1. Mx6ul core module serial WiFi test (VIII)

The following is already in Iot-6ULX/EVB-6ULX The verification on the platform passed ,Iot-6ULX/EVB-6ULX Introduce the following ：

 

7. WIFI test  

IoT-6ULx On the core board WIFI+BT modular AP6214A, Support WIFI And Bluetooth . The backplane is equipped with an antenna interface , It can be used to connect the antenna , Enhance wireless signal . test WIFI Before function , Connect to the development board WIFI Antenna of the module .

WIFI Schematic diagram of antenna interface

WIFI The driver of the module is not integrated into linux In the kernel image , stay linux Only when the device is detected during startup can the driver be loaded . If the driver is not loaded after the system starts , You need to execute instructions to pass modprobe Install the module driver .

[email protected] ~# modprobe brcmfmac                 // adopt modprobe Installation driver

Use ifconfig Command to display the network .

[email protected] ~# ifconfig                            // View network information

                                                                        see WIFI Internet Information  

wlan0 yes WIFI Network nodes , The node can be queried in the network configuration information , Indicates that the driver has been loaded correctly . At this time, the network does not get IP Information , Not yet available , The network needs to be configured and connected .

7.1 Network connection configuration

Configure the wireless network , Need to use wpa_supplicant Tools .wpa_supplicant yes linux A very powerful wireless network card management program under the system , It is WPA（WIFI Network security access point ） Application layer authentication client , Be responsible for completing the login related to authentication 、 Encryption, etc .

First , We need to make a configuration file of the relevant information of the wireless network to be connected , Put it in the file system , So that when you connect to the network, you can read the information of the network . In our supporting system , A configuration file has been made wpa_supplicant.conf, Put it in etc Under the table of contents , Execute the following instructions to view the configuration information ：

[email protected] ~# cat /etc/wpa_supplicant.conf               see etc In the catalog wpa_supplicant.conf file

                                                      View the wireless network configuration file

In the display information of the terminal ,network={ } The contents in brackets are the specific configuration information of the wireless network . The following is a brief description of the configuration parameters ：

• ssid="artcor", Name of wireless network .
• psk="82523090", Encrypted wireless network password .
• proto=WPA RSN, Network protocol .
• key_mgmt=WPA-PSK, Authentication key management protocol .
• group=CCMP, Group key encryption .
• pairwise=CCMP, Encrypt the key .

The user is testing WIFI In the process , The wireless network name in the configuration file （ssid） And network password （psk） Change the name and password of the wireless network you want to connect to , Other parameters need not be modified .

Execute the following instructions to enter the editing interface of the configuration file :

[email protected] ~# vi /etc/wpa_supplicant.conf                   // edit etc In the catalog wpa_supplicant.conf file

                                                      Get into vi Editor command mode

Input vi After the instruction , Automatically enter to vi The command mode of the editor . here , Click on the keyboard “i” key , Switch to edit mode , You can start to modify the contents of the file .

                                                          Get into vi Editor editing mode

After the configuration information is modified , Click on the keyboard “Esc” key , Switch to command mode , Input “:wq”, You can save the modification information and exit vi Editor . And then you can go through cat Command to check whether the file information is modified correctly ：

[email protected] ~# cat /etc/wpa_supplicant.conf                 // see etc In the catalog wpa_supplicant.conf file

After the network configuration file is modified , adopt wpa_supplicant The tool connects to the wireless network in the configuration file , Execute the following instructions ：

[email protected] ~# wpa_supplicant -i wlan0 -c /etc/wpa_supplicant.conf -B

among “-i” Represents the specified network port ,“-c” The representative executes according to the configuration file ,“-B” Represents the execution of processes in the background .

                                                              Connect to a wireless network

According to the terminal information ,wlan0 Connected to the network . Use ifconfig Command to see wlan0 Whether it has been correctly obtained IP. If wlan0 Failed to get IP, adopt udhcpc Command acquisition ：

[email protected] ~# ifconfig                            // View network information

[email protected] ~# udhcpc -i wlan0                    // obtain wlan0 Of IP

wlan0 Get IP in the future , Then you can start the network test .

7.2 Network connectivity test

adopt ping Command to test the connectivity of the network .

ping The host connected to the development board , In this test , Our mainframe IP by 192.168.0.6. During the test, the user will IP Replace it with your own host IP that will do . The test process is as follows “Ctrl+c” End ping Instructions .

[email protected] ~# ping 192.168.0.6 -I wlan0         // use wlan0 ping host 192.168.0.6

                                                              wlan0 Connectivity testing

ping After the test , View terminal information , There is no packet loss , It shows that the network connectivity is good .

ping Baidu , Test whether you can surf the Internet . The test process is as follows “Ctrl+c” End ping Instructions .

[email protected] ~# ping www.baidu.com -I wlan0               // use wlan0 ping Baidu

 WIFI Online testing

ping After the test , View terminal information , There is no packet loss , It shows that the network connectivity is good .

7.3 TCP/UDP Bandwidth test

Bandwidth test use iperf3 Tools . About iperf3 Please refer to the chapter for the installation and use information of the tool 4.6.2 The content of , No more details here .

Open on the host side Powershell window ：

                                                             Powershell Window interface  

stay Powershell The window executes the following instructions , open iperf3 Tools ：

PS E:\iperf-3.1.3-win64> .\iperf3 -s  

                                                                          open iperf3 Tools  

here , The host side acts as a server , Development board as client , You can test the network bandwidth .

Start iperf3 Before testing , To avoid interference , Turn off irrelevant network devices first , Keep only the equipment to be tested . Now we are testing wlan0, If eth0 There is a connection , Just turn it off .

[email protected] ~# ifconfig eth0 down                  // close eth0,down Means closing

After shutting down the irrelevant network , Execute the following instructions , test TCP bandwidth , This test host IP by 192.168.0.6：

[email protected] ~# iperf3 -c 192.168.0.6 -t 10 -4     // test TCP bandwidth , Duration 10s,IPv4 standard

During the test , HyperTerminal and Powershell The window will print relevant information , As shown in the figure below ：

                                                    test TCP Bandwidth terminal display

                                                      test TCP bandwidth Powershell Show  

TCP The default is to test with the maximum bandwidth ,WIFI Of TCP Bandwidth is related to network performance .

Execute the following instructions , test UDP bandwidth , This test host IP by 192.168.0.6：

[email protected] ~# iperf3 -c 192.168.0.6 -u -t 10 -4            // test UDP bandwidth , Duration 10s,IPv4 standard

During the test , HyperTerminal and Powershell The window will print relevant information , As shown in the figure below ：

                                                    test UDP Bandwidth terminal display

                                                    test UDP bandwidth Powershell Show

UDP Default bandwidth 1Mbit/sec, The closer the test value is to the theoretical value, the better the test result .