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This is a comment to a previously asked question related to the EW7811U WiFi adapter (the topic was closed so I cannot answer directly). I have the same Edimax EW7811U adapter and here is how I got it working with Red Pitaya and my WPA2-protected 802.11n network.

First shut off the Red Pitaya, remove the memory card and connect it to a PC (I used the adapter that came with the memory card and inserted into the memory card slot in my laptop).

Edit the file /etc/network/wpa_supplicant.conf and insert the ssid and psk strings: 

# WPA2 configuration example
network={
   ssid="ssid-string"
   psk="password-string"
   proto=WPA2
   key_mgmt=WPA-PSK
   pairwise=CCMP
   group=CCMP
   auth_alg=OPEN
}

Save the file and put the memory card back into Red Pitaya and restart.

In my console I can see that the wlan0 interface is initialized and that the DHCP client gets an IP address:

++ Bringing up wlan0
Successfully initialized wpa_supplicant
rfkill: Cannot open RFKILL control device
ioctl[SIOCSIWAP]: Operation not permitted
udhcpc (v1.20.1) started
Sending discover...
Sending discover...
Sending discover...
Sending select for 192.168.11.115...
Lease of 192.168.11.115 obtained, lease time 43200

You can check the interface status with iwconfig:

redpitaya> iwconfig
wlan0     IEEE 802.11bgn  ESSID:"my-ssid"  Nickname:"<WIFI@REALTEK>"
      Mode:Managed  Frequency:2.412 GHz  Access Point: 20:C9:D0:1D:AB:CD   
      Bit Rate:150 Mb/s   Sensitivity:0/0  
      Retry:off   RTS thr:off   Fragment thr:off
      Encryption key:****-****-****-****-****-****-****-****   Security mode:open
      Power Management:off
      Link Quality=100/100  Signal level=83/100  Noise level=0/100
      Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
      Tx excessive retries:0  Invalid misc:0   Missed beacon:0
user3403098
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  • One additional note: you can actually edit the files directly by making the file system writable with the 'rw' command (use 'ro' to make it read-only after edits). – user3403098 Mar 18 '14 at 05:23
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    You can skip all this given the recent updates and bug fixes for the Red Pitaya. Just follow the quick-start instructions exactly, choosing the "connect wirelessly" option. Note that you must restart the Red Pitaya twice like it says. – herrtim Jul 01 '16 at 13:20
  • I’m voting to close this question because it is an answer to a question posted elsewhere and not a question in itself. In addition, it is off topic here which is why the referenced question was closed. [What topics can I ask about here?](https://stackoverflow.com/help/on-topic) – Rob Jul 31 '21 at 09:39

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