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In this project,
the green chipset TRF6900/MSP430 is used to improve the ease of
use of IrDA enabled devices. An ISM/IrDA repeater is built, which
extends the possible range between two IrDA devices to around
10 meters. In addition to that, the new link does not require
a line of sight between the two devices
anymore. The
two most important disadvantages of common IrDA connections are
eliminated! The heart of the application is the low power microcontroller
MSP430 and the transceiver chip TRF6900. The data, received at
the IrDA transceiver is processed in the communication stack of
the MSP430 and sent over the air to the other peer. The communication
protocol implemented on the MSP430 is capable of correcting up
to 6 bit errors within one data frame (6 bytes with Golay(23,12)).
In addition to that, the implemented frequency hopping allows
to use 31 channels within the 868MHz ISM Band. Interruption due
to fading or other users are significantly shorter or even do
not appear. The integrated DDS of the TRF6900 is a key component
for the realization of this frequency hopping application.
Block
Diagram
Reto Bucher
& Marcel Wattinger
Bubikon, Switzerland
rbu@elektrobit.ch
& mwa@elektrobit.ch
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