Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.arch.embedded
Subject	Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on
Date	2021-10-25 20:58 +0200
Organization	A noiseless patient Spider
Message-ID	<sl6uoh$77d$1@dont-email.me> (permalink)
References	(3 earlier) <sl4dm3$5ut$1@dont-email.me> <sl4fk0$2si$1@dont-email.me> <itn713FpntqU1@mid.individual.net> <sl6a1d$4ci$1@dont-email.me> <ito14pF55oU1@mid.individual.net>

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On 25/10/2021 17:34, Niklas Holsti wrote:

> And if each of those two items is large, yes. But here we have a FIFO of
> 8-bit characters... few programs are so tight on memory that they cannot
> stand one unused octet.

I remember a program I worked with where the main challenge for the
final features was not figuring out the implementation, but finding a
few spare bytes of code space and a couple of spare bits of ram to use.
 And that was with 32 KB ROM and 512 bytes RAM (plus some bits in the
registers of peripherals that weren't used).  That was probably the last
big assembly program I wrote - non-portability was a killer.

Thread

How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on pozz <pozzugno@gmail.com> - 2021-10-23 00:07 +0200
  Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Clifford Heath <no.spam@please.net> - 2021-10-23 13:40 +1100
  Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-22 22:09 -0700
    Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on pozz <pozzugno@gmail.com> - 2021-10-23 22:12 +0200
      Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-23 15:59 -0700
  Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-23 18:09 +0200
    Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on pozz <pozzugno@gmail.com> - 2021-10-23 22:49 +0200
      Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-24 13:02 +0200
        Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on pozz <pozzugno@gmail.com> - 2021-10-24 17:39 +0200
          Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-24 18:37 +0200
    Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on pozz <pozzugno@gmail.com> - 2021-10-25 20:15 +0200
      Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-25 20:54 +0200
      Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Richard Damon <Richard@Damon-Family.org> - 2021-10-25 20:31 -0400
  Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Johann Klammer <klammerj@NOSPAM.a1.net> - 2021-10-24 12:39 +0200
    Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Dimiter_Popoff <dp@tgi-sci.com> - 2021-10-24 14:14 +0300
      Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-24 12:54 -0700
        Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Dimiter_Popoff <dp@tgi-sci.com> - 2021-10-24 23:27 +0300
          Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-24 14:08 -0700
            Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Dimiter_Popoff <dp@tgi-sci.com> - 2021-10-25 00:50 +0300
              Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-24 15:47 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Dimiter_Popoff <dp@tgi-sci.com> - 2021-10-25 02:32 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-24 18:34 -0700
            Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-25 09:41 +0200
            Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-10-25 10:56 +0300
              Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-25 01:19 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-10-25 11:52 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-25 02:50 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-25 13:49 +0200
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-10-25 15:16 +0300
          Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-10-25 11:09 +0300
            Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-25 01:28 -0700
              Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-10-25 12:06 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-25 02:35 -0700
            Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Dimiter_Popoff <dp@tgi-sci.com> - 2021-10-25 16:04 +0300
              Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-10-25 18:34 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-25 10:43 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Dimiter_Popoff <dp@tgi-sci.com> - 2021-10-25 20:53 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-25 11:02 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on pozz <pozzugno@gmail.com> - 2021-10-25 19:52 +0200
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-25 11:10 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-10-25 21:33 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Dimiter_Popoff <dp@tgi-sci.com> - 2021-10-25 22:09 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-10-25 22:53 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Dimiter_Popoff <dp@tgi-sci.com> - 2021-10-25 23:02 +0300
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-26 00:05 +0200
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on pozz <pozzugno@gmail.com> - 2021-10-25 23:46 +0200
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-25 20:58 +0200
            Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Clifford Heath <no.spam@please.net> - 2021-10-26 08:43 +1100
        Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on antispam@math.uni.wroc.pl - 2021-10-25 21:32 +0000
          Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-25 15:24 -0700
            Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on antispam@math.uni.wroc.pl - 2021-10-27 00:20 +0000
              Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-26 17:52 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on antispam@math.uni.wroc.pl - 2021-10-27 05:22 +0000
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-29 15:36 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on antispam@math.uni.wroc.pl - 2021-10-31 22:54 +0000
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-10-31 20:37 -0700
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on antispam@math.uni.wroc.pl - 2021-11-11 04:34 +0000
                Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on Don Y <blockedofcourse@foo.invalid> - 2021-11-19 16:21 -0700
      Re: How to write a simple driver in bare metal systems: volatile, memory barrier, critical sections and so on David Brown <david.brown@hesbynett.no> - 2021-10-25 08:57 +0200

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