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Texas Instruments eZ430-Chronos Manual

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3.6.2 Chronos-to-Chronos (C2C) Communication
This feature is a demonstration of what can be done using SimpliciTI (peer-to-peer) and two
eZ430-Chronos watches. This code can be also be adapted to be used for custom applications, where the
communication of two eZ430-Chronos watches is required. This mode allows one watch to wirelessly
control the other. After a successful connection, it is possible to change the menus and show the
accelerometer data from one watch in the other. The communication is bidirectional, so the control can be
done from both watches.
3.6.2.1 Detailed Description of C2C Communication
When the C2C mode starts, the system sets a new SimpliciTI address for the eZ430-Chronos watches
based on the time and accelerometer data. In SimpliciTI peer-to-peer mode, the connection occurs when
one device listens and other tries to link. In C2C mode, the devices must change between listen and link
modes to enable bidirectional control. It is important to do perform the switch randomly to ensure at least
one possible state for connection. To enable this process, , one timer interrupt is set to 100 ms. The
interrupt routine calls a function that changes the connection mode in a pseudo-random way, using the
accelerometer data.
After the connection is established, the first message synchronizes the timers from both watches. This
way it is possible to ensure low power to this system, making the watches sleep most of the time and
wake for a short period of time to send and receive data.
46
eZ430-Chronos Software SLAU292D–November 2009–Revised March 2011
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© 2009–2011, Texas Instruments Incorporated
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