In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Ray;

You are absolutely correct about the A/D being implemented in software; that is, with the addition of two resistors and one small non-critical capacitor. Works a "treat". In fact if need be, you can dynamically vary the resolution of the Virtual A/D from 2 bits (or less, but then it's hardly an A/D) through 14 bits. At that extreme the SX's noise starts to get to you. At 8 bits you resolve 20 milliVolts in a 5 Volt range very nicely. The trade-off is a linear speed-for-bits relationship.

Works great for doing DFT's and FFT's in the SX for audio, tone detection etc.

I'm curious which of the two RTOS's you are pursuing. The non-preemptive is very simple, and of course simple minded. The pre-emptive is fairly tricky, and takes some experience to get the full gist.

Keep on pluggin' !

Cheers,

Peter (pjv)

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=103038#m103523

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)