Cypress Semiconductor CY8C21534 Especificações descarregar pdf (Página 30)

5.3 Interfacing WLAN Module

The interfacing of the WiFly module involved both hardware and software

configuration. An external antenna was purchased for use with the Wifly unit, to give a

boost of 2 decibels (dB) to the antenna system. The range of the internal antenna

proved to be too weak for reliable communications. The physical connection to the

WiFly unit is a common UART connection. The connections were taken to the pins of

the Communications MCU via a set of manual switches providing easy system

programming capabilities. Figure 17 shows the connection of the manual switches.

Figure 17: Manual Switching of WiFly Connections.

As can be seen in figure 17, the power and data lines can be isolated from the

Communications PSoC and directed to the Serial to UART adaptor HIN232 [8]. This is

to alleviate any communication problems while programming the WiFly unit via its

serial connection, as a simultaneous connection of the data lines to the

Communications MCU might alter the data during transfer.

The software configuration of the WiFly unit is done by establishing a connection with

a serial communications program on the computer such as Putty or Tera Term. The set

comm open command was set to transmit a byte representing the letter O out of the

UART connection to the Communications MCU when a TCP/IP connection was

established. This is to tell the MCU that the connection has been made and it can start

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