Hi lilian just so you know, this email reach me as spam instead of usual inbox. Regards
On Wed, May 28, 2025, 11:18 Lilian Besson <lilian.bes...@crans.org> wrote: > Hello, > > Just to let you know, I've worked on this on my own last Saturday, and > I've almost managed to port TCC to the NumWorks: > https://github.com/Naereen/A-C-Compiler-for-the-NumWorks-calculator > > I've had to modify a bit the source code of tinycc.git/ to build a > arm-eabihf-libtcc.a static library. > I wasn't able to build it without modifying the main Makefile, so I did > that (on my fork, see > > https://github.com/Naereen/tinycc/commit/9802ebdebe7c7a8018083517225e8b3d1d193682#diff-76ed074a9305c04054cdebb9e9aad2d818052b07091de1f20cad0bbac34ffb52R18-R295 > if someone is curious about the changes). > > My embedded version of TCC starts by working well, until it calls on > tcc_compile_string(tcc_state, code_to_execute) > See > https://github.com/Naereen/A-C-Compiler-for-the-NumWorks-calculator/issues/2#issuecomment-2908695111 > > The error is almost certainly an error on the memory allocation process. > > I've tried to use the newlib's realloc() function, or a manually written > malloc/realloc/free (handling the heap manually, on a static array, just to > try). > Both approaches fail when tcc_compile_string(...) starts to ask for some > larger chunks of heap memory. > > It might be because of RAM fragmentation, or simply (sadly) because the > embedded system of the NumWorks calculator, which has no more than 256K of > Static RAM. > > > If anyone is interested into a discussion about this project, and mainly > on how to pinpoint and try to fix this error cause by memory allocation, I > would gladly discuss over email in English and/or French. > Many thanks in advance, > > Kind regards, > -- > Lilian Besson, > Professor of Computer Science at Lycée Kléber, in Strasbourg (France) > web : https://Besson.link/ ; phone : +33628412257 > email. : lil...@besson.link or lilian.bes...@crans.org > > > Le 24/05/2025 à 11:29, Lilian Besson a écrit : > > Hello dear developers and maintainers of TCC, > > > > I've started to be interested into trying to port the TCC compiler on a > graphical calculator, the ones manufactured by NumWorks (a French startup). > > > > NumWorks calculators use ARM micro-controllers (specifically, STM32 > micro-controllers). > > As stated by the manufacturer: This chip combines an ARMv7-M Cortex-M7 > core, clocked at 216 MHz and 256K of Static RAM. > > (see > https://www.numworks.com/engineering/hardware/electrical/parts/#stm32f730v8t6 > if needed) > > > > I'm trying to understand on my own how I need to use TCC's `configure` > and `make` commands, in order to produce a few files like libtcc.c/libtcc.h. > > I would like to embed the awesome TCC's "load, compile & run" features, > in a C application for this NumWorks calculator. > > > > I have an app that reads a file locally edited on the calculator, and > runs it on a Lua interpreter (or JavaScript), and the calculator ships with > MicroPython already working well. > > My goal is to offer the same kind of features but for a C program, which > could be edited on the calculator, read and ran by the "TCC interpreter" > application. > > > > # Here are a few questions: > > > > > > 1. how to use libtcc on an embedded ARM 32bits micro-controller? > > > > If I follow the ideas of the libtcc_test.c file ( > https://github.com/Tiny-C-Compiler/tinycc-mirror-repository/blob/mob/tests/libtcc_test.c), > will it work directly if I cross-compile the resulting C program to my > ARMv7-M CPU > > architecture for my NumWorks calculator? > > > > I see in the libtcc.c file that there is an option TCC_TARGET_ARM, so I > should enable it, include libtcc.h and "that's it" ? > > ( > https://github.com/Tiny-C-Compiler/tinycc-mirror-repository/blob/b6a16e3be4aff2d6b6e4870a1fde5e83707e9be4/libtcc.c#L36C22-L36C22 > ) > > > > > > 2. Is there any documentation I can follow, by any chance? Regarding any > of these questions. > > > > > > 3. Does anybody already tried such a thing, for instance for Texas > Instrument or Casio calculators? > > > > I saw that someone did port the GTC C compiler about 13 years ago, for > Texas Instrument calculators, but I don't find any other mentions. > > (here https://tiplanet.org/forum/archives_voir.php?id=1000) > > > > > > Kind regards, and thanks in advance; > > _______________________________________________ > Tinycc-devel mailing list > Tinycc-devel@nongnu.org > https://lists.nongnu.org/mailman/listinfo/tinycc-devel >
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