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Re: replacement CM11a firmware available
About 3 years back, I persuaded Dom Kinzer of ZBasic to add low level X-10
functions implemented in the background and buffered a la a software UART.
It automatically handles all I/O, setting flags to signal a reception, etc.
and filling a bit array as a signal is received. For output you merely fill
a bit array and bits are sent automatically at ZC. It even incorporates the
extra AGC signals needed with a CM15A should you want to play with it.
The cheapest ZBasic chip is the ZX-328n (DIP-28) at $10 or the ZX-32n
(TQFP-32) at $15. Both have a bootloader preloaded. The ZBasic software is
free. It compiles to native Atmel machine code for the 'n' version of the
You would need to mount them to a daughterboard that then replaces the X10
MCU. And they need a XTAL and serial interface circuitry. These days there
are inexpensive ethernet-serial interfaces for those who want a network
ddl@danlan.*com (Dan Lanciani) wrote:
>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...
> Dan Lanciani
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