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PWM audio Web links
Topic last updated 12 Dec 2011, by 
Philips Philips.
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Philips Philips.
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Thought this was a great find, with a little bit of work could be ported to mbed code.
Shows how to set up the lpc1768 for PWM audio output http://msys-mv.blogspot.com/2011/05/mcpwm-in-lpc17xx.html
a few examples http://code.google.com/p/embeddedhobby/downloads/list
lots of examples with PWM wav player http://code.google.com/p/cortex-m3-tutorials/downloads/list
http://gvworks.blogspot.com/2011/05/wav-player-with-lpc1768-and-sd-card.html