Re: Cortex-Mx MCUs with SWD access locked

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.arch.embedded
Subject	Re: Cortex-Mx MCUs with SWD access locked
Date	2022-06-24 20:34 +0200
Organization	A noiseless patient Spider
Message-ID	<t95030$f52$1@dont-email.me> (permalink)
References	<t92mgi$d1l$1@dont-email.me> <t93vu7$ukp$1@dont-email.me> <t949sk$4jp$1@dont-email.me> <t94hhi$u4k$1@dont-email.me> <nnd$6eee50df$7dbf7e68@8d4ce289928ac989>

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On 24/06/2022 20:29, Stef wrote:
> On 2022-06-24 pozz wrote in comp.arch.embedded:
>> Il 24/06/2022 14:15, David Brown ha scritto:
>>
>>> Of course you could always have had damage from ground loops, spikes
>>> when plugging the debugger in and out (if power is on), short-circuits
>>> when trying to use an oscilloscope probe with clumsy fingers, etc.  If
>>> you have access to an X-Ray machine, you might be able to get some idea
>>> about what happened.
>>
>> I admit I don't have professional workbench with anti-static writ strap
>> band and so on, but I worked for many years without these kind of
>> problems. It's strange I encountered so many problems concentrated in a
>> few weeks.
>>
>> I will understand the problem of ground loops.
> 
> Anti-static measures will not help for any of the problems David
> describes. But they will prevent damage from ESD. Which could also be a
> source for your problem.
> 
> Has the weather been very dry in those problem weeks? Or did you change
> your floor or did you get new shoes?
> 
> 

My experience with ESD damage is that it is often subtle - it leads to 
long-term reliability issues, rather than outright failures.  So the 
production department at my company is extremely careful about ESD.  Up 
in the development department, we can be a bit laxer as long as the 
devices are not going to customers (or at least, not going further than 
the customers' development departments).  I can't remember ever having a 
failure that I could definitely attribute to ESD damage in my lab, while 
I have definitely solved reliability problems by extra ground connections.

Mind you, I would still avoid woollen slippers on a nylon carpet!

Thread

Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-23 23:38 +0200
  Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-24 11:25 +0200
    Re: Cortex-Mx MCUs with SWD access locked dalai lamah <antonio12358@hotmail.com> - 2022-06-24 12:22 +0200
      Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-24 16:27 +0200
        Re: Cortex-Mx MCUs with SWD access locked dalai lamah <antonio12358@hotmail.com> - 2022-06-24 16:42 +0200
          Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-24 16:56 +0200
            Re: Cortex-Mx MCUs with SWD access locked dalai lamah <antonio12358@hotmail.com> - 2022-06-24 17:16 +0200
          Re: Cortex-Mx MCUs with SWD access locked David Brown <david.brown@hesbynett.no> - 2022-06-24 18:26 +0200
            Re: Cortex-Mx MCUs with SWD access locked Dimiter_Popoff <dp@tgi-sci.com> - 2022-06-24 20:00 +0300
            Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-27 08:54 +0200
              Re: Cortex-Mx MCUs with SWD access locked David Brown <david.brown@hesbynett.no> - 2022-06-27 09:23 +0200
    Re: Cortex-Mx MCUs with SWD access locked David Brown <david.brown@hesbynett.no> - 2022-06-24 14:15 +0200
      Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-24 16:25 +0200
        Re: Cortex-Mx MCUs with SWD access locked Stef <me@this.is.invalid> - 2022-06-24 20:29 +0200
          Re: Cortex-Mx MCUs with SWD access locked David Brown <david.brown@hesbynett.no> - 2022-06-24 20:34 +0200
            Re: Cortex-Mx MCUs with SWD access locked Stef <me@this.is.invalid> - 2022-06-24 22:12 +0200
              Re: Cortex-Mx MCUs with SWD access locked David Brown <david.brown@hesbynett.no> - 2022-06-25 10:19 +0200
          Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-27 09:06 +0200
            Re: Cortex-Mx MCUs with SWD access locked David Brown <david.brown@hesbynett.no> - 2022-06-27 09:25 +0200
        Re: Cortex-Mx MCUs with SWD access locked Reinhardt Behm <rbehm@hushmail.com> - 2022-06-26 14:25 +0000
          Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-27 10:07 +0200
            Re: Cortex-Mx MCUs with SWD access locked Reinhardt Behm <rbehm@hushmail.com> - 2022-06-27 15:11 +0000
              Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-27 23:50 +0200
                Re: Cortex-Mx MCUs with SWD access locked Stef <me@this.is.invalid> - 2022-06-28 11:23 +0200
                Re: Cortex-Mx MCUs with SWD access locked pozz <pozzugno@gmail.com> - 2022-06-28 12:42 +0200
                Re: Cortex-Mx MCUs with SWD access locked Stef <me@this.is.invalid> - 2022-06-28 17:06 +0200

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