51 single Knowledge Overview

1) H file role 1 Convenient development: Contains common constants, structures, type definitions, functions, variables required for files; 2 Provide an interface: For a package, you can provide an interface to the outside world (for example: stdio.h). 2) What should I have in the H file? Constants, structures, type definitions, functions, variables declaration. 3) Haf files should not have anything Variable definitions, function definitions. 4) EXTERN problem EXTERN is required for variables; For functions, it is not necessary because the default status of the function is extern. If a function is changed to only in the file, add Static. 5) Include contains problems Although the decision and type definition can be repeated, it is recommended to compile the use conditions. #ifndef _filename_h, #define _filename_h ...... #ENDIF 6) There should be H files there. In a needed place. For example, an H file that provides an interface is only required by the 1.c file, then it is included in the 1.c file. The written programs generally have .h files and corresponding .c files, .h files are used, .c files are their function implementation. As long as the .h file is included, we have never heard of the program of #include "delay.c", and does not advocate this form. In the delay.h file: // Declaration of the function of the call #ifndef __delay_h__ #define __delay_h__ EXTERN VOID DELAYMS (Unsigned Int N); #ENDIF In the delay.c file: // Function Implementation #include // for crystal 11.0592m Void delayms (unsigned int N) { UNSIGNED INT I, J; For (j = n; j>0; j -) For (i = 112; I>0; I -); } In the main program main.c # include // In the main program contains .h file, you cannot contain .c files ...... The above method still requires that each project needs to copy the corresponding header file to the project folder, which seems to be more troublesome, and another method is to put a good header file in one. In the folder, then copy this folder to ..keilc51inc, if you need to use a header file, if you use Keil's head file, there is a sentence in the main function mani (). You can use the functions in main (). Read all text, original title: 51 MCU C.c file and .h file Article Source: [Micro Signal: Changxuemcu, WeChat Public Number: Study Mechanical Machine] Welcome to add attention! Please indicate the source of the article.

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