The project contained in this repository is a mechanism for capturing the
decoded 16-bit linear PCM form of voice call downlink on FreeCalypso boards
via MCSI, and for feeding 16-bit linear PCM into call uplink via the same
interface.  The mechanism consists of a Lattice Icestick FPGA board, a gateware
image for this FPGA, and host programs that interface to it via the UART channel
of the on-board FT2232H.

So far only downlink Rx has been implemented; to get the uplink path, more work
is needed on both FPGA gateware and software components.