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replacement CM11a firmware available
I have made available on www.danlan.com/homeauto.html source for replacement
firmware for the CM11a along with a unix daemon that provides my standard
The replacement firmware is in no way compatible with the OEM firmware and
also requires certain pins to be rerouted between the PIC and CM11a board.
The firmware provides a low-level interface to the power line. Received
bits are grouped 6 at a time and sent to the host. The host transmits
by specifying a bit string and a repeat count. All encoding/decoding is
done in the host. Normally once the host has seen 7 or more zero bits
further zeroes are suppressed, but for full real-time analysis a flag is
provided to force all bits to be transferred. An additional flag is
available to disable three-phase transmission support and the supplied
daemon sets this flag by default.
I've been running this code for a few days but it should of course be
considered preliminary. Further documentation will be available depending
on the level of interest...
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