During this 8 * 8 button, no matter whether it is written or referred to the procedure of others, it is found that there is a lot of basic knowledge points and programming specifications for C language, and some are their previous program habits. Ok, some is the basic knowledge is not solid, so it is concluded.
First, .h file and .C file relationship:
So far, the procedures written are some very simple programs, never think of writing .H files yourself, and don't know what. What is the use of .C files. Just recently write keyboard programs, when referring to other procedures, find a strict program written by others with a "key.h", defined in the .C file to write the function, such as Keyhit (), Keyscan ()Wait.
After finding the information, .h file is the header file, it is estimated that it means to mean. This is the need for structural design of the specification program, which can achieve the modularity of the large program, and the connection debugging of the root module can be realized.
1, .h file introduction:
In the single-chip C program design, the project is generally modularly designed according to functional modularization. Divide a project into multiple functions, and each function is placed in a C program document, called a module, the corresponding file name is the module name. A module is usually composed of two documents, one is a header file * .H, describes the data structure and function prototype in the module; the other is C file * .c, definition of data instance or object, and function algorithm accomplish.
2, .h file role
As a project design, in addition to the detailed description of the project's overall function, the detailed definition of each module is to give the header file of the module. Usually the H header files want to define the functions of each function in the module, and the requirements for input and output parameters. The specific implementation of the module is designed, programmed, and debugged by the project composition according to the H file. For confidentiality and security, the module is implemented to be available to the project other member using the accessible file OBJ, or the library library. Since there is no need to provide source program documentation, on the one hand, it can be publicly issued, to ensure the ownership of the developer; on the other hand, it can prevent someone from intentional or unintentional modification to generate non-consistency, resulting in version confusion. Therefore, the H header file is the basis for the detailed design of the project and the basis of the team's work division, and the function description of the module is tested. To reference data or algorithms within the module, just use the include the module H header file with the include.
3, the basic composition of .h file
/ * The header document driven by the keyboard * /
#ifndef _key_h_// anti-repeat reference, if it is not defined _key_h_, compile the sentence
#define _key_h_// This symbol is unique, indicating that only the reference is once, ie #i nclude, define symbols _key_h_
//////////////////////////////////////> //////// / / / / / / /
Char keyhit (void); // 否
UNSIGNED Char Keyscan (Void); // Take the key value
//////////////////////////////////////> //////// / / / / / / /
#ENDIF, read full text, original title: MCU C language programming, experience is here!
Article Source: [Micro Signal: Dianyuankaifa, WeChat public number: power research and development elite circle] Welcome to add attention! Please indicate the source of the article.
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