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Groups > comp.arch.embedded > #27277
| From | David Brown <david.brown@hesbynett.no> |
|---|---|
| Newsgroups | comp.arch.embedded |
| Subject | Re: Embedded platforms for beginners? |
| Date | 2017-09-08 13:24 +0200 |
| Organization | A noiseless patient Spider |
| Message-ID | <ootulp$bne$1@dont-email.me> (permalink) |
| References | (13 earlier) <xINrB.1133730$nU3.966125@fx43.am4> <keednQXhXOCTfizEnZ2dnUU7-bGdnZ2d@supernews.com> <%RrsB.778646$cS2.338696@fx19.am4> <ootq5h$hco$1@dont-email.me> <lsusB.1240131$WI6.154044@fx30.am4> |
On 08/09/17 12:40, Tom Gardner wrote:
> On 08/09/17 11:07, David Brown wrote:
>> On 08/09/17 09:42, Tom Gardner wrote:
>>> On 08/09/17 01:23, Phil Hobbs wrote:
>>>> On 09/06/2017 03:45 AM, Tom Gardner wrote:
>>
>>>>> As for MCU/memory not being a cost driver, that means
>>>>> they no longer preclude GC.
>>>>
>>>> The primary thing that precludes GC in my embedded projects is me.
>>
>> My main reasoning for not using garbage collection, is that my code does
>> not generate garbage :-)
>
> Lucky you; usually my code /is/ garbage :)
>
>>> And that's an incontestable reason :)
>>>
>>> Personally I've never included GC in my embedded projects
>>> (although I use it everywhere else). But my reason is
>>> different: I'm interested in the /hard/ realtime behaviour.
>>>
>>> That frequently makes it difficult for me to include things
>>> like caches and interrupts. Fortunately there /are/ alternatives.
>>>
>>
>> Usually in that kind of project, you are avoiding dynamic memory and not
>> using any kind of malloc/free equivalent.
>
> Agreed, although I don't object to using malloc
> during startup.
Yes, that's fair enough (though I prefer static allocation when possible
- it makes it easier to see memory usage in map files. And for less
capable microcontrollers, it can be more efficient).
I have used systems where the malloc/free system is implemented as
something like :
static uint8_t heap[HEAP_SIZE];
static uint8_t * heapPointer;
void * malloc(size_t size) {
if ((&heap[HEAP_SIZE] - heapPointer) < size) {
die_horribly();
}
uint8_t * p = heapPointer;
heapPointer += size;
return p;
}
void free(void * ptr) {
die_horribly();
}
>
> I've always liked (and usually been able to achieve)
> almost complete separation between the hard realtime
> code and the "other stuff". Frequently the "other stuff"
> is coded in whatever is convenient, which usually
> includes GC.
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Embedded platforms for beginners? Elof Huang <elof.huang@runbox.com> - 2017-09-01 14:07 +0800
Re: Embedded platforms for beginners? Jack <jack4747@gmail.com> - 2017-08-31 23:22 -0700
Re: Embedded platforms for beginners? rickman <gnuarm@gmail.com> - 2017-09-01 04:10 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-01 21:49 +1000
Re: Embedded platforms for beginners? Elof Huang <elof.huang@runbox.com> - 2017-09-02 11:57 +0800
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-02 18:25 +1000
Re: Embedded platforms for beginners? Elof Huang <elof.huang@runbox.com> - 2017-09-03 15:37 +0800
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-03 17:54 +1000
Re: Embedded platforms for beginners? rickman <gnuarm@gmail.com> - 2017-09-03 13:49 -0400
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-02 11:41 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-03 09:44 +1000
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-02 20:39 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-03 11:16 +1000
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-02 18:21 -0700
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-03 14:26 +1000
Re: Embedded platforms for beginners? rickman <gnuarm@gmail.com> - 2017-09-03 02:14 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-03 17:52 +1000
Re: Embedded platforms for beginners? rickman <gnuarm@gmail.com> - 2017-09-03 13:50 -0400
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-03 22:20 -0700
Re: Embedded platforms for beginners? rickman <gnuarm@gmail.com> - 2017-09-05 22:06 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-06 12:21 +1000
Re: Embedded platforms for beginners? rickman <gnuarm@gmail.com> - 2017-09-05 22:42 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-06 14:26 +1000
Re: Embedded platforms for beginners? rickman <gnuarm@gmail.com> - 2017-09-06 01:20 -0400
Re: Embedded platforms for beginners? George Neuner <gneuner2@comcast.net> - 2017-09-03 15:58 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-04 08:00 +1000
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-03 19:13 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-04 09:58 +1000
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-03 20:16 -0400
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-04 15:13 +1000
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-03 22:24 -0700
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-04 15:55 +1000
Re: Embedded platforms for beginners? David Brown <david.brown@hesbynett.no> - 2017-09-05 14:15 +0200
Re: Embedded platforms for beginners? George Neuner <gneuner2@comcast.net> - 2017-09-05 12:35 -0400
Re: Embedded platforms for beginners? Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2017-09-05 10:02 -0700
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-05 18:13 +0100
Re: Embedded platforms for beginners? David Brown <david.brown@hesbynett.no> - 2017-09-06 10:24 +0200
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-05 17:10 -0700
Re: Embedded platforms for beginners? David Brown <david.brown@hesbynett.no> - 2017-09-06 09:57 +0200
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-05 16:57 -0700
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-05 16:54 -0700
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-06 12:31 +1000
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-05 19:42 -0700
Re: Embedded platforms for beginners? David Brown <david.brown@hesbynett.no> - 2017-09-05 10:16 +0200
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-05 16:56 -0400
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-04 10:46 +0100
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-05 17:09 -0400
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-05 19:35 -0700
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-06 12:40 +1000
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-06 00:42 -0400
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-06 08:55 +0100
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-06 08:45 +0100
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-07 20:23 -0400
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-08 08:42 +0100
Re: Embedded platforms for beginners? David Brown <david.brown@hesbynett.no> - 2017-09-08 12:07 +0200
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-08 11:40 +0100
Re: Embedded platforms for beginners? David Brown <david.brown@hesbynett.no> - 2017-09-08 13:24 +0200
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-08 13:36 +0100
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-09 13:16 -0400
Re: Embedded platforms for beginners? Les Cargill <lcargill99@comcast.com> - 2017-09-10 08:53 -0500
Re: Embedded platforms for beginners? Dimiter_Popoff <dp@tgi-sci.com> - 2017-09-10 20:18 +0300
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-11 21:24 -0400
Re: Embedded platforms for beginners? Les Cargill <lcargill99@comcast.com> - 2017-09-15 22:22 -0500
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-18 11:26 -0400
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-18 18:26 +0100
Re: Embedded platforms for beginners? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-09-19 14:27 -0400
Re: Embedded platforms for beginners? Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-09-18 18:24 +0100
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-03 22:30 -0700
Re: Embedded platforms for beginners? Clifford Heath <no.spam@please.net> - 2017-09-04 15:51 +1000
Re: Embedded platforms for beginners? Paul Rubin <no.email@nospam.invalid> - 2017-09-03 22:04 -0700
Re: Embedded platforms for beginners? kristoff <kristoff@skypro.be> - 2017-09-05 17:56 +0200
Re: Embedded platforms for beginners? Luke A. Guest <laguest@archeia.com> - 2017-09-10 17:10 +0100
Re: Embedded platforms for beginners? tarjei99@gmail.com - 2017-09-10 05:49 -0700
Re: Embedded platforms for beginners? Les Cargill <lcargill99@comcast.com> - 2017-09-10 09:03 -0500
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