發(fā)射組件,與主機(jī)相連接的接口位于鏈路控制器上。

　　

【正文】 the control system, intelligent sensor collection and sorting good data, need to transfer to the core of the system controller or other control unit. Due to the characteristics of the control system, the data transmission generally need to pass a space distance, therefore, need to use special circuit and the way to realize data transmission. For example, to encode data processing, the use of current ring or RS232 and transmission. In the existing control system, the vast majority of cases are using cable transmission way realization sensor and control system of the connection. For intelligent sensor for, transmission data quantity generally and is not very big (such as pressure, temperature sensor and so on), therefore, meet the need of the intelligent sensor embedded bluetooth SoC device, does not need very large storage capacity。 But must consider bluetooth protocol to achieve the necessary program storage space. Bluetooth protocol stack processing software will take up more memory, so, we must carry on the simplified. At the same time, in order to ensure safe and reliable control system, also need to consider using user agreement alternative bluetooth defined treatment protocol. From the above analysis we can draw the conclusion: (1) intelligent sensor data transmission quantity is small, do not need to undertake pression or coding processing, can be installed in the 1 k bytes. (2) in order to ensure the safety and reliability of the control system, it is necessary to put the upper treatment protocol into user layer protocol, by the user to write. In order to design meet the intelligent sensor embedded bluetooth SoC structure of bluetooth protocol stack for a simplified treatment, only use the key agreement bluetooth protocol and alternative cable agreement. SoC of bluetooth protocol stack by software and hardware of two parts. The core in the agreement of baseband agreement by the hardware realization, and link management and other part use software to realize. All the relevant agreement software stored in ROM, the user use munication stack can directly call. It should be pointed out that, munication stack design as a whole, so called must also be whole call. In other words, the munication stack as a plete subroutine modules to call. According to the above conclusions, the paper proposes a kind of have to open the user agreement embedded bluetooth SoC modular structure. RF transceiver, baseband, controller and bluetooth protocol ROM posed bluetooth protocol stack. Bluetooth protocol stack in under the control of CPU plete munication tasks. Simplified embedded bluetooth protocol stack structure. The user application protocol by the user to design, to ensure the safety and reliability of the munication. In addition, the influence of the bluetooth protocol stack of LMP the corresponding simplified. In the application of intelligent sensor, the munication link is pared monly simple, therefore, LMP don39。t need to link to carry on plicated processing. This design, the main function of LMP by software. When need to use bluetooth munication to send data or receiving data, the user program just call LMP software module can. LMP agreement consists of two parts (1) software. Through the CPU to link to set and control, realize bluetooth connection, power control and the authentication and encryption, but also control bluetooth device controller circuit. (2) the hardware. LMP controller circuit in the operation of LMP software, control bluetooth device working condition (keep hold, dormancy park, breathing sniff and activities active). From the above module design results can be seen, the structure of the intelligent sensor with plete bluetooth munication function, at the same time, provide the user with the flexibility of application. For example, the LMP authentication and encryption method and algorithm pletely by the user to decide, providing the user reliability and safety of the system. In addition, due to the universal serial munication interface and test circuit of existence, for the user the system to provide the hardware test hardware support. According to the above analysis, we can get used to intelligent sensor embedded bluetooth SoC device circuit structure. The bluetooth protocol stack into the intelligent sensor, in order to control the system to provide the very flexible position way。 At the same time, through the use of the corresponding safety measures, can improve the reliability and safety of the system. This article analysis bluetooth protocol stack and intelligent sensor work characteristic , design of intelligent sensor embedded bluetooth protocol stack of SoC structure. In order to meet the application of intelligent sensor, embedded bluetooth SoC, CPU, memory and corresponding bus and external circuit should be open to the users. As for the user, as long as the appropriate design of sensor front end circuit, can form a bluetooth munication function of intelligent sensor. Because of bluetooth munication protocol operating functions have been stored in ROM, so users only need to call the corresponding software program can plete bluetooth munication. At the same time, the SoC of bluetooth protocol stack on the authentication and encryption part of open to the users, specific the authentication, encryption method and algorithm can be defined by the user to.