Morse Code Copy Computer

I've been using an Analog Devices EZ-KIT-LITE development board
as the audio to digital front end for computer copy of Morse Code.
This board has a 2181 16 bit fixed point DSP and a stereo 16 bit SoundPort Codec.

I use a Goertzel transform as a tone detector.
A DSP flag output is used to indicate a detected tone.
This signal is wired to a timer in the Programmable Peripheral, which is interfaced to
the MC68306 single board computer.  The 68306 tokenizes the timer output, then
parses the tokens into Morse characters and finally converts the Morse characters
into ASCII characters.