Abstract: Through the study of the Host Control Interface of Bluetooth Core Specification 1.2, the communication mechanisms and methods of the Bluetooth Baseband layer and the host side are analyzed. Some basic Bluetooth commands and events are illustrated, and related interfaces are explained. On this basis, the development of the Bluetooth HCI Layer is convenient.Key words: Bluetooth; HCI; baseband; Traff
For more information about the HCI specification, see First, we need to understand that the host part of HCI is implemented on Linux.1. Related Data Structure 1.1 Hci_devIn Linux, Hci_dev is used to represent an HCI Host (corresponding to a control)
Members
Role
Char Name[8]
Bluetooth name
__u8 Bus
Android blueZ HCI (I): Implementation of hciconfig and common methods
Keywords: hciconfighcitool hcidumpAuthor: xubin341719 (You are welcome to reprint it. Please indicate the author. Please respect copyright. Thank you !)Correct the mistakes and learn and make progress together !!Android blueZ HCI (I): Implementation of hciconfig and common methodsAndroid blueZ hci
Keywords: Bluetooth protocol HCI Anatomy HCI Overview HCI Note LMP l2cap SDP RFCOMMZhongjunIn the spirit of mutual learning purposes, to share this series of articles, welcome reprint, please specify the author, respect for copyright, thank youPlease correct me if the article is not in the wrong place, learn togetherThis series is currently intended to:LMP anatom
There are multiple threads in the Bluetooth process, where the HCI thread is responsible for processing and sending and receiving the Bluetooth host side and controller.This article analyzes the process of data processing for this thread.1. HCI-related interfacesFirst look at the related interfaces of HCI: in HCI_LAYER.C: const hci_t *hci_layer_get_interface ()
Dsads1. OverviewHCI supports four types of grouping:
Command group commands Packet
Asynchronous data grouping asynchronous Packet
Synchronous Data Packet
Events Group Event Packe
The grouping type is a byte value before the HCI group. The packet type has the following values:
Packet
Packet Type
command
1
asynchronous
Data Structure 1, hci_event
Indicates the hardware status of the Bluetooth controller.
Enum hci_event {
Device_up, device Enabled
Device_down: Disable the device.
The device_error device has an error.
};
Header file: bt_hcip.h2. hci_type
Indicates the data packet type.
enum HCI_TYPE {
Command_packet = 1, command package
Data_packet_acl = 2, access control list data
Data_packet_sco = 3, connection-oriented data synchronization
Event_packet = 4, event
Etype_finish = End mark of 5 packets
};
Header
, and traverse tasklet_actionThe tasklet_vec linked list calls each tasklet function to complete the Soft Interrupt operation.That is, call hci_rx_task ()
That is, when urb exists, hci_rx_task () is finally called ()
When the package type is HCI event, call hci_event_packet ()In hci_event_packet (), the system determines the event and processes it.
The following uses hci_ev_disconn_complete as an example to see how the event is processed. This event i
[2] creating a more approachable Web site within 30 days
Hci/chi (Human-computer interaction)--human-computer interaction
Human-Computer Interaction CHI (Computer Human interaction), also known internationally (Hci,human Computer interaction), is an interdisciplinary study that covers a wide range of topics, including cognitive science in the field of psycho
Recently in a customer to the master-slave module, based on the S130, a little farther away from the connection will appear immediately after the phenomenon of disconnection,Traced the reason, given the HCI Error code is 0x003e, for the moment do not know what the ghost, check out a post on the Internet, explained as follows:Disconnect reason 0x3e Hci_error_code_conn_failed_to_establish
I use TI CC2640 master machine, mobile phone do from the mach
Accessibility-Accessibility/Accessibility
Accessibility indicates the Accessibility of the webpage. W3C Web page accessibility is defined as follows:
"Webpage accessibility is accessible to people with disabilities. More specifically, the availability of web pages means that people with disabilities can perceive, understand, manipulate, interact with, and contribute to webpages. Web Accessibility also benefits non-Persons with disabilities, including the elderly who are weak due to a
In the process of Bluetooth enable, multiple threads are created and the threads are bound to the queue. This article mainly analyzes the processing of HCI data this thread.voidBtu_startup (void){. .. btu_bta_msg_queue=fixed_queue_new (Size_max);Btu_general_alarm_hash_map=hash_map_new (btu_general_alarm_hash_map_size, Hash_function_pointer, NULL, (DATA_FREE_FN) alarm_free, NULL) ;Btu_general_alarm_queue=fixed_queue_new (Size_max);Btu_oneshot_alarm_has
Contents of Beijing Union University
Smart City College
School of Tourism
College of automation
Business School
College of Art
[Email protected]HCI Practice 005-Web page layout
Http://www.mathworks.cn/company/events/archived_webinars.html? S_cid = hp_e_rw
Events-recorded webinarsLearn more about Mathworks products through these one-hour recorded online seminars. To view a webinar, select a language and topic, then complete
First, this article is used for writing essay, is a kind of thought record, also can be seen as my essay when writing the log record.Second, it is still in the data collection stage. I'm going to write about the interaction on wearable devices
1. HCI Layer Protocol Overview:Host Controller Interface (HCI) is used to communicate the host and module. Host is usually pc,module is connected to a Bluetooth Dongle on the PC in various physical connection forms (Usb,serial,pc-card, etc.). At the end of the host: Application,sdp,l2cap and other protocols are presented in the form of software (BlueZ in the kernel layer program). At this end of the module:
and printer respectively, and then you can print them wirelessly. The entire process is transparent to the original printer driver, which provides great convenience for printer users.
MCU Control Over bluetooth moduleFigure 3 Bluetooth HCI Transport Layer The Bluetooth specification defines the Host Control Interface (HCI), which provides standard command interfaces for baseband controllers, hardware contr
Article Source: http://www.limodev.cn/blogAuthor contact: Li xianjing
I took a look at the Bluetooth protocol document yesterday. Today, I simply checked the code in the kernel (bluez). Here I take some notes, but I still inherited the old problem. I only paid attention to the overall process and ignored the details, first, let's take a look at it and analyze it carefully when necessary.
Net/hci_core.c
The driver of HCI on the host is mainly to provi
I took a look at the Bluetooth protocol document yesterday. Today, I simply checked the code in the kernel (bluez). Here I take some notes, but I still inherited the old problem. I only paid attention to the overall process and ignored the details, first, let's take a look at it and analyze it carefully when necessary.
Net/hci_core.c
The driver of HCI on the host is mainly to provide a unified interface for the upper layer, so that the upper layer pro
Yesterday, I looked at the introduction of Bluetooth protocol documents, today simply looked at the code in kernel (BlueZ), here to note, or inherited the old habits,
Only focus on the overall process and ignore the details, first understand the approximate, and so on when the real need to carefully analyze.
Net/hci_core.cThe main driver of HCI is to provide a unified interface for the upper layer, so that the upper layer protocol does not depend on t
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