nutanix hci

Bluetooth protocol stack uses bluez to support application specifications such as gap, SDP, and RFCOMM, and has obtained sig certification. Since bluez uses GPL authorization, the android framework uses D-BUS IPC to interact with bluez's user space code to avoid unauthorized code. Some Bluetooth header files:Include/NET/Bluetooth/hci_core.h Include/NET/Bluetooth. h Bluetooth source code file: Net/Bluetooth /* Files in the Bluetooth driver section: Drivers/Bluetooth /* Bluetooth drivers are gene

(); return false; } ............................. } Mblustmthservice. enablenative () calls the enablenative method of javasthservice, that is, the JNI method. Therefore, it enters android_server_gatethservice.cpp: static jint enableNative(JNIEnv *env, jobject object) {#ifdef HAVE_BLUETOOTH LOGV("%s", __FUNCTION__); return bt_enable();

agreed time period, both parties communicate to a specified physical channel. Among them, "agreed time period", is the concept of cent. And "to the specified physical channel" is the concept of frequency hopping. The following analysis will be carried out around these two concepts.In addition, and "Bluetooth Protocol Analysis (5) _ble Broadcast Communication related technical analysis" similar, we will also from link layer, HCI, gap three levels

FunctionThe default value of x is 0x7F.10: INT [13], enabling the INT13 feature of the hard disk. This feature provides support for some disk tools (such as FDISK.11: DMA [SAFE], which is allocated to the DMA security buffer used in data transmission. This parameter must be specified when running applications that need to allocate buffer from the extended memory.12: NOU [HCI] to prevent uhci usb controller from being initialized.13: NOO [

, in the switch to the USB, a preliminary look at this Serial App, on this page can download an HCI Tester script test tool,Not directly through the two serial port to achieve data transmission, the need for the upper profile and HCI Command. Attached address: http://processors.wiki.ti.com/index.php/LPRF_BLE_SerialApp 4, Btool tool by connecting the USB dongle to see the software options, try to connect two

computer. This option enforces the need for a password backup and storage.?? 3, stay awake (keep awake): Select this check box will force the screen to wake up, as long as the connection on the USB cable or charging will not go to sleep, when the need to debug the time to not always go to unlock, quite convenient. 4. Select runtime (Choose Runtime): You can choose Dalvik or art. Art is still experimental until the Android L finally release. 5, enable Bluetooth

processors by handling some of the workload of the main CPU.(4) Rf:radio frequency RF partThe transmitting part of the wireless signal, such as telephone, Bluetooth, WiFi signal transmitting, receiving.2. Simple Tablet PC block diagramAP Chip + Peripheral +android System3. Bluetooth hardware interface block Diagram (for example, UART interface chip)(1) UART part: Serial port. Mainly responsible for transmitting data;(2) PCM part: Voice interface, used for voice transmission data during call;(3)

Implementation of Bluetooth protocol stack under Linux. Linux open Bluetooth protocol stack mainly includes IBM's Bluedrekar,nokia company's affix, axis company OPENBT and the official protocol stack BlueZ. We mainly face the BlueZ to discuss. The BlueZ base code is completed by Maxim Krasnyansky. Includes: Hci,l2cap,rfcomm and implementation of basic socket. He works for Qualcomm (Qualcomm). Marcel Holtmann Development layer protocols and applicatio

function The default value for X is 0x7f. 10:INT[13], enable INT13 feature support for the hard drive. This feature provides support for some disk tools, such as Fdisk. 11:dma[safe], which allocates DMA security buffers used in data transfer. This parameter must be specified when running some buffered applications that need to be allocated from extended memory. 12:NOU[HCI] To prevent initialization of the UHCI USB controller. 13:NOO[

There are two methods in general: one is to writeProgramWhen the test mode is added, another way is to send the HCI command through the PC to enter. The method to add the test mode to the underlying program is to add the connectionenterdutmod call to the program. Sending commands via PC is a little more complicated. The specific steps are as follows: Use the pstool tool to enable the Bluetooth chip through SPI or UART, modify VM disable it

position of L2CAP In the Bluetooth protocol stack is as follows: That is to say, all L2CAP data is transmitted to the remote device through HCI. Most of the data in the upper-layer protocol is also transmitted through L2CAP. L2CAP can send command. Such as connection and disconnection. The following is an example of command: Connection Request: In this case, we need to note that The L2CAP uses The L2CAP Connection Request (Connection Request)

The author's blog address: http://blog.sina.com.cn/samzhen1977By Sam (zhufeng)Sam_code@hotmail.com We have discussed how to use IOCTL to send HCI command. But HCIProtocol also has some commands, such as inquiry, which do not need to be sent using IOCTL. BluezSupport is provided directly, although they are all implemented in the same way. In the ApplicationProgramMedium:Hci_inquiry (dev_id, length, num_rsp, null, info,Flags );The following figur

workload of the main CPU.(4) Rf:radio frequency RF partThe transmitting part of the wireless signal, such as telephone, Bluetooth, WiFi signal transmitting, receiving.2. Simple Tablet PC block diagramAP Chip + Peripheral +android System3. Bluetooth hardware interface block Diagram (for example, UART interface chip)(1) UART part: Serial port, mainly responsible for data transmission;(2) PCM part: Voice interface for voice data transmission during call;(3) Power part: Power control.Third, the sof

flush_to_ldisc (struct work_struct *work) writes data to Disc-->tty_ldisc.c-->receive_buf ()-->hci_uart_ldisc.receive_buf= hci_uart_tty_receive;-->hci_ldisc.c-->hci_uart_tty_receive--> Give the data to the HCI layer { static void Hci_uart_tty_receive (struct tty_struct *tty, const U8 *data, char *flags, int count) { struct Hci_uart *hu = (void *) tty->disc_data; if (!hu | | TTY! = hu->tty) Return if (!test_bit (Hci_uart_proto_set, hu->flags))

1. Application of Paxos algorithmPaxos algorithm and Variant algorithm are widely used in distributed systems.Variants based on the Paxos algorithm are: ZAB, RaftFor example:? The Zab protocol in Zookeeper is also a variant of the Paxos algorithm. The zookeeper provides data consistency through the ZAB protocol for data consistency.? The strong consistency of metadata in each node is implemented by Paxos algorithm in Nutanix.2, what is the Paxos algor

Storevirtual complete decoupling of storage hardware and softwareLefthand introduced VSA (Virtual Storage Appliance) software in 2007 and was renamed Storevirtual Companion HP x86 Universal Server (DL, ProLiant, BladeSystem, etc.) in the second year by HP acquisition Sold together, followed by the introduction of Storeonce VSA. Storevirtual Natural support hardware and software decoupling, which is in line with the characteristics of SDS/SBS storage, due to simple deployment, architecture decoup

of the data center is redefined, rather than storage. But now so-called hyper-convergence, although the emphasis is on the data center computing, storage and network integration, but in my opinion also fused the computing and storage parts. The most famous of course in this field isNutanix, in .year-push computing and storage integrated machineNXfamily, the hardware platform isSupermicroof the2Udensity-optimized servers that support1-4two-way Intel Xeon node. Software,NutanixAdoptGoogleWell -kn

for some scenarios, such as virtual machine active image storage, or virtual machine hard disk file storage, as well as large data processing and other scenarios, object storage is stretched. The file system has outstanding performance in these areas, such as Nutanix's NDFs (Nutanix distributed Filesystem) and VMware's Vmfs (VMware Filesystem) perform well in virtual machine image storage, Google File System GFs and its open source implementation HDFs

at present, the "Hyper-integration scheme" is better, the traditional data center gradually transition to the new data center, so-called traditional data center HDDC refers to the data center superimposed by the hardware resources, and the new data center SDDC refers to the software-defined data center, Mainly refers to software-defined computing, software-defined storage and software-defined networks, the pursuit of a set of data center software to achieve centralized management and control of

efforts not only made Linux and MySQL robust, but also made SATA controllers and SATA disks reliable commodities. IDE drives, IDE ribbon cables, and Linux 2.2 give me the shivers. server-based flash was baked at scale within the data centers ofGoogle, Facebook, and numerous web-scale properties much before they were being discussed in the enterprise. had it been left in the hands of SAN companies, expensive SAS and esoteric OSes wowould have continued to cream the enterprise. incumbents want to