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Re: Embedded Scripting -- Tcl? Lua? Thoughts? Suggestions?

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.arch.embedded
Subject Re: Embedded Scripting -- Tcl? Lua? Thoughts? Suggestions?
Date 2015-03-13 22:29 -0700
Organization A noiseless patient Spider
Message-ID <87mw3g5eqm.fsf@nightsong.com> (permalink)
References <kdCdnY1enJGty57InZ2dnUU7-VOdnZ2d@giganews.com> <87y4n05kvj.fsf@nightsong.com> <hKSdnRD7kPOFKp7InZ2dnUU7-dWdnZ2d@giganews.com>

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Tim Wescott <tim@seemywebsite.com> writes:
> I'm trying to stick with an ARM M4 cored processor that has 256kB to 
> 512kB of flash, and maybe 64kB of RAM, and a 72MHz CPU speed. 

Hmm, ok, I think Javascript is not practical in something that small.
Lua can work but will be a little bit cramped.  How much of that flash
and ram will actually be available to Lua (i.e. not needed by the
non-Lua code)?  How complicated do you expect the scripts to be?  Are
you ok with cross-compiling the scripts?  That means loading a script by
compiling it to bytecode with a PC application, then loading the
bytecode to your embedded board, instead of including the compiler in
the board so you can talk to it with a terminal.

http://wiki.eluaproject.net/FAQ#minimumrequirements

has some info.  TCL (especially old versions) is probably smaller.  I
know there are some bigger Cortex M4 parts, like ST has one with 2MB of
flash and 256k of ram -- do they cost too much or something?

> I'll consider Javascript for that very reason, particularly if I can
> find an open- source interpreter that seems serious and
> well-supported.

You'd have to use a bigger processor, but it still may be worth it.  I
worked on something a couple years ago that could have been done in C on
an 8 bitter, but we used an embedded ARM7/Linux system with 64 meg of
ram for development convenience, adding maybe $5 to the hardware BOM
which was acceptable for what we were doing.  I think it was well
justified by the flexibility it gave us.  We were able to ship a better
product faster.

I don't know anything about JS embeddability.  I've only programmed it
at the application level.  I know that various applications other than
web browsers do embed JS, but it may be a lot more complicated than
using Lua.

Will your scripts have to process much non-numeric data like strings and
complicated structures?  If not, maybe there's some BASIC dialect that
your users would find comfortable, especially if they're hardware types
who have been around for a while.

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Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Tim Wescott <seemywebsite@myfooter.really> - 2015-03-13 16:27 -0500
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-13 15:03 -0700
    Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Tim Wescott <seemywebsite@myfooter.really> - 2015-03-13 19:04 -0500
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? rickman <gnuarm@gmail.com> - 2015-03-18 02:34 -0400
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul E Bennett <Paul_E.Bennett@topmail.co.uk> - 2015-03-18 12:37 +0000
    Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Tim Wescott <seemywebsite@myfooter.really> - 2015-03-13 19:06 -0500
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-13 18:14 -0700
  Re: Embedded Scripting -- Tcl? Lua? Thoughts? Suggestions? Tom Gardner <spamjunk@blueyonder.co.uk> - 2015-03-13 22:30 +0000
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? David Brown <david.brown@hesbynett.no> - 2015-03-14 00:48 +0100
    Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul Rubin <no.email@nospam.invalid> - 2015-03-13 19:45 -0700
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? David Brown <david.brown@hesbynett.no> - 2015-03-15 23:01 +0100
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? mroberds@att.net - 2015-03-14 00:28 +0000
    Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-13 18:45 -0700
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Clifford Heath <no.spam@please.net> - 2015-03-14 13:14 +1100
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-13 20:35 -0700
          Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-14 23:59 -0400
            Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-14 22:30 -0700
              Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-15 21:44 -0400
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-15 20:09 -0700
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-14 23:59 -0400
          Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-16 15:42 -0700
            Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-17 04:25 -0400
              Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-17 10:39 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-17 17:06 -0400
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-17 19:36 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-18 01:50 -0400
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-17 23:32 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Robert Wessel <robertwessel2@yahoo.com> - 2015-03-18 05:30 -0500
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-18 10:32 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Robert Wessel <robertwessel2@yahoo.com> - 2015-03-18 16:11 -0500
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-18 18:26 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-19 02:09 -0400
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-19 12:04 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-19 17:52 -0400
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-19 15:44 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-20 02:38 -0400
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? David Brown <david.brown@hesbynett.no> - 2015-03-20 10:05 +0100
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-20 02:51 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? David Brown <david.brown@hesbynett.no> - 2015-03-20 11:49 +0100
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-20 05:12 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? David Brown <david.brown@hesbynett.no> - 2015-03-20 14:55 +0100
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-20 15:07 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-20 14:11 -0400
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-20 15:20 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-22 09:28 -0400
                OT:  EoL Don Y <this@is.not.me.com> - 2015-03-22 12:19 -0700
                Re: OT:  EoL Reinhardt Behm <rbehm@hushmail.com> - 2015-03-23 07:30 +0800
                Re: OT:  EoL Don Y <this@is.not.me.com> - 2015-03-22 17:19 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-20 02:12 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Mel Wilson <mwilson@the-wire.com> - 2015-03-20 13:24 +0000
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-20 10:20 -0700
                Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-22 08:12 -0400
                OT: senses Don Y <this@is.not.me.com> - 2015-03-22 13:53 -0700
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Wouter van Ooijen <wouter@voti.nl> - 2015-03-15 10:11 +0100
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? mroberds@att.net - 2015-03-14 07:50 +0000
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Mel Wilson <mwilson@the-wire.com> - 2015-03-14 12:24 +0000
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Don Y <this@is.not.me.com> - 2015-03-14 11:46 -0700
          Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-14 23:58 -0400
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Clifford Heath <no.spam@please.net> - 2015-03-14 12:59 +1100
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul Rubin <no.email@nospam.invalid> - 2015-03-13 20:16 -0700
    Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Tim Wescott <tim@seemywebsite.com> - 2015-03-13 23:20 -0500
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul Rubin <no.email@nospam.invalid> - 2015-03-13 22:29 -0700
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul Rubin <no.email@nospam.invalid> - 2015-03-13 22:46 -0700
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Stefan Reuther <stefan.news@arcor.de> - 2015-03-14 11:02 +0100
    Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Anders.Montonen@kapsi.spam.stop.fi.invalid - 2015-03-16 11:37 +0000
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul Rubin <no.email@nospam.invalid> - 2015-03-16 13:53 -0700
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Robert Wessel <robertwessel2@yahoo.com> - 2015-03-14 03:16 -0500
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-14 10:27 +0200
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul E Bennett <Paul_E.Bennett@topmail.co.uk> - 2015-03-14 08:43 +0000
    Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-14 13:55 +0200
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul E Bennett <Paul_E.Bennett@topmail.co.uk> - 2015-03-14 12:14 +0000
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? stephen@mpeforth.com (Stephen Pelc) - 2015-03-14 18:04 +0000
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-14 23:14 +0200
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Allan Herriman <allanherriman@hotmail.com> - 2015-03-14 10:08 +0000
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-15 00:55 -0400
    Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul Rubin <no.email@nospam.invalid> - 2015-03-14 22:20 -0700
      Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? George Neuner <gneuner2@comcast.net> - 2015-03-15 20:35 -0400
        Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Paul Rubin <no.email@nospam.invalid> - 2015-03-15 18:47 -0700
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? stephen@mpeforth.com (Stephen Pelc) - 2015-03-18 10:03 +0000
  Re: Embedded Scripting -- Tcl?  Lua?  Thoughts?  Suggestions? Matthias Koch <matthias.koch@hot.uni-hannover.de> - 2015-03-19 12:02 +0100

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