Re: Direct digital I/O ?

From	"gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid>
Newsgroups	comp.sys.raspberry-pi
Subject	Re: Direct digital I/O ?
Date	2016-06-13 19:06 +0100
Organization	A noiseless patient Spider
Message-ID	<njmsmo$sok$1@dont-email.me> (permalink)
References	<njbs2a$96b$1@dont-email.me> <njmc5g$iip$1@dont-email.me> <MPG.31c8f3d422128f4c989800@172.16.0.1>

Show all headers | View raw

"Paul" <paul@pcserviceselectronics.co.uk> wrote in message 
news:MPG.31c8f3d422128f4c989800@172.16.0.1...
> You do realise that you have a high likely hood of stopping DRAM refresh
> and other nasties, potentially doing things like bricking your SD card
> let alone cause many other problems.
> If you attach a switch to reset line you have a good chance of needing
> spare SD cards.
> The RPi and the system with all its peripherals is a completely
> different beast to the old systems.
> Even if you could manage to write into memory, with halted CPU, how
> are you going to be sure the on CPU caches KNOW the value is different
> to what they hold.
> What locations are you expecting to examine/modify, as memory management
> unit will make it impossible for you to work out the steps in locations
> of your one task.
> Play with RPi as it is and get to understand how it works as it is.
> Having multiple terminal windows on graphical, and multiple sessions by
> <ALT> + <F1> onwards gives you ability to do many things at once and
> stop errant tasks etc..

It seems as though you lack either experience or knowledge of working
with electronics and microprocessors at the soldering iron and logic gate 
level?

Back to comp.sys.raspberry-pi | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-09 14:47 +0100
  Re: Direct digital I/O ? GlowingBlueMist <GlowingBlueMist@blackhole.io> - 2016-06-09 11:22 -0500
  Re: Direct digital I/O  ? "Dave Liquorice" <allsortsnotthisbit@howhill.com> - 2016-06-09 19:56 +0100
    Re: Direct digital I/O  ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-10 19:55 +0100
      Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-10 22:27 +0000
        Re: Direct digital I/O  ? mm0fmf <none@invalid.com> - 2016-06-11 07:45 +0100
          Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-11 08:37 +0000
            Re: Direct digital I/O ? The Natural Philosopher <tnp@invalid.invalid> - 2016-06-11 09:41 +0100
              Re: Direct digital I/O ? "Dave Liquorice" <allsortsnotthisbit@howhill.com> - 2016-06-11 11:17 +0100
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-11 14:00 +0100
                Re: Direct digital I/O ? cb@elaine.df.lth.se (Christian Brunschen) - 2016-06-11 16:12 +0000
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-12 22:00 +0100
                Re: Direct digital I/O ? cb@elaine.df.lth.se (Christian Brunschen) - 2016-06-12 22:40 +0000
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-13 11:02 +0100
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-12 22:04 +0100
              Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-11 13:49 +0100
            Re: Direct digital I/O  ? Rob <nomail@example.com> - 2016-06-11 09:23 +0000
              Re: Direct digital I/O  ? Ahem A Rivet's Shot <steveo@eircom.net> - 2016-06-11 10:47 +0100
            Re: Direct digital I/O  ? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-06-11 12:46 -0400
              Re: Direct digital I/O  ? mm0fmf <none@invalid.com> - 2016-06-12 09:20 +0100
                Re: Direct digital I/O ? Michael J. Mahon <mjmahon@aol.com> - 2016-06-12 11:07 -0500
                Re: Direct digital I/O  ? andrew@cucumber.demon.co.uk (Andrew Gabriel) - 2016-06-12 16:13 +0000
                Re: Direct digital I/O  ? jeffj@panix.com (Jeff Jonas) - 2016-07-01 20:39 -0400
                Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-07-02 10:40 +0100
                Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-02 13:55 +0000
                Re: Direct digital I/O ? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-07-02 19:22 +0300
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-07-02 17:47 +0100
                Re: Direct digital I/O ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-02 17:07 +0000
                Re: Direct digital I/O ? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-07-02 21:30 +0300
                Re: Direct digital I/O ? The Natural Philosopher <tnp@invalid.invalid> - 2016-07-02 19:35 +0100
                Re: Direct digital I/O ? Dave Higton <dave@davehigton.me.uk> - 2016-07-02 19:43 +0100
                Re: Direct digital I/O ? The Natural Philosopher <tnp@invalid.invalid> - 2016-07-02 20:07 +0100
                Re: Direct digital I/O  ? andrew@cucumber.demon.co.uk (Andrew Gabriel) - 2016-07-03 18:59 +0000
                Re: Direct digital I/O  ? "Ivan D. Reid" <Ivan.Reid@ivan.fsnet.co.uk> - 2016-07-03 19:15 +0000
  Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 14:23 +0100
    Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-13 14:13 +0000
      Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-13 15:09 +0000
        Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 17:48 +0100
      Re: Direct digital I/O  ? mm0fmf <none@invalid.com> - 2016-06-13 17:45 +0100
        Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-13 17:04 +0000
          Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:13 +0100
      Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 17:47 +0100
    Re: Direct digital I/O  ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-13 17:49 +0100
      Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:07 +0100
      Re: Direct digital I/O ? rickman <gnuarm@gmail.com> - 2016-06-13 14:25 -0400
        Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:45 +0100
          Re: Direct digital I/O ? Jim H <invalid@invalid.invalid> - 2016-06-13 20:14 +0000
            Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-14 09:38 +0100
        Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:57 +0100
          Re: Direct digital I/O ? Mike Fleming <{mike}@tauzero.co.uk> - 2016-06-14 10:48 +0100
            Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-14 11:41 +0100
              Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-14 11:48 +0100
            Re: Direct digital I/O ? rickman <gnuarm@gmail.com> - 2016-06-14 20:24 -0400
              Re: Direct digital I/O ? The Natural Philosopher <tnp@invalid.invalid> - 2016-06-15 08:13 +0100
                Re: Direct digital I/O ? rickman <gnuarm@gmail.com> - 2016-06-15 03:26 -0400
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 08:54 +0100
                Re: Direct digital I/O ? AndyW <Andy@nojunqmail.com> - 2016-06-15 16:48 +0100
                Re: Direct digital I/O ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-15 21:02 +0000
                Re: Direct digital I/O ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-15 11:21 +0000
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 16:21 +0100
              Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 08:52 +0100
              Re: Direct digital I/O ? Gordon Levi <gordon@address.invalid> - 2016-06-15 18:57 +1000
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 10:28 +0100
                Re: Direct digital I/O ? rickman <gnuarm@gmail.com> - 2016-06-15 10:57 -0400
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 16:23 +0100
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-15 16:46 +0100
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 17:04 +0100
                Re: Direct digital I/O ? Rob Morley <nospam@ntlworld.com> - 2016-06-15 17:43 +0100
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 20:57 +0100
    Re: Direct digital I/O  ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-13 17:46 +0100
      Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:06 +0100

csiph-web