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The following figure shows the different components on the eZ430-RF2500. In particular, some
of pins of the MSP430 are exported as
extension pins
P1 through
P18 . Note that
some of these pins may be unused pins of the MSP430, others are already used, butduplicated as extension ports for debugging purposes.
As show in the following figure,
6 wires interconnect the
MSP430 (micro-controller) with the
CC2500 (radio). 4 of them
form the
SPI link, a serial link which enables digital communication. There is a
hardware SPI modem on each side of the link, the configuration of which is handledby the drivers.
The remaining two links are wires used by the CC2500 to wake-up the MSP430.
That is, the MSP430 configures its ports
P2.6 and
P2.7 as input, with interrupts. It
then configures the CC2500 to trigger
GDO0 or
GDO2 on a given event (typically,
when receiving a packet). This enables the MSP430 to enter LPM3. Note that thesewires are also routed to extension port pins
P13 and
P14 . The drivers are used in
such a way that only
GDO0 is used for proper operation. You can thus configure
GDO2 as you wish, and monitor its state with an oscilloscope on extension port pin
P14 .
Refer to the eZ430-RF2500 Development Tool User's Guide for details about the eZ430-RF2500 platform.
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