Cypress Semiconductor CY8C21534 Spezifikationen PDF herunterladen (Seite 22)

4.3 WiFly WLAN Module

The WiFly wireless unit is an off the shelf 802.11 WLAN module made specifically to

interface with embedded electronic projects. This module makes it possible to bypass

the complex procedure in making custom Transmission Control Protocol/Internet

Protocol (TCP/IP) connections, as well as saving the large amount of memory that it

would take to implement the protocol directly on the microcontroller. Transfer speeds

of the wireless communication can reach up to 4 Mbps. The unit has 8 Mbits of flash

memory and 128 KB of Random Access Memory (RAM). This memory can be used to

store configuration files as well as being used for buffering the incoming data, as the

UART connection transfer is slower than the incoming data from the WLAN.

The WiFly module can be purchased on a breakout board called the Surf Board. The

layout of the WiFly module can be seen in figure 11.

Figure 11: WiFly RN-131GSX Wireless Module. Taken from RN-134 WiFly GSX

Datasheet [7].

The interface to the unit is UART, and as can be seen in figure 11 on the bottom left

side of the circuit, there are power, ground, transmit, and receive pins. The unit can be

configured by connecting the UART pins to a HIN232 Serial transmitter/receiver [8]

and making a serial connection to the unit using Tera Term, PuTTY, or any other serial

connection program. In this command mode many settings can be made.

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Cypress Semiconductor CY8C21534 Spezifikationen Seite 22