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GNU/Linux Rapid Embedded Programming by Rodolfo Giometti

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WLAN devices in Linux

WLAN devices (or Wi-Fi) are usually identified in the GNU/Linux system with wlan0, wlan1, and so on, and they can be added to an existing system in several ways. The Wandboard comes with its own Wi-Fi chip but it's quite common (especially for cost reasons) that an embedded computer has no Wi-Fi at all. So, in this case, we can provide a wireless connection to our embedded kit using an available CPU's communication bus, such as the USB bus and (sometimes) the SDIO or SPI bus.

Pluggable external WLAN devices

As a simple example, in the following image, there is a picture of a USB WLAN device that can be connected with every computer that has a USB host port:

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