WiFi Configuration and Usage¶

The following Wiki pages were previously created for other Critical Link products the integrated WiFi 802.11 functionality. We highly recommend you take a look through them for information about using WiFi in general.

L138 WiFi Wiki
TiWi-R2 WiFi/BT Expansion Board
335x Compatible WiFi Devices

Short guide on WiFi usage¶

1. Make an entry at the top of the /etc/wpa_supplicant.conf file for your WiFi network based on the examples provided in that document or our L138 WiFi wiki
   

   # Example of WPA network
   network={
           ssid="your_ssid" 
           proto=WPA
           key_mgmt=WPA-PSK
           pairwise=TKIP
           group=TKIP
           psk="ascii_passphrase" 
   }
   

2. Bring up the WLAN0 interface (WiFi 802.11 B/G/N)
   

   ifup wlan0
   

3. Output similar to the following should be seen
   

   root@mitysom-335x ~ $ ifup wlan0
   [  655.651519] wl12xx_set_power omap_hsmmc.1 s=0 on=1 vdd=21
   [  656.164672] wl1271: firmware booted (Rev 6.3.0.0.77)
   [  656.231445] wl1271: down
   [  656.241333] wl12xx_set_power omap_hsmmc.1 s=0 on=0 vdd=0
   [  657.281524] wl12xx_set_power omap_hsmmc.1 s=0 on=1 vdd=21
   [  657.794738] wl1271: firmware booted (Rev 6.3.0.0.77)
   [  659.861572] wl1271: Association completed.
   udhcpc (v1.13.2) started
   Sending discover...
   Sending select for 10.0.102.191...
   Lease of 10.0.102.191 obtained, lease time 7200
   adding dns 10.0.0.1
   

4. Issuing the "iwconfig" command should show the current wireless connection settings/status
   

   root@mitysom-335x ~ $ iwconfig
   lo        no wireless extensions.
   
   wlan0     IEEE 802.11abgn  ESSID:"CriticalLink" 
             Mode:Managed  Frequency:2.412 GHz  Access Point: C6:9F:DB:E9:32:BA
             Bit Rate=36 Mb/s   Tx-Power=20 dBm
             Retry  long limit:7   RTS thr:off   Fragment thr:off
             Encryption key:off
             Power Management:on
             Link Quality=48/70  Signal level=-62 dBm
             Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
             Tx excessive retries:0  Invalid misc:2   Missed beacon:0
   
   eth0      no wireless extensions.
   
   can0      no wireless extensions.
   

Scanning for networks without configuring a connection/AP¶

This method allows you to confirm that the WiFi radio is functioning properly. It does not require a configured connection but will list all access points that the WiFi radio can detect and print their capabilities.

1. Bring up the WLAN0 interface (WiFi 802.11 B/G/N)
   

   root@mitysom-335x ~ $ ifup wlan0
   

1. Scan for networks in the area
   

   root@mitysom-335x ~ $ iwlist wlan0 scan
   wlan0     Scan completed :
             Cell 01 - Address: C6:9F:DB:E9:32:BA
                       Channel:1
                       Frequency:2.412 GHz (Channel 1)
                       Quality=50/70  Signal level=-60 dBm
                       Encryption key:on
                       ESSID:"CriticalLink" 
                       Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                                 9 Mb/s; 12 Mb/s; 18 Mb/s
                       Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                       Mode:Master
                       Extra:tsf=0000003dcb9e65a6
                       Extra: Last beacon: 1750ms ago
                       IE: Unknown: 000C437269746963616C4C696E6B
                       IE: Unknown: 010882848B960C121824
                       IE: Unknown: 030101
                       IE: Unknown: 2A0100
                       IE: Unknown: 2F0100
                       IE: IEEE 802.11i/WPA2 Version 1
                           Group Cipher : TKIP
                           Pairwise Ciphers (2) : CCMP TKIP
                           Authentication Suites (1) : PSK
                       IE: Unknown: 32043048606C
                       IE: Unknown: 2D1ACC111BFFFF000000000000000000000000000000000000000000
                       IE: Unknown: 3D1601001F00000000000000000000000000000000000000
                       IE: WPA Version 1
                           Group Cipher : TKIP
                           Pairwise Ciphers (2) : CCMP TKIP
                           Authentication Suites (1) : PSK
                       IE: Unknown: DD180050F202010107000364000027A4000041435E0061322F00
                       IE: Unknown: DD0900037F01010000FF7F
                       IE: Unknown: DD0A00037F04010002004000
                       IE: Unknown: DD1E00904C33CC111BFFFF000000000000000000000000000000000000000000
                       IE: Unknown: DD1A00904C3401001F00000000000000000000000000000000000000
                       IE: Unknown: DD0C00156D0001000000E5020014