[Autopilot] Overclocking the Mega32?

[Trammell H. <hu...@sw...>]

Does anyone know if it is acceptable to overclock the Mega32 by
about 15%?  I noticed in the data sheet that it has UART settings
all the way up to 20 MHz, despite the chips only being rated at
16 MHz.

The best one is 18.432 MHz, which gives 0% error rates all the way up
to 115k baud.  38.4 just isn't enough serial bandwidth to send all the
sensor data at 200 Hz and deal with the other anciliary outputs.

I'm working on adding multiple servo power bus monitoring (current
and voltage), as well as closed loop feedback for each servo.
All of these extra features need serial port bandwidth.  I would
also like to increase the sensor output rate to 400 Hz so that we
are well above Nyquist for all the sensors.

Based on some things that I have read online, the issue with running
at 20 MHz has to do with EEPROM accessing.  Interestingly, most of
the satellite TV crackers are using Mega's at 18.432 MHz, seemingly
without any problems.

Trammell
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