Implementing 802.11 with Microcontrollers: Wireless Networking for Embedded Systems Designers

Chapter 4: 802.11b CompactFlash Network Interface Cards

It would be next to impossible to get a microcontroller on the air with 802.11b without the PRISM radio hardware contained within an 802.11b NIC like the TEW-222CF. I'm sure none of the TEW-222CF designers (or any other 802.11b CompactFlash NIC designers for that matter) were thinking that their CompactFlash 802.11b products would be used by an 8-bit microcontroller as a tool to enter the 802.11b wireless LAN sanctum that has previously been reserved for Linux and Windows operating system. With the sudden demise of the TREND- net TEW-222CF, I was forced to test and certify other manufacturer's 802.11b CompactFlash NICs for AirDrop compatibility.

They Were Not Designed To Do This

If you read the marketing stuff that describes the TEW-222CF, it was designed to be used in PDAs, Palm PCs and Pocket PCs. With an available PCMCIA-to-CompactFlash converter, the TEW-222CF was also intended to replace an 802.11b PCMCIA NIC in your laptop personal computer. All of the downloadable and CDROM TEW-222CF drivers are geared towards Windows and I didn't see anything in the marketing data sheet that mentioned it was compatible with many of the popular off-the-shelf 8-bit microcontrollers from Microchip and Atmel. Come to think of it, I didn't see any references to Linux drivers either. Well, things are about to make a radical change. TRENDnet, Netgear, Linksys, Zonet, Xterasys. Welcome to Smallville, 802.11b.

The TEW-222CF

The TEW-222CF is a CompactFlash Type 1 card, which is about 1.7 mm thinner than a CompactFlash Type II card. The TEW-222CF...

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