bluedroid

Keywords: bluedroid initnative enablenative btif_task btu_taskbt_hc_work_thread set_power preload GKIxubin341719 (Welcome reprint.) Please specify the author, please respect the copyright. Thank you. )Welcome to correct mistakes, common learning, common progress!!first, the Bluetooth open process overview, for example, as seen in: init, enableSame as the normal function call. Android upper layer via App-->native-->jni-->bluetoothinterface-->bluetooth

Key words: Bluedroid BlueZxubin341719 (Welcome reprint, please specify the author, please respect copyright, thank you!) )Welcome to correct mistakes, common learning, common progress!!First, the noun explanation: (the useful information increases in ...)BTI F: Bluetooth InterfaceBTU: Bluetooth Upper LayerBTM: Bluetooth ManagerBTE: Bluetooth Embedded SystemBTA: Blueetooth Application LayerCO: call Out\ci:call inHF: Handsfree profileHH: HID Host Profil

Keywords: bluedroid initnative enablenative btif_task btu_taskbt_hc_work_thread set_power preload GKIxubin341719 (Welcome reprint, please specify the author, please respect copyright, thank you!) )Welcome to correct mistakes, common learning, common progress!!first, the Bluetooth open process overview, as shown in: Init, enableAnd the general function calls the same, Android upper layer through App-->native-->jni-->bluetoothinterface-->bluetooth hciin

BlueDroid GKI and bluedroid gki1. Overview GKI to library libbt-brcm_gki.so (Static Lib ?) To BlueDroid. This layer is an adaptation layer that adapts to OS-related processes and memory-related management and can be used to transmit messages between threads.The gki_cb variable is used to centrally manage processes. typedef struct{ pthread_mutex_t GKI_mutex

Android Bluetooth how to (Based on Android L bluedroid)Continuous update ...1. How to enable Btsnoop log?A) UI settings-->b) Developer options-->c) Reboot Tablet, then snoop Log would locate In/sdcard/btsnoop_hci.log (this path can be configured In/etc/bluetooth/bt_ stack.conf)2. IF Developer Options Default not enabled, you can use following steps to enable itA) settings-->b) About tablet-->c) Click 4 or 5 times or more in Build number-->D) Then, Dev

1. Overview Gki to library libbt-brcm_gki.so (static Lib ?) To bluedroid. This layer is an adaptation layer that adapts to OS-related processes and memory-related management and can be used to transmit messages between threads.The gki_cb variable is used to centrally manage processes. typedef struct{ pthread_mutex_t GKI_mutex; pthread_t thread_id[GKI_MAX_TASKS]; pthread_mutex_t thread_evt_mutex[GKI_MAX_TASKS]; pthread_c

Sending and receiving an ACL package for bluedroid source code analysis (2) For more information, see my personal website:Http://stackvoid.com/ The previous section describes the data stream entry. This article analyzes the processing functions of L2CAP.Processing at The L2CAP Layer Our music data, through the L2CAP entry function l2c_data_write layer-by-layer "test", has successfully entered the L2CAP. Next let's take a look at how the L2CAP layer pr

1. OverviewGki to Library libbt-brcm_gki.so (Static Lib?) In the form provided to bluedroid useThis layer is an adaptation layer that is adaptable to OS-related processes, memory-related management, and can also be used to pass messages between threadsThe unified management of process is realized mainly through variable GKI_CB2. Thread 2.1 Main function-Gki_init () Initialize variable GKI_CB-Gki_create_task () Create thread-Gki_destroy_task () Destroy

1. Overview Gki to library libbt-brcm_gki.so (static Lib ?) To bluedroid. This layer is an adaptation layer that adapts to OS-related processes and memory-related management and can be used to transmit messages between threads.The gki_cb variable is used to centrally manage processes. typedef struct{ pthread_mutex_t GKI_mutex; pthread_t thread_id[GKI_MAX_TASKS]; pthread_mutex_t thread_evt_mutex[GKI_MAX_TASKS]; pthread_con

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_hash_map=hash_map_new (btu_oneshot_alarm_hash_ma

1. Overview Gki to Library libbt-brcm_gki.so (Static Lib?) In the form provided to bluedroid use This layer is an adaptation layer that is adaptable to OS-related processes, memory-related management, and can also be used to pass messages between threadsThe unified management of process is realized mainly through variable GKI_CB typedef struct {pthread_mutex_t Gki_mutex; pthread_t Thread_id[gki_max_tasks]; pthread_mutex_t Thread_evt_mutex[gki

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.

The Bluetooth protocol stack on Android 4.4 uses the BRCM and Google co-developed bluedroid, instead of the previous BlueZ. One, Bluetooth source distribution (based on Android 4.4) 1. Packages/apps/settings/src/com/android/settings/bluetooth bluetooth Settings code 2. Packages/apps/bluetooth BT application layer code, and BT profile (eg: a2dp,gatt,hdp,hfp,hid,map,opp,pan,pbap ... ) Upper Code Packages/apps/bluetooth/jni 3. Frameworks/base/core/java/

From Android 4.2, the Bluetooth Stack has undergone a major change: From bluez to bluedroid jointly developed by Google and Broadcom (of course, the core part is still Broadcom, google is mainly engaged in the upper-layer framework ). You can use http://source.android.com/devices/javasth.htmlto obtain a new BluetoothStack architecture. In general, there are few relevant documents, mainly by reading the code for in-depth understanding. Compared with bl

starting with Android 4.2, a major change has taken place in the Bluetooth stack: from BlueZ to Bluedroid, which was developed jointly by Google and Broadcom (of course, the core part is Broadcom, Google is mostly doing the parts related to the upper framework). the http://source.android.com/devices/bluetooth.html can be used to understand the architecture of the new Bluetooth stack in general, with few related documents, Read the code for a deeper un

The following is an analysis of Bluetooth br/EDR enable process based on Android 4.2 code. The descrithadapter class represents the local device Bluetooth adapter, while the descrithdevice class represents the remote Bluetooth device. In Android 4.3, we introduced a new class named explorthmanager, which is a high-level manager used to "to obtain an instance of an Elastic thadapter ".And conducting CT overall Bluetooth management ". The Bluetooth enable process is complex and has many layers. Th

/bluetoothheadsetclient.java / Frameworks/base/core/java/android/bluetooth/bluetoothheadsetclientcall.java /packages/apps/ Bluetooth/src/com/android/bluetooth/hfpclient/headsetclienthalconstants.java /packages/apps/ Bluetooth/src/com/android/bluetooth/hfpclient/headsetclientservice.java /packages/apps/bluetooth/ Src/com/android/bluetooth/hfpclient/headsetclientstatemachine.java /packages/apps/bluetooth/jni/ Com_android_bluetooth_hfpclient.cpp /hard

"Digitizer * Drivers to Windows touch and pen-based Computers" */ #define Hid_dg_c Onfidence 0x000d0047 #define HID_DG_WIDTH 0x000d0048 #define Hid_dg_height 0x000d0049 # Define Hid_dg_contactid 0x000d0051 #define Hid_dg_inputmode 0x000d0052 #define Hid_dg_ Deviceindex 0x000d0053 #define Hid_dg_contactcount 0x000d0054 #define HID_DG_CONTACTMAX 0x000d0055 Source: https://elixir.bootlin.com/linux/v4.4/source/include/linux/hid.h#L338Each represents a different meaning. An

android_bluetooth_headsetbase.cpp android_bluetooth_common.cpp Android_bluetooth_ BluetoothAudioGateway.cpp android_bluetooth_bluetoothsocket.cpp android_bluetooth_scosocket.cpp Android_server_ BluetoothService.cpp android_server_bluetootheventloop.cpp android_server_bluetootha2dpservice.cpp Android_server _watchdog.cpp android_message_digest_sha1.cpp android_ddm_ddmhandlenativeheap.cpp Com_android_internal_os_ ZygoteInit.cpp Com_aNdroid_internal_graphics_nativeutils.cpp Android_backup_backupda

/com/android/bluetooth (compiled into the system in the form of javasth.apk) Native space: The second layer starts from the local JNI called by the service under packages/apps/Bluetooth and calls the definition in hardware (hardware/libhardware/include/hardware/bluetooth.hhardware/libhardware/include/hardware/bt_*.h), Bluetooth. default. so is implemented in external/bluetooth/bluedroid This is the core protocol stack of bluetooth. It can be seen tha