Setting Up WiFi Print

WiFi in the Default Linux Configuration

Your i.MX 8M Mini kit arrives with the Linux image ready for WiFi operation. You will have to configure your specific unit to connect to a local WiFi access point.

Setting Up WiFi Antenna

The i.MX 8M Mini kit arrives with the WiFi antenna. Make sure it is securely connected to the antenna connector on the System-On-Module and is placed into a position that allows for maximum connectivity with your WiFi Access Point.

Using WiFi in Linux

When Linux boots, the WiFi interface is enabled and configured in the default image installed to the kit. Step through the following procedure to configure WiFi for your local environment and then use it to access the Internet:

  1. On the i.MX 8M Mini, issue the following command from the Linux shell:
  2. root@imx8mm-lpddr4:~# systemctl stop wpa_supplicant
    root@imx8mm-lpddr4:~# wpa_supplicant -i wlan0 -c \
    /etc/wpa_supplicant.conf -B
    Successfully initialized wpa_supplicant

  3. Validate that the i.MX 8M Mini is able to detect WiFi Access Points in the vicinity:
  4. root@imx8mm-lpddr4:~# wpa_cli -i wlan0 scan OK root@imx8mm-lpddr4:~# wpa_cli -i wlan0 scan_results bssid / frequency / signal level / flags / ssid ec:43:f6:02:75:54 2437 -75 [WPA2-PSK-CCMP][ESS] Maxim c0:25:e9:05:55:1e 2412 -83 [WPA2-PSK-CCMP][WPS][ESS] Hone-120 ec:43:f6:e1:4a:d8 2422 -24 [WPA2-PSK-CCMP][WPS][ESS] Tik 16:2d:27:5e:54:d4 2432 -72 [WPA2-PSK-CCMP][WPS][ESS][P2P] DIRECT-YQ-BRAVIA ea:28:5d:7b:5a:f8 2432 -78 [WPA2-PSK-CCMP][WPS][ESS] ELDAR ec:43:f6:e1:4a:da 5180 -82 [WPA2-PSK-CCMP][WPS][ESS] Tik5 14:dd:a9:f0:bf:08 2437 -87 [WPA2-PSK-CCMP][WPS][ESS] Gnomiki c8:3a:35:18:7b:21 2452 -87 [WPA-PSK-CCMP][WPA2-PSK-CCMP][WPS][ESS]Dom 08:60:6e:e1:66:0c 2437 -87 [WPA2-PSK-CCMP][WPS][ESS] Ioanna 3c:15:c2:f4:05:66 2462 -88 [WPA2-PSK-CCMP][ESS] Air Network bc:ee:7b:e4:24:58 2457 -85 [WPA2-PSK-CCMP][ESS] b0:6e:bf:d8:a7:78 2467 -87 [WPA2-PSK-CCMP][WPS][ESS] Nastya1

  5. Connect to the Internet over WiFi:

    root@imx8mm-lpddr4:~# wpa_cli -i wlan0 add_network root@imx8mm-lpddr4:~# wpa_cli -i wlan0 set_network 1 \ ssid '"name-of-access-point"' OK root@imx8mm-lpddr4:~# wpa_cli -i wlan0 set_network 1 \ psk '"password-to-access-point"' OK root@imx8mm-lpddr4:~# wpa_cli -i wlan0 enable_network 1 OK [ 284.555912] wlan0: authenticate with ec:43:f6:e1:4a:d8 [ 284.627134] wlan0: send auth to ec:43:f6:e1:4a:d8 (try 1/3) [ 284.634605] wlan0: authenticated [ 284.639897] wlan0: associate with ec:43:f6:e1:4a:d8 (try 1/3) [ 284.649323] wlan0: RX AssocResp from ec:43:f6:e1:4a:d8 (capab=0x411 status=0 aid=1) [ 284.660116] wlan0: associated root@imx8mm-lpddr4:~# udhcpc -i wlan0 Sending discover... Sending select for Lease of obtained, lease time 25200 /etc/udhcpc.d/50default: Adding DNS /etc/udhcpc.d/50default: Adding DNS

  6. Validate the connection by pinging a public host:

    root@imx8mm-lpddr4:~# ping -c 3 PING ( 56(84) bytes of data. 64 bytes from ( icmp_seq=1 ttl=47 time=18.5 ms 64 bytes from ( icmp_seq=2 ttl=47 time=20.7 ms 64 bytes from ( icmp_seq=3 ttl=47 time=20.9 ms --- ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2004ms rtt min/avg/max/mdev = 18.593/20.102/20.930/1.075 ms

Determining WiFi Signal Strength

Use the following Linux commands to scan for available WiFi access points and determine signal strength:

root@imx8mm-lpddr4:~# ifconfig wlan0 up root@imx8mm-lpddr4:~# iw wlan0 scan ... BSS 60:ce:86:9f:3a:01(on wlan0) last seen: 122.843s [boottime] TSF: 1084189075325 usec (12d, 13:09:49) freq: 5200 beacon interval: 29 TUs capability: ESS Privacy SpectrumMgmt ShortSlotTime (0x0511) signal: -71.00 dBm last seen: 0 ms ago SSID: MGTS_GPON5_70C6 Supported rates: 6.0* 9.0 12.0 18.0 24.0 36.0 48.0 54.0