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whitecatboard / Lua-RTOS-ESP32

Lua RTOS for ESP32
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ldo support.. #405

Closed mgliewe closed 2 years ago

mgliewe commented 2 years ago

micropython supports (limited) loadable code.

mpy modules, compiled on host, may contain native code, loaded and relocated on runtime.

This could be a major feature for luartos as well? a major security issue as well, i suppose.

the0ne commented 2 years ago

As far as I remember, this is currently supported. It's not clear from your post: Do you want to discuss about it or use it?

the0ne commented 2 years ago

try this:

    local cmd = "your command here"
    print("now executing "..cmd)
    local function dostring (x) return assert(load(x), "")() end
    print(dostring(cmd))
mgliewe commented 2 years ago

a misunderstanding... i was refering to native code.

My usecase: i'm working on audio dsp processing. Its a modular system. I have some base modules (i2s audio source/sink, BT/a2dp yet to come) and a bunch of dsp modules, which can dynamically instantiated and routed. These dsp modules are generated by faust dsp [1], which takes a description of an audio filter in a functional language, and translates that into c code. These dsp modules might be effect filters, equalizers, echo, distortion... you name it. Basically the system is set to work simillar to guitarix [2] on linux, on a very limited scale.

Due to limited horsepower of the xtensa cores, tweaking and working on the dsp filters is most of the work. The turn-around cycles for esp code are a bit lengthly (work on source - rebuild - reflash - reboot), experimenting with c code tends to be a bit anoying.

Micropython addresses this by means of a custom linker [3], taking .o files in ELF format, linking them into a proprietary ldo format, and corresponding loader code inside the python core [4].

[1] https://faust.grame.fr/ [2] https://guitarix.org/ [3] https://github.com/micropython/micropython/blob/master/tools/mpy_ld.py [4] https://github.com/micropython/micropython/blob/master/py/persistentcode.c#L402

the0ne commented 2 years ago

My hint would be to check out the VM functions. I never used that and I don't know much about it, but if it's what I think then it might help you.