formatting link
source for replacementfirmware for the CM11a along with a unix daemon that provides my standard
tcp/ip interface.
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...
Dan Lanciani
ddl@danlan.*com