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| Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc. |
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Thread Tools | Display Modes |
9th May 2008, 06:53 PM
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Experienced Member
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Multiple PWMs, how?
I've seen various projects that have programmed a PIC to have multiple independent(maybe?) PWM outputs, even thought the chips only have one in hardware (did I see one with none?).
Does anyone know how this is done? |
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9th May 2008, 06:55 PM
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Experienced Member
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How many do you need?
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9th May 2008, 06:59 PM
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Experienced Member
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Erch... I dunno... At least 3 for an RGB idea I have (moodlight-thing), but the more the merrier.
BTW, that was hella-fast! |
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9th May 2008, 07:02 PM
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Experienced Member
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For LEDs a simple software PWM is plenty.
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9th May 2008, 07:04 PM
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Experienced Member
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Yarh, but how? Does it have nothing to do with the hardware PWM then? And doesn't it tie up all the processing time?
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9th May 2008, 07:06 PM
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Experienced Member
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It can be all interrupt driven. Lots of code samples on the net I'm sure.
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9th May 2008, 07:09 PM
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Experienced Member
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AAAHH!! I find it, I find it! No worry.
 There is a technical document from Microchip themselves. AN1074 - Software PWM Generation for LED Dimming and RGB Color Applications. |
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9th May 2008, 07:09 PM
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Experienced Member
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Looks like I answered my own question...
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9th May 2008, 07:32 PM
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Experienced Member
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The App notes are really handy.
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9th May 2008, 08:14 PM
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Moderator
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If you want several hardware PWM's look at one of my favorites the 18F1330. It also has a PLL that works with the internal 8MHz clock that bumps it up to 32MHz.
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