PWM function generator

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A simple 0...15kHz function generator based on fast PWM and DDS. It is controlled via RS-232.

Devices used:
* ATtiny2313 xBoard v2
* EDIROL UA-25 USB Audio Capture interface
* Compal laptop

Applications:
* Soundcard Oscilloscope (available free for educational purposes here: http://www.zeitnitz.de/Christian/scope_en )
* LFFunctionGenerator RS-232 link.

If you would like to obtain the schematics/code for ATtiny2313 xBoard v2 please leave a comment. I will then eventually publish an article on this matter.
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