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Re: Static JSON parser for embedded

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On 19-05-19 02:12 , Clifford Heath wrote:
> On 19/5/19 12:03 am, pozz wrote:
>> Il 18/05/2019 09:14, Clifford Heath ha scritto:
>>> ...
>>> The European Space Agency has followed the lead of the ISO networking
>>> standards and built a compiler for ASN.1, which emits C code targeted
>>> at static-memory embedded systems.

(By the way, it emits Ada code too.)

  [snip]

>>> The ESA-funded ASN1CC is here: <https://github.com/ttsiodras/asn1scc>.
>>>
>  [snip]
 >
> This one is [snip] used for the majority
> of inter-module communications on ESA space missions,

Are you sure about that usage? I have been implementing on-board SW for 
ESA missions since 1995 or so, and I have never come across a system 
using ASN.1 or the ASN1SCC tool. There may be such, and there may be 
more in the future, but I doubt they can be in the majority now.

Perhaps you are confusing the ASN1SCC tool with the specific 
packet-based protocol (specific grammar, in other words) that is used by 
the majority of ESA missions now: the Packet Utilization Standard (PUS)? 
As I understand it, the ASN1SCC tool was implemented fairly recently to 
help with future SW implementations of PUS and similar packet-structure 
standards.

Of course this point is not very important for the OP, but it would 
interest me greatly if you can point to some ESA missions that use ASN1SCC.

(More off-topic: several years ago I heard a very negative opinion about 
the ASN.1 metalanguage from a senior colleague who was an expert in 
formal grammars and meta-compilers. He felt that the committee that 
defined ASN.1 had done so on an "amateur" level without properly using 
the metalanguage technology already well known in the computer science 
domain.)

(Even more off topic: IMO the intrusion into ESA of ITU working methods 
for standards has generally resulted in a drastic decrease in the 
usability of the ESA/ECSS standard documents (although not in the 
standards themselves). The volume of text and the number of identified 
requirements has increased hugely for purely formal reasons, without a 
corresponding increase in the scope of the standards. This applies in 
particular to the PUS, when one compares the original standard (PUS A) 
with the current one (PUS C).)

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
       .      @       .

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Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-05-19 09:12 +1000
  Re: Static JSON parser for embedded Niklas Holsti <niklas.holsti@tidorum.invalid> - 2019-05-19 17:13 +0300
    Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-05-20 09:25 +1000
  Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-06-06 11:12 +0200
    Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-06-07 09:11 +1000
      Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-06-07 08:59 +0200
        Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-06-12 09:41 +1000

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