> The filter back requires an SPI input provided by a processor board
I've thought a few times that it'd be nice to have some spare IO pins
provided on the SoftRock boards for things like this -- e.g. use an
ATmega328 or similar rather than the current 8-pin AVR. One of the
projects I've been meaning to get around to for a while is to add a
transmitter to my Xtall+Lite 9.0 (i.e. build the transmitter half of the
RXTX design, using the existing Si570's output), but in order to get
enough IO pins to be able to toggle PTT etc. I'll have to retrofit a
larger AVR and port the firmware across.
I guess one approach would be to make a SoftRock "shield" for the
Arduino development boards; that'd give you loads of IO pins, and would
also work with the Arduino-compatible ARM boards if you wanted to build
a standalone radio. (Hm, and you could even do separate RX/TX/filter
shields... maybe this is worth playing with.)
Adam Sampson <ats@...