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RPi Peripherals

Revision as of 10:38, 17 April 2012 by Linker3000 (Talk | contribs)

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Setup examples for various peripherals

Wireless: TP-Link TL-WN722N USB wireless adaptor (Debian 6)

See also:

This will serve as a general guide for USB wireless devices but may need modifying for your specific one.

  • Edit /etc/apt/sources.list to add the non-free archive and backports (eg: sudo vi /etc/apt/sources.list):
 deb squeeze main non-free
 deb squeeze/updates main non-free
 deb squeeze-updates main non-free
 deb squeeze-backports main non-free
  • Update the package cache:
 sudo apt-get update
  • Download the wifi utils:
 sudo apt-get install wireless-tools usbutils 
  • Download the required firmware and put it in the correct location - you may not need to do this for your adaptor or you may need different firmware - see below.
 sudo apt-get install firmware-atheros
 sudo wget
 sudo cp htc_9271.fw /lib/firmware
  • Add adaptor definition to network config - eg: sudo vi /etc/network/interfaces - add the wlan0 section:
# Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or
# /usr/share/doc/ifupdown/examples for more information.

auto lo

iface lo inet loopback
iface eth0 inet dhcp

# The wireless interface
auto wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa.conf
  • Create the wpa.conf file - eg: sudo vi /etc/wpa.conf:
pairwise=CCMP TKIP
  • Plug in adaptor
  • Confirm adaptor is present:
 root@raspberrypi:~# iwconfig
  lo        no wireless extensions.

  eth0      no wireless extensions.

  wlan0     IEEE 802.11bgn  ESSID:off/any
            Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm
            Retry  long limit:7   RTS thr:off   Fragment thr:off
            Encryption key:off
            Power Management:off

Firmware requirements

If no wlanx device is shown, you might need to download firmware for your USB wifi device (or track down other compatible drivers if they are available). To confirm this, check the dmesg output when you plug in your adaptor - typing dmesg at the command prompt may be sufficient - and look for information related to your adaptor - the example dmesg output below shows what is seen in the event of the TP-Link firmware not being present - notice that the name of the required firmware file is given (htc_9271.fw), the driver name (ath9k_htc) and an error -22 message:

  usb 1- ath9k_htc: Firmware - htc_9271.fw not found
  ath9k_htc: probe of 1- failed with error -22
  usbcore: registered new interface driver ath9k_htc

Armed with this information, try a web search for 'debian 6' and the name of the driver or driver file and/or head over to

Once your adaptor is plugged in and configured you need to start it:

  sudo ifup wlan0

If you are now connected, well done! If not, check your editing and also have a look at the output of dmesg to see if you have any error messages.