How can I use eLua as embedded interpreter in my firmware ?
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Alexander Iovlev |
How can I use eLua as embedded interpreter in my firmware ?
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Hash: SHA1 Hello. I have a Texas Instruments lm3s5r31 microcontroller with a Cortex-M3 core. I already have the firmware (written in C) which runs on it. I want to use lua for embedded scripting as a part of my firmware. I don't need support for filesystem, shell, input-output and controller peripheral from scripts but I need to execute some firmware functions from scripts. How can I configure eLua for this purpose ? What does my firmware need to support eLua ? How much ram and flash memory do I need for eLua in this case ? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJR9lEpAAoJEGVXsYvfHzFn6t8H/3UN8uHwCUEZ05k7CqBwT6iM qX25oJHP7r3154S8VLUa41aGM4A2QJvAdK4JDfERnqNVlat1A/2xjxKfJNziDp4J L4OHBbQGj/3tO4M8zwNfxBBgwctp6dokCyxltSLwkVtXDc+kXrAqna4yo6qNN2fr XL28eTzJk8i5mM+7zPYGUZN8Kd+bnmeXUEPxu1xVvN6h6rdocCttkyyPwyfGTYp9 j87sAdSXI39R3DsvzsVDHU//3C50ApGWJHmiQS+Dg7Z3WDmWA+RMyzec4KV0plJ0 CQjaqoqSRSAY37VNv5ZpVG3wpsNK0BKRiOo7A7/fnDQgXgtvxSss6stdXxFiZjY= =mJeZ -----END PGP SIGNATURE----- _______________________________________________ eLua-dev mailing list [hidden email] https://lists.berlios.de/mailman/listinfo/elua-dev |
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Dear Alexander, > Hello. I have a Texas Instruments lm3s5r31 microcontroller with a I just had a quick look at the current (dev) state of the eLua code base. eLua currently doesn't support your device. So it cannot be compiled for your board right away. It requires a port but this should be fairly easy because eLua already runs on other Cortex M3 clones (including a few M3 clones from Texas Instruments). > Cortex-M3 core. I already have the firmware (written in C) which runs > on it. I want to use lua for embedded scripting as a part of my To access your C program from eLua, you'll have to write an eLua module. Please check link [1] for some information on this. You can also read this page [2] to understand the details of the Lua tiny RAM (LTR) patch for eLua modules. If you're looking for a quick solution for building an eLua module, you can try the eLua mode for SWIG [3]. It can be instructed to generate LTR compatible wrappers for your module. > firmware. I don't need support for filesystem, shell, input-output and > controller peripheral from scripts but I need to execute some firmware > functions from scripts. Once you have a port, this is an easy thing. You can configure the eLua image for your MCU according to your needs by modifying Lua scripts (which you'll have to write if you're doing a port for your target). Please check this file [4] for an example. Please note: If you're using elua0.9 (the current stable release), you have a different approach for configuring your eLua build. You must modify a file called platform_conf.h which can be found in this path: elua/src/platform/<platform name>/platform_conf.h So, unless you have a target/board which eLua already supports this approach will not be of much use to you. > How can I configure eLua for this purpose ? You can read about configuring the eLua image in the eLua doc. If you're using elua0.9 please check the old configuration method [5]. Else, you can check on how the configuration is done with Lua scripts [6]. > What does my firmware need to support eLua ? I'm not sure I understand this question well but if you're talking about compiling your program with eLua, then the answer is simple. If you're using gcc (or one of the C99 compliant toolchains that eLua uses and supports - like the codesourcery toolchain for ARM Cortex targets), you shouldn't have any problem using your C program with eLua. Have a lot fun with your board. Best, Raman Links: [1]: http://wiki.eluaproject.net/Tutorials/cmodules [2]: http://www.eluaproject.net/doc/v0.9/en_arch_ltr.html [3]: http://www.swig.org/Doc2.0/Lua.html [4]: https://github.com/elua/elua/blob/master/boards/known/ek-lm3s8962.lua [5]: http://www.eluaproject.net/doc/v0.8/en_building.html [6]: http://www.eluaproject.net/doc/master/en_configurator.html |
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In reply to this post by Alexander Iovlev
Hi Alexander,
On Mon, Jul 29, 2013 at 2:25 PM, Alexander Iovlev <[hidden email]> wrote: -----BEGIN PGP SIGNED MESSAGE----- eLua is not supported in this configuration (embeddable interpreter) out of the box, you'd probably need to hack around it quite a bit to make it work. Best, Bogdan
_______________________________________________ eLua-dev mailing list [hidden email] https://lists.berlios.de/mailman/listinfo/elua-dev |
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Tom Schouten |
Re: How can I use eLua as embedded interpreter in my firmware ?
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In reply to this post by Alexander Iovlev
This can be done using standard Lua.
Essentially, just copy the Lua sources into your code base and link it in the main binary. If your firmware has a full C library, most of the dependencies should be there. Once you link, you'll immediately see what is missing through undefined symbols. Then you can either decide to properly implement those functions, or replace them with dummies if you don't use them. Lua has a fairly small base when it comes to OS dependency. The big question is probably RAM usage. You'd really have to try to find out how it goes, though it will be tight. I did this integration process for eCos, but it only ever ran on the emulator (synthetic target), not a small uC. On 07/29/2013 07:25 AM, Alexander Iovlev wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hello. I have a Texas Instruments lm3s5r31 microcontroller with a > Cortex-M3 core. I already have the firmware (written in C) which runs > on it. I want to use lua for embedded scripting as a part of my > firmware. I don't need support for filesystem, shell, input-output and > controller peripheral from scripts but I need to execute some firmware > functions from scripts. > > How can I configure eLua for this purpose ? > > What does my firmware need to support eLua ? > > How much ram and flash memory do I need for eLua in this case ? > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.12 (GNU/Linux) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBAgAGBQJR9lEpAAoJEGVXsYvfHzFn6t8H/3UN8uHwCUEZ05k7CqBwT6iM > qX25oJHP7r3154S8VLUa41aGM4A2QJvAdK4JDfERnqNVlat1A/2xjxKfJNziDp4J > L4OHBbQGj/3tO4M8zwNfxBBgwctp6dokCyxltSLwkVtXDc+kXrAqna4yo6qNN2fr > XL28eTzJk8i5mM+7zPYGUZN8Kd+bnmeXUEPxu1xVvN6h6rdocCttkyyPwyfGTYp9 > j87sAdSXI39R3DsvzsVDHU//3C50ApGWJHmiQS+Dg7Z3WDmWA+RMyzec4KV0plJ0 > CQjaqoqSRSAY37VNv5ZpVG3wpsNK0BKRiOo7A7/fnDQgXgtvxSss6stdXxFiZjY= > =mJeZ > -----END PGP SIGNATURE----- > _______________________________________________ > eLua-dev mailing list > [hidden email] > https://lists.berlios.de/mailman/listinfo/elua-dev > _______________________________________________ eLua-dev mailing list [hidden email] https://lists.berlios.de/mailman/listinfo/elua-dev |
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