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I. the PWM output pin of stm32 is the reuse function of the I/O port. Ii. T2 ~ T5 these 4 Universal timers can output 4-way PWM--CH1 ~ . 3. We will use tim3's PWM output as an example to explain the text (other similar ), finally, we will provide the C code output by the two PWM methods of tim3 and CH2 (the test has been successful on stm32f103rbt6, so you can use it with confidence !). 4. The formula for calculating the PWM frequency and duty cycle i

Presumably we all remember a few years ago, to apply for the installation of telephone lines, for electricity charges toiled; today, the installation of telephone no longer need to wait, in front of the bank's operating counter can be long-distance phone calls and city charges together. These are just a few of the changes in the communications environment that we can feel firsthand, and these changes depend on the introduction of management techniques in the telephone switching network. In the

　　Single Responsibility principle (SRP): In the case of a class, there should be only one cause for it to change. 　　If a class takes on too much responsibility, it is tantamount to coupling these responsibilities, and a change in responsibility may be less likely to inhibit the ability of the class to perform other duties. This coupling is a fragile design, and when changed, the design can cause unexpected damage.　　Software design really has to do a lot of things, is to discover responsibilities

Problem:a class, only one causes it to change. There should be only one duty. Each responsibility is an axis of change, and if a class has more than one responsibility, these responsibilities are coupled together. This can lead to fragile designs. When a duty changes, other responsibilities may be affected. In addition, multiple responsibilities are coupled together, which can affect reusability . For exam

Battlefield 3's image effects and character rendering are not as good as the Call of Duty 8. However, the plot of Battlefield 3 is very good, while the plot design of Call of Duty is based on several characters, and the plot is very compact. The island crisis is not a good story, and I don't like aliens either. The city in this story is an isolated island, an isolated city in the new Batman dark rise.

= Cheekbreathe ()): super (Aquatic,self). __init__ (Name,breathep) c = Terrestrial (' tabby cat ') c.performbreathe () fish = Aquatic (' Mermaid ') fish.performbreathe ()We find that the second way is to implement the class of a behavior in the form of an interface, and you might think that the second method has a significantly longer code implementation and why I use the second way.In today's example, there is no doubt that the first method is simple, so let's take a look at the purpose

Last week on duty, encountering such a customer problem, the table structure is simplified as follows: CREATE table ' AA ' (' C1 ' int (ten) unsigned not NULL auto_increment,' C2 ' int (one) DEFAULT NULL,' C3 ' Int (one) DEFAULT ' 0 ',' C4 ' int (one) DEFAULT NULL,PRIMARY KEY (' C1 ')Engine=innodb DEFAULT Charset=utf8 When using the following syntax, how can I insert two records of C2 = 1007 and C3 = 1? Insert into a AA (C2,C4) Select 1007, 8 from dua

Separation of concerns (separation of CONCERNS,SOC) is the ability to identify, encapsulate, and manipulate concerns by "identifying, encapsulating, and manipulating" the software components associated with only "specific concepts, goals, and concerns". is a principle of dealing with complexity. Because the combination of concerns leads to a significant increase in complexity, it is possible to separate the different points of concern and deal with each other as a principle of dealing with compl

In the commonly used three-tier architecture, the data access layer is usually used to modify or query data, and general modifications and queries use the same entity. There may be no problems with some simple systems of business logic, but as the system logic becomes more complex and users increase, there are some performance problems with this design. Although some of the design of read-write separation can be done on db, there are still some problems in the business if they are mixed together

) { this. Handler.handler (); }}}Pass the flower classmate C: Public class extends Handler { @Override publicvoid Handler () { System.out.println (" C Performance Programme "); if (thisnull) { this. Handler.handler (); }}}Test class: Public classTest { Public Static voidMain (string[] args) {Handler Ahandler=NewAhandler (); Handler Bhandler=NewBhandler (); Handler CHandler=NewCHandler (); System.out.println ("-------a==>b==>c--------");

mechanisms: Public Static String classify (collection c) { returninstanceof Set? "Set" : instanceof List? "List": Unknown Collection ";}The ObjectOutputStream class, for each base type, and several reference types, has a different name for the write method, such as Writeint,writeboolean,writelong. This is a good practice.After the release of Java 1.5, there are some problems caused by automatic boxing: Public classSetlist { Public Static voidMain (string[] args) {SetNewTreeset();

and help Zhongshan Buffalo friend to do Labor, "forced" to sister paper to do Labor, help her to shoot Zhongshan Buffalo south of the outer wall of clothing, said what my red rice note phone is clear enough, said her iphone4s photographed too garbage, Khan, I thought, Do you reverse the argument, I am, of course, this can not be said, said the business needs of the company, it seems to be the idea of her to "overtime".Always contrasted with the opposite of the Four Seasons Green Clothing city, a

Idea: can be greedy, can also shortest way.Greedy writing: Because in the guarantee of legal premise, we choose the interval must be the right end point as far as possible, so we choose a legitimate and right end of the next interval is good (if there is no legitimate output-1 can). Time complexity O (NLOGN) (sort is nlogn, greed is O (n)).#include The shortest way to do this: interval [l,r] means you can go from l-1 to R, then we will l-1 a weight of 1 to the edge to r, and then because the in

C ++ learning heavy-duty operator 1, heavy operator In addition to overload functions, C ++ Allows defining existing operators so that they can be used like processing data through Operator overloading. Code first1 # include An error will be prompted during compilation: ------------------ Configuration: demo1-Win32 Debug --------------------Compiling...Demo. cppE: \ CCDEMO \ demo1 \ demo. cpp (19): error C2676: binary '++ ': 'class num' does not defin

The script for automatically recording the switch-on time at work and OFF-duty @ echo off www.2cto.com set a = % date :~ 0, 10% set B = % time :~ % If "% 1" = "s" goto sif "% 1" = "e" goto eexit: secho -------------------------------------------> E: \ shangban.txt echo Logon Time: % a % B %> E: \ shangban.txt www.2cto.com exit: eecho exit Time: % a % B %> E: \ shangban.txt echo -----------------------------------------> E: \ shangban.txt exit: echo lo

Today, as smartphones are moving towards the light and thin trend, we have developed a heavy-duty smart phone with the following features. 1. Configure an ultra-high-capacity battery The endurance is greatly enhanced, saving users' daily charging troubles. 2. configure a professional camera The zoom range is significantly expanded, and the imaging quality is greatly improved. 3. configure more professional audio chips and external speakers

The single responsibility principle (Srp:single responsibility principle), also known as the single function principle, stipulates that a class should have only one reason for change.If a class takes on too much responsibility, it is tantamount to coupling those responsibilities together. A change in one's responsibilities may weaken or inhibit the ability of this class to perform other duties. This coupling leads to a fragile design that, when changed, is subjected to unexpected damage. If you

Question: Pedro bought two different brands of chocolate. He found some small boxes. He was going to separate the chocolate and put it in a small box for his friends; In order not to be found by friends to save money, only the same brand of chocolate can be placed in each small box. Analysis: DP, 01 backpack. Here, each small box serves as an item, and the first chocolate serves as a box, recording the precursor (PATH) of each box ); Then, enumerate all the states of the first chocolate, and det

The so-called overload is to give a new meaning. Function Overloading is to assign a new meaning to an existing function to implement new functions.Operators can also be overloaded.Operator Overloading is to give multiple meanings to existing operators.NecessityIn C ++, the pre-defined operator can only operate on basic data types, but does not apply to user-defined types (such as classes)(1) c ++ does not allow users to define new operators themselves. It can only overload existing C ++ operato

7. Unit III Task Four training: Method SetID can set a value for a class's properties: ID (ID number), when given a value of length of 18 o'clock, assigned to the ID, the duty length is not 18 o'clock, throw illegalargumentexception exception. To capture and handle exceptions in the main method, write programs to achieve these functions. The public class Test { private String id;//ID number should be the length of public void SetId (String id)