View Full Version : I/O assitant PLL documentation?

11-01-2006, 01:10 AM
I've been looking in the manual and examples·but other than microphone_to_headphone.spin I·can't find any explainination of·how·to use the I/O assistant + PLL. I'm specifically looking for if its possible, and hopefully examples, on how to do AM and FM demodulation·for making a scanner.

Any pointers to additional documentation would be appreciated.

11-01-2006, 01:17 AM
Maybe you haven't seen this...


Chip Gracey
Parallax, Inc.

11-01-2006, 01:28 AM
No I hadn't. For some reason my eyes read the file as CRT.spin so I never openned it.

I'll look it over.


Graham Stabler
11-01-2006, 02:55 AM
I'm sorry to say that I didn't find that program of much help. Its mainly what is in the manual and that didn't help much either. Looking forward to Paul's further documentation.


Paul Baker
11-01-2006, 05:00 AM
Regor, Im afraid you'll be disappointed. The PLL for the counter module is only active for modes 1-3. These are useful for generating high frequencies, but not for reading them. You may be able to do some sort of external phase detection circuitry where the Propeller provides the reference frequency, but communications is one of my weakest subjects in the field so I won't be able to help you much.

Paul Baker (mailto:pbaker@parallax.com)
Propeller Applications Engineer
[/url][url=http://www.parallax.com] (http://www.parallax.com)
Parallax, Inc. (http://www.parallax.com)