Quick tips, teach you how to use Keil C51 software in three minutes

The KEIL C51 standard C compiler provides a C language environment for software development of 8051 microcontrollers. However, many beginners whose interface is in English are confused after reading many tutorials. This site has specially produced a relatively simple tutorial. It can embed assembly language and retain the efficient and fast characteristics of assembly code. The functions of the KEIL C51 compiler are constantly enhanced, allowing you to get closer to the CPU itself and other derivatives, and its efficiency has reached a very high level. C51 has been fully integrated into uVision2's integrated development environment, which includes: compiler, assembler, real-time operating system, project manager, and debugger. uVision2 IDE provides them with a single and flexible development environment.

Keil C51 software is one of the many excellent software for microcontroller application development. It integrates editing, compilation and simulation. It supports assembly, PLM language and C language programming. It has a friendly interface and is easy to learn and use.

The following introduces how to use Keil C51 software

After entering Keil C51, the screen is as shown below. The editing window will appear after a few seconds

Screen when starting Keil C51

Enter the editing interface of Keil C51

The best way to debug simple programs, learn a programming language, and learn a certain programming software is to directly operate and practice. The following will guide you through simple programming and debugging to learn the basic usage of Keil C51 software and basic debugging skills.

1) Create a new project, click the Project menu, and select the New Project option in the pop-up drop-down menu.

2) Then select the path you want to save, enter the name of the project file, for example, save it to the C51 directory, the name of the project file is C51 as shown in the figure below, and then click Save.

3) A dialog box will pop up, asking you to select the model of the microcontroller. You can choose according to the microcontroller you are using. Keil c51 supports almost all 51-core microcontrollers. I will use the Atmel one that is used more often. 89C51 will be used to illustrate, as shown in the figure below. After selecting 89C51, the right column will provide a basic description of this microcontroller, and then click OK.

4) After completing the previous step, the screen will look like the picture below

So far, we have not written a program, let's start writing our first program. 5) In the picture below, click the "File" menu, and then click the "New" option in the drop-down menu

After creating a new file, the screen is as shown below

At this time, the cursor flashes in the editing window, and you can type the user's application. However, the author recommends saving the blank file first, clicking "File" on the menu, and selecting the "Save As" option in the drop-down menu. , the screen is as shown below. In the edit box on the right side of the "File Name" column, type the file name you want to use. At the same time, you must type the correct extension. Note that if the program is written in C language, the extension must be (.c); if the program is written in assembly language, the extension must be (.asm). Then, click the "Save" button.

6) After returning to the editing interface, click the "+" sign in front of "Target 1", then right-click on "Source Group 1", the following menu will pop up

Then click "Add File to Group 'Source Group 1'" The screen is as shown below

Select Test.c and click "Add" as shown below

Did you notice that there is an extra subkey "Text1.c" in the "Source Group 1" folder? The number of subkeys is the same as the number of added source programs.

7) Now, please enter the following C language source program:

#include "reg52.h" //Include file #include "stdio.h" void main (void) //Main function { SCON=0x52; TMOD=0x20; TH1=0xf3; TR1=1; //This line and above 3 lines are necessary for the PRINTF function printf ("Hello I am KEIL."); //Print program execution information

printf("I will be your friend.");

while(1);

}

When entering the above program, readers have already seen the benefit of saving files to be edited in advance, that is, Keil c51 will automatically identify keywords and prompt the user to pay attention in different colors. This will reduce the user's mistakes and is beneficial to Improve programming efficiency. After the program input is completed, as shown in the figure below

8) In the picture above, click the "Project" menu, and then click the "Built Target" option in the drop-down menu (or use the shortcut key F7). After the compilation is successful, click the "Project" menu again, and in the drop-down menu Click "Start/Stop Debug Session" (or use the shortcut key Ctrl+F5), the screen is as shown below

9) Debugging the program: In the picture above, click the "Debug" menu, click the "Go" option in the drop-down menu, (or use the shortcut key F5), then click the "Debug" menu, and click "Go" in the drop-down menu. Click the "Stop Running" option (or use the shortcut key Esc); then click the "View" menu, and then click the "Serial Windows #1" option in the drop-down menu, you can see the results after the program is run, the results are as follows As shown in the picture

At this point, we have completed the entire process of a complete project on Keil C51. But this is just a pure software development process. How to use the program downloader to see the results of the program running?

10) Click the "Project" menu, and then click " " in the drop-down menu. In the picture below, click the "Create HEX File" option in "Output" to compile the program to generate HEX code for use by the downloader software. . Download the program to the AT89S51 microcontroller.