Reason behind MISRA rule 111

In message <irh2ne.10s.1@stefan.msgid.phost.de>, Stefan Reuther
<stefan.news@arcor.de> writes
>Vinzent Hoefler wrote:
>> Stefan Reuther wrote:
>> Maybe original MISRA wasn't intended for systems which even had I/O. ;)
>
>Indeed, many of the rules make much more sense if you have an engine
>control unit in mind, not an infotainment device with a megapixel screen
>and a few Gigs of flash.

All systems MISRA is aimed at have IO... It is just that most don't have
screens.


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Chris H wrote:

> All systems MISRA is aimed at have IO... It is just that most don't have
> screens.

Depends on what you count as I/O. Of course, any electric wire going in or
out the MCU are technically I/O.

But I don't think, I could drive a PWM-signal with the facilities of
<stdio.h>. ;)


Vinzent.

-- 
A C program is like a fast dance on a newly waxed dance floor by people carrying
razors.
   --  Waldi Ravens

In message <op.vvzziadwlzeukk@jellix.jlfencey.com>, Vinzent Hoefler
<0439279208b62c95f1880bf0f8776eeb@t-domaingrabbing.de> writes
>Chris H wrote:
>
>> All systems MISRA is aimed at have IO... It is just that most don't have
>> screens.
>
>Depends on what you count as I/O. Of course, any electric wire going in or
>out the MCU are technically I/O.

They are IO... not just "technically" comparatively few computers have
screens.

>But I don't think, I could drive a PWM-signal with the facilities of
><stdio.h>. ;)

printf is essential :-)

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Stefan Reuther wrote:

> Vinzent Hoefler wrote:
>
>> Maybe original MISRA wasn't intended for systems which even had I/O. ;)
>
> Indeed, many of the rules make much more sense if you have an engine
> control unit in mind, not an infotainment device with a megapixel screen
> and a few Gigs of flash.

I see. It sure is a very critical device, so that restricting the developers
to use a safety-critical language subset saves a lot of money. ;)

Not like that stupid airbag that nobody's gonna need anyway.


Vinzent.

-- 
A C program is like a fast dance on a newly waxed dance floor by people carrying
razors.
     --  Waldi Ravens