12f675

sabobey · Joined: 19 Oct 2008 Posts: 6

How can I make with 12f675 three software pwm? I want to use on rgb. Thanks for your interest.

bkamen · Posted: Fri Oct 26, 2012 11:16 am

With time, learning, the right tools and perseverance?
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Dazed and confused? I don't think so. Just "plain lost" will do. :D

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

There is sample code in the Code Library forum for software PWM of 3 LEDs:
http://www.ccsinfo.com/forum/viewtopic.php?t=30139&highlight=red+green+blue

Mike Walne · Joined: 19 Feb 2004 Posts: 1785 Location: Boston Spa UK

Start from from (say) a 4MHz clock that's 1us per instruction cycle.
Generate interrupts with one of the timers (probably timer0) at 10kHz.
In the ISR turn LEDs on and off as needed at 100Hz.

That will give you 1% resolution, and ~100 instruction cycles for the code to control the LEDs.

If you need either better resolution or more code you'll need a faster clock.

Best of luck.

Mike