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USB+ device driver for Linux Bluetooth contract stack

Abstract: Based on the analysis of the BlueZ source code of the Bluetooth contract stack under Linux, the organizational structure and characteristics of BlueZ are given. Analyze the Bluetooth USB transmission driver mechanism and data processing process, provide the important data structures and processes for implementing Bluetooth device drivers, and summarize the common techniques and key technologies for developing Bluetooth USB device drivers under Linux. Keywords: Linux system; Bluetooth contract stack; device driverUSBDeviceDriverforLinuxBluetoothStackLIANGJun-xue,YUBin(InstituteofElectronicTechnology,PLAInformationEngineeringUniversity,Zhengzhou450004)[Abstract]This paper describes the structure and characteristics of BlueZ based onanalyzing the source code of Linux bluetoothstack Blue Z. Itanalyzes the implementation of blueto othUSBtransportdriverschemeanddataprocessingprocedureindetail,andgivesthekeydatastructureandimplementationofbluetoothdevicedriver.ItsummarizestheapproachofdevelopingLinuxbluetoothUSBdevicedriverandthekeytechnology.【Keywords】Linuxsystem;bluetoothstack;devicedriverComputer EngineeringVolume 34 Issue 9 Vol.34No.9 May 2008 · Development Research and Design Technology · Article Number: 1000-3428 (2008) 09-0273-03 Document Code: A Chinese Category Number: TP3911 Overview Bluetooth technology is an open communication specifications, and Linux is an open source operating system.

The combination of cheap devices and free software has promoted the development and integration of Bluetooth technology and Linux. The earliest Bluetooth contract stack for Linux is the OpenBT contract stack released by Axis Communication Inc in 1999. Since then, IBM released the BlueDrekar contract stack, but did not disclose its source code. The BlueZ contract stack released by Qualcomm Incorporated in 2001 was adopted as part of the 2.4.6 kernel. It is reported that RapporeTechnology and Nokia's AffixBluetoothStack are both Bluetooth contract stacks under Linux systems and are used in different devices and fields. BlueZ is the official Bluetooth contract stack for Linux and is currently the most widely used contract stack, supporting almost all certified Bluetooth devices. For host-based Bluetooth applications, currently common hardware sockets include UART, USB, and PC cards. As a standard peripheral socket for PCs, USB has the characteristics of convenient connection, good compatibility, and support for high-speed devices.linux kernel network protocol Stack, has been widely used in Bluetooth devices. At present, the research on USB device drivers under Linux has been relatively extensive and in-depth [1-4], but there is no special research on Bluetooth device drivers under Linux. Based on the analysis of USB device drivers and Bluetooth contract stacks, this article summarizes the common techniques for developing Bluetooth USB drivers under Linux, and discusses its key technologies in depth.

2Linux Bluetooth contract stack BlueZ Introduction BlueZ has now become an open source project. It can run well on various hardware platforms supported by Linux, including various single-processor platforms, multi-processor platforms and hyper-threading systems. BlueZ is composed of multiple independent modules. The kernel space mainly includes device driver layer, Bluetooth core and HCI layer, L2CAP and SCO audio layer, RFCOMM, BNEP, CMTP and HIDP layer, general Bluetooth SDP library and background services and all-layer Standard socket socket; provides tools for Bluetooth configuration, testing and contract analysis in user space. Its organizational structure is shown in Figure 1. BlueZ does not implement a dedicated SDP layer, but implements it as a Bluetooth service library interpreter running in the background (the background service is not depicted in Figure 1). The RFOMM layer supports standard sockets and provides a serial emulation TTY socket, which allows serial port applications and contracts to run on Bluetooth devices without modification. Linux transplantation, such as point-to-point contract PPP based on TCP/IP All network applications of the contract cluster. The BNEP layer implements Bluetooth's Ethernet emulation, and TCP/IP can run directly on it. USB device driver (hci_usb.o) L2CAP layer (l2cap.o) RFCOMM layer (rfcomm.o) BNEP layer (bnep.o) CMTP layer (cmtp.o) Parallel port device driver (hci_uart.o) Virtual parallel port device driver (hci_vhci .o) Audio socketRFCOMMsocketBNEPsocketCMTPsocketL2CAPsocketHCIsocketKernel spaceUser spaceParallel port deviceCAPI deviceInput deviceNetwork deviceHDIPsocketAudio deviceAF_BLUETOOTHsocketAudio layer(sco.o)PPPTCP/IPAF_INETsocketBNEP layer(bnep.o)Other device drivers(bluecard_cs.o, etc.)BlueZ tool and Utility HDIP layer (hdip.o) BlueZ core and HCI layer (bluez.o/bluetooth.o) Figure 1 BlueZ organizational structure 3 Bluetooth USB device driver The device driver plays an important role in the Linux kernel, which enables a certain hardware to Responds to a well-defined internal programming socket. This socket hides the details of how the device works, allowing the user to operate the device through a set of standard calls that are independent of a specific driver. It is the driver's job to map such calls to specific operations on the actual hardware device.

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Linux kernel IPSec (xfrm) contract stack source code analysis

This document starts with source code analysis and analyzes the process of sending and receiving data packets in the Linux kernel and the process of kernel routing query. It clearly analyzes how a data packet enters the kernel ipsec contract stack through query routing, the detailed encryption and decryption process of the Linux kernel ipsec contract stack, and how to send the data packet out after the encryption and decryption. The first half of the document mainly introduces some key data structures and their relationships with each other. The second half introduces the calling hierarchical relationship of each function. The document mainly analyzes the ESP contract in ipsec tunnel mode as an example. The source code of key parts of the document are marked with English comments.

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Linux2.6 kernel contract stack source code analysis

In-depth, helpful for those who want to have a deeper understanding of the Linux kernel contract stack

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Linux kernel contract stack source code analysis

Linux kernel contract stack source code analysis

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Linux kernel contract stack SCTP contract processing brief description

The document briefly describes the basis of SCTP implementation in the Linux kernel and related code processes. You are welcome to communicate with each other

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Linux kernel network stack source code situation analysis.pdf

This book mainly provides a detailed analysis of all the source code of the Linux 1.2.13 kernel contract stack. All the codes of this version are in a folder, and each contract implementation has only one file corresponding to it. Analysis of this version The source code allows readers to quickly understand the Linux network contract structure. This book is divided into 5 parts. Specific contents include analysis of the overall architecture of the network stack, analysis of network contract header files, analysis of BSDsocket layer implementation, analysis of INETsocket layer implementation, analysis of network layer implementation, analysis of link layer implementation, analysis of network device drivers, system network stack initialization, etc. . This book is suitable for Linux network developers and Linux kernel enthusiasts.

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Linux kernel network stack source code situation analysis

"Linux Kernel Network Stack Source Code Scenario Analysis" mainly provides a detailed analysis of all the source code of the Linux 1.2.13 kernel contract stack. All codes in this version are in one folder, and the implementation of each contract has only A file corresponds to it, and analyzing the source code of this version can facilitate readers to quickly understand the Linux network contract structure. , "Linux Kernel Network Stack Source Code Scenario Analysis" is divided into 5 parts. Specific contents include analysis of the overall architecture of the network stack, analysis of network contract header files, analysis of BSDsocket layer implementation, analysis of INETsocket layer implementation, analysis of network layer implementation, analysis of link layer implementation, analysis of network device drivers, system network stack initialization, etc. . , "Linux Kernel Network Stack Source Code Situational Analysis" is suitable for Linux network developers and Linux kernel enthusiasts to read.

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linux kernel contract stack analysis

Linux kernel contract stack calls parsing, and the data packet moves towards the process. Network packets move towards

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Implementation of Linux kernel contract stack

A very detailed schematic diagram. After understanding it, you will have a deep understanding and knowledge of the Linux network contract stack. Illustrations of sockets, IP messages, IP fragmentation, forwarding, bridges, etc.

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Linux kernel system file interpretation

Linux kernel system file interpretation

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linux kernel contract stack TCPtime_wait principle, optimization, side effects 1

3.3timestack data packet-Wireshark3.4 kernel contract stack related main source code Time_wait state generation and rapid recovery related code: loss caused by turning on timestamps

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Linux kernel contract stack source code analysis (2.6.18 kernel)

Colleagues who want to learn the Linux kernel are highly recommended books that cannot be missed

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Linux kernel network stack source code situation analysis_12390610.pdf

Linux kernel network stack source code situation analysis

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Linux kernel contract stack analysis

Describes in detail the implementation principle of the Linux kernel contract stack and related data structures red hat linux, providing an important reference for analysts of the Linux kernel contract stack.

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Linux kernel network system interpretation

Linux kernel network system interpretation; very good information

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Linux kernel network stack source code situation analysis.part5.rar

Mainly conducts a detailed analysis of all the source code of the Linux1.2.13 kernel contract stack. All codes of this version are in one folder, and each contract implementation has only one file corresponding to itlinux kernel network Protocol Stack, analyzing the source code of this version can help readers quickly understand the Linux network contract structure. The last part of the compressed package.

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In-depth analysis of linuxtcp/ip contract stack

Comprehensive analysis of the network contract stack of the Linux kernel, especially suitable for learning the source code of the Linux network contract stack

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