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References for AVR/mega128 with Cypress CYWM6935 as a spectrum analyser: (scrying_tech_notes#37)

Sample SPI code: http://code.google.com/p/cywusb/source

Parallel port example: http://www.wireless.org.au/~jhecker/specan/

Scan for 50uS RSSI (32 levels) for 83 channels

Further microcontroller example:

http://www.circuitcellar.com/library/print/0406/Armitage%2D189/

[todo: test and make use of serial library]