51 single chip microcomputer learning notes (1)

Programming environment ——KEIL Software installation

Premise ： Get ready keil 4 Installation program and corresponding registration machine

• open C51V901.exe（Keil 4 Erection sequence ）

* Click on Next

* Check I agree all the terms of···
* Click on Next

* Set the installation path , Select the installation directory according to your situation , Please click Browse Browse and select , It is recommended that the installation path do not contain Chinese , After setting the installation path, click Next

* Enter relevant information , Just type whatever you want , Click... After input Next

* Start installation , Wait for the installation to finish

* installation is complete , Click on Finish end

Activate keil 4

• Open the registration machine software KEIL_Lic.exe, The interface is as follows

* Open the newly installed from the desktop Keil 4 Software shortcut entry keil 4（ Be careful , To run in administrator mode ）

* Click on the top left corner File Menu selection Lincense Management, As shown in the figure below

• Copy CID Code to cutting board , Switch to the registration machine

* Get the registration code from the registration machine , Copy into License Management Below the interface New License ID Code in , And click the Add LIC, Software activation can be completed .
* The successful activation is shown below

* So far, the software has been installed . Next, you can learn and practice the program .

Engineering creation

• Open the installed editing environment Keil, Enter the following interface

!
* Click on the above Project Column selection New uVision Project Enter the following interface

* After selecting the project storage path , Enter project name （ Such as template）, Click save , Enter the following interface

* choice Atmel And select AT89C51 Click on OK And select no in the subsequent pop-up window , As shown below

* Click to create a new file in the upper left corner as shown below

* Click the save button , Select the newly created project path , Name it led.c And save

• Click the following button , Enter the engineering document management interface

* Click on Add Files, Will just set up led.c Join the project , As shown below

* After adding successfully, you can view it under the project

Light up the first LED

• Keil 4 In order to C Language is the editing environment of code editing language , So its grammar is C As the standard . Edit the code as follows

#include "reg51.h" // It can also be written as #include <reg51.h>  The function of this line is to introduce 51 SCM library file  sbit LED = P2^0;   // Define SCM pins （IO）P2^0 by LED, This pin is connected with a LED Connect , And it's time to LED One section has been connected to the positive pole 

void main()        // Define the main function , The program enters from here 
{
    while (1)      // Definition while loop , Condition is 1, namely while It's been circulating 
    {
        LED = 0;   // Set up P2^0 The pin is low level , Forming loop ,LED Lighten up 
    }
}

• Click the compile button , Check the code for errors

* If the code is OK , Set up to generate hex file （ Write the file format of MCU ）, The operation is as follows

* After setting up , Recompile the side code as follows

Write the code into the MCU

• Premise Prepare to burn the software , Provided by MCU developers , The following takes Puzhong technology SCM as an example

thus , congratulations , Lit up the first LED, Opened their own SCM life