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Re: I2C Single Master: peripheral or bit banging?

From David Brown <david.brown@hesbynett.no>
Newsgroups comp.arch.embedded
Subject Re: I2C Single Master: peripheral or bit banging?
Date 2020-11-21 12:06 +0100
Organization A noiseless patient Spider
Message-ID <rpasch$im9$1@dont-email.me> (permalink)
References (1 earlier) <%dPtH.19234$2j.7316@fx38.iad> <rp8j1c$k9g$1@dont-email.me> <rp8n5k$k5f$1@dont-email.me> <rp8r4d$lns$1@dont-email.me> <rp8uvt$mbe$1@dont-email.me>

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On 20/11/2020 18:39, Tauno Voipio wrote:

> I have had thousands of industrial instruments in the field for decades,
> each running some internal units with I2C, some bit-banged and others
> on the hardware interfaces on the processors used, and not a single
> failure due to I2C hanging.
> 

The only time I have seen I²C buses hanging is during development, when
you might be re-starting the cpu in the middle of an operation without
there being a power-on reset to the slave devices.  That can easily
leave the bus in an invalid state, or leave a slave state machine out of
synchronisation with the bus.  But I have not seen this kind of thing
happen in a live system.

> Please remember that the I2C bus is an Inter-IC bus, not to be used for
> connections to the outside of the device, preferably only on the same
> circuit board. There should be no external connectors where e.g. the
> shorts between the SCL and SDA could happen.
> 
> All the hardWare I2C controls have been able to be restored to a
> sensible state with a software reset after a time-out. This includes
> the Atmel chips.
>

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Thread

I2C Single Master: peripheral or bit banging? pozz <pozzugno@gmail.com> - 2020-11-20 09:43 +0100
  Re: I2C Single Master: peripheral or bit banging? Bernd Linsel <bl1@gmx.com> - 2020-11-20 11:38 +0100
    Re: I2C Single Master: peripheral or bit banging? pozz <pozzugno@gmail.com> - 2020-11-20 12:45 +0100
      Re: I2C Single Master: peripheral or bit banging? Bernd Linsel <bl1@gmx.com> - 2020-11-20 15:57 +0100
  Re: I2C Single Master: peripheral or bit banging? Richard Damon <Richard@Damon-Family.org> - 2020-11-20 08:09 -0500
    Re: I2C Single Master: peripheral or bit banging? pozz <pozzugno@gmail.com> - 2020-11-20 15:15 +0100
      Re: I2C Single Master: peripheral or bit banging? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-11-20 17:25 +0200
        Re: I2C Single Master: peripheral or bit banging? pozz <pozzugno@gmail.com> - 2020-11-20 17:33 +0100
          Re: I2C Single Master: peripheral or bit banging? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-11-20 19:39 +0200
            Re: I2C Single Master: peripheral or bit banging? Dimiter_Popoff <dp@tgi-sci.com> - 2020-11-20 23:25 +0200
              Re: I2C Single Master: peripheral or bit banging? Grant Edwards <invalid@invalid.invalid> - 2020-11-20 23:09 +0000
                Re: I2C Single Master: peripheral or bit banging? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-11-21 11:46 +0200
            Re: I2C Single Master: peripheral or bit banging? David Brown <david.brown@hesbynett.no> - 2020-11-21 12:06 +0100
              Re: I2C Single Master: peripheral or bit banging? pozz <pozzugno@gmail.com> - 2020-11-22 17:48 +0100
                Re: I2C Single Master: peripheral or bit banging? David Brown <david.brown@hesbynett.no> - 2020-11-22 19:44 +0100
                Re: I2C Single Master: peripheral or bit banging? pozz <pozzugno@gmail.com> - 2020-11-23 08:44 +0100
                Re: I2C Single Master: peripheral or bit banging? David Brown <david.brown@hesbynett.no> - 2020-11-23 09:42 +0100
                Re: I2C Single Master: peripheral or bit banging? David Brown <david.brown@hesbynett.no> - 2020-11-23 09:44 +0100
                Re: I2C Single Master: peripheral or bit banging? Richard Damon <Richard@Damon-Family.org> - 2020-11-23 07:25 -0500
                Re: I2C Single Master: peripheral or bit banging? Reinhardt Behm <rbehm@hushmail.com> - 2020-11-24 18:15 +0800
  Re: I2C Single Master: peripheral or bit banging? stephen@mpeforth.com (Stephen Pelc) - 2020-11-20 14:53 +0000
  Re: I2C Single Master: peripheral or bit banging? John Speth <johnspeth@yahoo.com> - 2020-11-20 06:56 -0800
  Re: I2C Single Master: peripheral or bit banging? Michael Kellett <mk@mkesc.co.uk> - 2020-11-21 09:10 +0000
    Re: I2C Single Master: peripheral or bit banging? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-11-21 11:48 +0200
    Re: I2C Single Master: peripheral or bit banging? pozz <pozzugno@gmail.com> - 2020-11-22 17:35 +0100
      Re: I2C Single Master: peripheral or bit banging? Michael Kellett <mk@mkesc.co.uk> - 2020-11-22 20:21 +0000
  Re: I2C Single Master: peripheral or bit banging? Mike Perkins <spam@spam.com> - 2020-11-25 17:43 +0000
    Re: I2C Single Master: peripheral or bit banging? pozz <pozzugno@gmail.com> - 2020-11-26 08:54 +0100
      Re: I2C Single Master: peripheral or bit banging? Mike Perkins <spam@spam.com> - 2020-11-26 14:34 +0000

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