Hi, I'm looking for a tutorial on how to write a FFT routine in assembler language for the AVR AtMega uP. Have found one dealing with the Goertzel algorithm and it works very nice. Google shows me zillions of FFT links, but nothing using an AVR. Thanks for any help. Mark Jordan -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.