USB device endpoint
USB peripherals should contain a certain number of independent register ports and can be driven by USB devices.ProgramDirectly. These registers are the endpoints of the USB device. One device can have multiple endpoints, but all USB devices must have one zero endpoint for setting and control transfer.
Each device has a unique address allocated by the host, and each device has an
Vector concept:
If the endpoint of a line segment is ordered, we convert this line segment into a directed line segment ).If the start point P1 of the directed line P1P2 is at the coordinate origin, we can call it vector P2.
Vector addition and subtraction:
Set two-dimensional vector p = (x1, Y1), q = (X2, Y2 ),Vector Addition is defined as: p + q = (X1 + X2, Y1 + y2 ),Vector Subtraction is defined as p-q = (x1-X2, Y1-Y2 ).Obviously, p + q = q + p, p-
2.6. endpoints, pipelines, and interfaces
These three concepts are confusing during USB development. For USB operations in real environments, endpoints, pipelines, and interfaces cannot be ignored. The relationship between these three concepts is 2-6-1;
The USB physical endpoint. In the NXP lpc2478 USB, there are up to 32 physical endpoints, each endpoint from 0 to 31 has a fixed transmission mode (I/out).
Concept of vector:
If the endpoint of a line segment is ordered, we convert this line segment into a directed line segment ).If the start point P1 of the directed line P1P2 is at the coordinate origin, we can call it vector P2.
Vector addition and subtraction:
Set two-dimensional vector p = (x1, Y1), q = (X2, Y2 ),Vector Addition is defined as: p + q = (X1 + X2, Y1 + y2 ),Vector Subtraction is defined as p-q = (x1-X2, Y1-Y2 ).Obviously, p + q =
the management system. Therefore, the communication task must be delegated to different components. In terms of WCF, this component is called a WCF Service. In a more general sense, the WFC service is the software responsible for communicating with the outside world.
A WCF Service consists of the following three parts:
Service Class: A class marked with the [servicecontract] attribute, which may contain multiple methods. Except for marking some unique attributes of WCF, this class is no d
indicates no device protocol is used. 8 , // The maximum packet length supported by byte bmaxpacketsize0 endpoint 0, 0x04d8 , // Supplier ID of word idvendor USB device 0x003f , // Word idproduct USB product ID Zero X 0002 , // BCD code indicates the version number of the USB device, which is specified by the supplier. 0x01 , // Word bcddevice supplier string descriptor index value 0x02 , // Byte imanufacturer product string descriptor ind
The previous section describes the basic use of the Requests.get () method, and this section describes the use of the Requests.post () method:This article directory:I. Definition of methodsSecond, the Post method is simple to use1. Post with Data2. Post with header3. Post with JSON4, with the parameter of the post5, ordinary file upload6. Customized File Upload7, multi-File uploadFirst, the method definition:1, to the official document went to the next requests.post () method definition, as foll
Given a graph to find the shortest path of an endpoint (goal) to the rest of the endpoint or an endpoint, the easiest way to think of it is to take advantage of DFS, assuming that the average path from the beginning to an endpoint is N, the average adjacency endpoint for eac
USB urb (USB request block)
Kernel 2.6.29.4The USB device driver code communicates with all USB devices through urb. Urb uses the struct urb structure description (include/Linux/USB. h ).
Urb sends or receives data asynchronously from a specific endpoint of the same USB device. A USB device driver can allocate multiple URBS to one endpoint or reuse a single urb to multiple different endpoints Based on the d
:
Construction of three modes
To establish a required trust relationship for a database image, you can establish a trust relationship in a win environment in three ways: domain account, Certificate Trust, and anonymous Windows login, the configuration of the first two modes is described.
3.1 domain account mode:
3.1.1 change the MSSQLServer service logon method to domain account logon:
Log on to the Windows service console and change the service Logon account so that the domain account has the
This article is the second part of "getting started with WCF. This section describes the technical elements related to WCF, such as endpoint, host, address, binding, and contract. This article introduces the programming mode of WCF. Taking "Hello World" as an example, it explains how to define a WCF servicesuch as how to complete the communication between the client and the service, such as how to use the tool svcutil.exe andCodeClient. Iii. Technical
the Database master key (if the master key does not exist).
Create the certificate in the master database and encrypt it with the master key.
Create an endpoint (endpoint) with certificate authorization.
The backup certificate becomes a certificate file.
Create a login account on the server to provide additional instance access.
Create a user in the master library and map to the login a
Spring Bootapplication monitoring and managementSpring Boot monitoring Core is spring-boot-starter-actuator dependency, after increasing the dependency, spring boot will default to configure some common monitoring, such as JVM monitoring, class loading, health monitoring and so on.To monitor and manage applications, we only need to add dependencies on the Pom.xml:If you are using HTTP, you need to add the following dependencies:first, monitoring the role of the endpoint:Depending on the purpose
(CPT).
The architecture of the solution In our solution, we will cache the entity "Product type name" in the restful.cache application, and WebApplication will have the Create new product type entry and Restful.cache read the function. Conditions In addition, there are some prerequisites and some information we need to consider.
SQL instance, where Cachedb hosting must have "hemp and python Root Learning service" installed
To execute a python script in cachedb using TSQL, yo
cloud-based applications that are user-facing across the country and require good user responsiveness. If I only deployed the app to the Azure Shanghai Datacenter, the speed of user access in the north could be impacted. With azure traffic Manager, we can route the user's request to the nearest Azure datacenter, such as a user request from the north to the Beijing Data center, and a user request from the south to the Shanghai data Center.- perform upgrades and service maintenance in the event o
instance objects, such as animals (a group of animals).
HTTP: A communication protocol transmitted over a network;
Consumer (consumer, user): A client program capable of sending HTTP requests; [Carefree Child note: Here Consumer actually refers to the API caller, if the literal translation into the consumer more confusing]
Third parties Developer (third-party developers): those developers who are not members of your project project team but want to use your services;
Server: An
It is important to have multiple endpoint endpoint on a terminal.A node can have multiple endpoints, number No. 0 is an endpoint used by ZigBee device object (ZDO), and number No. 255 is used as a broadcast endpoint. What we can define ourselves is 1-240 of these endpoints. Each en
First, USB device description structure1. Logical Organizational StructureIn the logical organization of USB devices, there are 4 levels of devices, configurations, interfaces, and endpoints. A device typically has one or more configurations, and the configuration usually has one or more interfaces with 0 or more endpoints.Each USB device can contain one or more configurations, and different configurations allow the device to exhibit different combinations of functions, and the configuration con
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