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Groups > comp.arch.embedded > #29148

Re: Poor man's PWM

From Don Y <blockedofcourse@foo.invalid>
Newsgroups comp.arch.embedded
Subject Re: Poor man's PWM
Date 2020-01-29 00:17 -0700
Organization A noiseless patient Spider
Message-ID <r0rbj2$u8e$1@dont-email.me> (permalink)
References <r0o0mu$c6l$1@dont-email.me> <h9as3cFsikkU1@mid.dfncis.de> <r0qvlf$crv$1@dont-email.me> <0b3e27d7-cefc-4821-8df3-62cb140ba68c@googlegroups.com>

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On 1/28/2020 10:54 PM, Rick C wrote:
>>> and the hardware still has to be capable of handling each of those
>>> interrupts fast enough, consistently, that you there will be no
>>> flickering caused by the shortest possible time slot being prolonged or
>>> shortened by delays in interrupt processing.  This puts a load on the 
>>> overall design that this scheme cannot reduce.
>> 
>> Obviously you're not a hardware person.
> 
> I don't want to get pissy about it, but obviously you aren't a systems
> person.  The way to deal with jitter in the timing of the pulse edges is to
> make the IRQ for this interrupt highest priority and not lock out interrupts
> for any reason.  Or the actual I/O can be done by timer driven DMA which
> would be independent of the software as long as the DMA and timer are always
> programmed in time to keep running without gaps.  This would still need to
> be done in an IRQ.

Bwahahahaha... says "The Systems Guy" -- with NO KNOWLEDGE OF THE REST OF
THE SYSTEM!

Priceless!

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Thread

Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-27 17:53 -0700
  Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-27 19:29 -0800
    Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-28 20:11 -0700
      Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-28 20:11 -0800
  Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-28 11:29 +0100
    Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-28 20:34 -0700
      Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-28 20:32 -0800
      Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-29 12:53 +0100
  Re: Poor man's PWM Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2020-01-28 14:43 +0100
    Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-28 12:03 -0800
    Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-28 20:54 -0700
      Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-28 21:54 -0800
        Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-29 00:17 -0700
          Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-28 23:40 -0800
            Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-29 00:54 -0700
            Re: Poor man's PWM Paul Rubin <no.email@nospam.invalid> - 2020-01-29 00:04 -0800
              Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-29 02:17 -0700
        Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-29 13:21 +0100
          Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-29 09:51 -0800
            Re: Poor man's PWM Paul Rubin <no.email@nospam.invalid> - 2020-01-29 10:07 -0800
              Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-29 10:14 -0800
                Re: Poor man's PWM Paul Rubin <no.email@nospam.invalid> - 2020-01-29 10:28 -0800
                Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-29 11:40 -0800
                Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-30 10:25 +0100
                Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-30 08:06 -0800
                Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-30 21:21 +0100
                Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-30 15:08 -0800
                Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-31 01:17 +0100
                Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-01-30 17:21 -0800
                Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-31 10:59 +0100
                Re: Poor man's PWM Rick C <gnuarm.deletethisbit@gmail.com> - 2020-02-01 10:18 -0800
            Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-30 10:20 +0100
              Re: Poor man's PWM Tom Gardner <spamjunk@blueyonder.co.uk> - 2020-01-30 10:13 +0000
          Re: Poor man's PWM Paul Rubin <no.email@nospam.invalid> - 2020-01-29 09:57 -0800
            Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-30 10:29 +0100
      Re: Poor man's PWM Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2020-01-29 16:34 +0100
  Re: Poor man's PWM Dimiter_Popoff <dp@tgi-sci.com> - 2020-01-28 17:39 +0200
    Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-28 19:58 -0700
      Re: Poor man's PWM Dimiter_Popoff <dp@tgi-sci.com> - 2020-01-29 18:54 +0200
  Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-01-29 00:17 -0700
    Re: Poor man's PWM David Brown <david.brown@hesbynett.no> - 2020-01-29 13:39 +0100
      Re: Poor man's PWM Paul Rubin <no.email@nospam.invalid> - 2020-01-29 10:08 -0800
  Re: Poor man's PWM Don Y <blockedofcourse@foo.invalid> - 2020-04-27 20:13 -0700

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