developing-the-first-example-program-running-on-hi3861.md

# Developing the First Example Program Running on Hi3861<a name="EN-US_TOPIC_0000001053302600"></a>

-   [Building](#section191121332125319)
-   [Burning Images](#section1610612214150)
-   [Connecting WLAN Module to the Internet](#section168257461059)

This example shows how to connect the WLAN module to the gateway using attention \(AT\) commands.

## Building<a name="section191121332125319"></a>

This section describes how to perform the WLAN module building on a Linux server.

If the Linux environment is installed using Docker, perform the building by referring to  [Using Docker to Prepare the Build Environment](../get-code/acquiring-tools.md). If the Linux environment is installed using a software package, perform the following steps:

1.  Open the HUAWEI DevEco Device Tool and choose  **View**  \>  **Terminal**.

    **Figure  1**  Starting the IDE terminal tool<a name="fig1975813338510"></a>  
    

    ![](figures/1.png)

    On the  **TERMINAL**  panel, run the ssh command, for example,  **ssh** **_user_@_ipaddr_**, to connect to the Linux server.

    **Figure  2**  TERMINAL panel<a name="fig91165301546"></a>  
    

    ![](figures/2.png)

2.  Go to the root directory of the code, run the  **hb set**  and  **.**  commands on the  **TERMINAL**  panel, and select the  **wifiiot\_hispark\_pegasus**  version.

    **Figure  3**  Selecting the target build version<a name="fig17727115215612"></a>  
    

    ![](figures/3.png)

3.  Run the  **hb build**  command to start building.

    **Figure  4**  Running commands on the TERMINAL panel<a name="fig5493164414573"></a>  
    

    ![](figures/4.png)

4.  Check whether the building is successful. If yes,  **wifiiot\_hispark\_pegasus build success**  will be displayed, as shown in the following figure.

    **Figure  5**  Successful building<a name="fig1262101218463"></a>  
    

    ![](figures/5.png)

5.  Check whether the following files are generated in the  **./out/wifiiot/**  directory.

    ```
    ls -l out/hispark_pegasus/wifiiot_hispark_pegasus/
    ```

    **Figure  6**  Directory for storing the generated files<a name="fig38521346164618"></a>  
    

    ![](figures/3-0.png)


## Burning Images<a name="section1610612214150"></a>

You can use the DevEco tool to perform the image burning of the Hi3861 WLAN module. For details about how to use the tool, see  [HUAWEI DevEco Device Tool User Guide](https://device.harmonyos.com/en/docs/ide/user-guides/service_introduction-0000001050166905).

1.  Connect the PC and the target development board through the USB port. For details, please refer to  [Introduction to the Hi3861 Development Board](https://device.harmonyos.com/en/docs/start/introduce/oem_wifi_start_des-0000001050168548).
2.  <a name="en-us_topic_0000001056563976_li848662117291"></a>Open Device Manager, then check and record the serial port number corresponding to the development board.

    >![](public_sys-resources/icon-note.gif) **NOTE:** 
    >If the serial port number is not displayed correctly, follow the steps described in  [Installing the Serial Port Driver on the Hi3861 Series Development Boards](https://device.harmonyos.com/cn/docs/ide/user-guides/hi3861-drivers-0000001058153433).

    ![](figures/en-us_image_0000001073388838.png)

3.  Open DevEco Device Tool and go to  **Projects**  \>  **Settings**.

    ![](figures/en-us_image_0000001078404538.png)

4.  On the  **hi3861**  tab page, set the programming options.

    -   **upload\_port**: Select the serial port number obtained in step  [2](#en-us_topic_0000001056563976_li848662117291).
    -   **upload\_protocol**: Select the programming protocol  **burn-serial**.
    -   **upload\_partitions**: Select the file to be programmed.  **hi3861\_app**  is selected by default.

    ![](figures/en-us_image_0000001078244328.png)

5.  Modify the settings of the  **hi3861\_app**  file. In general cases, you can leave the fields at their default settings. To change the default settings, select the target item in the  **New Option**  field first.

    ![](figures/en-us_image_0000001120802173.png)

6.  When you finish modifying, click  **Save**  in the upper right corner.

    ![](figures/en-us_image_0000001078313582.png)

7.  Open the project file. In the DevEco Device Tool window, go to  **PROJECT TASKS**  \>  **env:hi3861**  \>  **Upload**  to start programming.

    ![](figures/en-us_image_0000001120802383.png)

8.  When the following information is displayed, press the RST button on the development board to restart it.

    ![](figures/en-us_image_0000001074285712.png)

9.  Start programming. When the following message is displayed, it indicates that the programming is successful.

    ![](figures/en-us_image_0000001074445364.png)


## Connecting WLAN Module to the Internet<a name="section168257461059"></a>

After completing version building and burning, do as follows to connect the WLAN module to the Internet using AT commands.

1.  Click the icon of  **DevEco: Serial Monitor**  at the bottom of DevEco Studio to keep the connection between the Windows workstation and the WLAN module.

    **Figure  7**  Opening the DevEco serial port<a name="fig12489182991119"></a>  
    

    ![](figures/5-1.png)

2.  Reset the WLAN module. The message  **ready to OS start**  is displayed on the  **TERMINAL**  panel, indicating that the WLAN module is started successfully.

    **Figure  8**  Successful resetting of the WLAN module <a name="fig496084516332"></a>  
    

    ![](figures/6.png)

3.  Run the following AT commands in sequence via the DevEco serial port terminal to start the STA mode, connect to the specified AP, and enable Dynamic Host Configuration Protocol \(DHCP\).

    ```
    AT+STARTSTA                             # Start the STA mode.
    AT+SCAN                                 # Scan for available APs.
    AT+SCANRESULT                           # Display the scanning result.
    AT+CONN="SSID",,2,"PASSWORD"            # Connect to the specified AP. (SSID and PASSWORD represent the name and password of the hotspot to be connected, respectively.)
    AT+STASTAT                              # View the connection result.
    AT+DHCP=wlan0,1                         # Request the IP address of wlan0 from the AP using DHCP.
    ```

4.  Check whether the WLAN module is properly connected to the gateway, as shown in the following figure.

    ```
    AT+IFCFG                                # View the IP address assigned to an interface of the module.
    AT+PING=X.X.X.X                         # Check the connectivity between the module and the gateway. Replace X.X.X.X with the actual gateway address.
    ```

    **Figure  9**  Successful networking of the WLAN module<a name="fig1166371318339"></a>  
    

    ![](figures/截图.png)