Is there any current documentation for "external c modules"? #17437
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I want to add an external C based module and started with the documentation found at MicroPython external C modules. It is good as a starting point but lacks of any in depth documentation. After looking around I found the micropython-usermod’s documentation. Unfortunately, when trying to add a class I realized that this seems to be outdated. Where to find an up-to-date documentation available related to the external C modules? |
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Replies: 1 comment 3 replies
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Unfortunately, there isn't much documentation available. To get a deeper understanding, you just need to read the code. You may also find the files under "micropython/examples/usercmodule" helpful. This URL, https://mpy-c-gen.oliverrobson.tech/, may be useful for writing the C stub. I hope these are still accurate. You might also find my repository, https://github.com/shariltumin/c-module-tutorial-micropython, helpful. |
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Thanks for the hints. My main concern is how a add a new class? The stubs generator generates the stubs for functions only, but not for generating members of a class. According the old Working with class documentation, e.g. you provide the "print" member function like this: const mp_obj_type_t modcapa_two_pin_capa_sensor_type = {
{ &mp_type_type },
.name = MP_QSTR_modcapa,
.print = two_pin_capa_sensor_print,
.make_new = two_pin_capa_sensor_make_new,
.locals_dict = (mp_obj_dict_t*)&two_pin_capa_sensor_locals_dict,
};But the structure of the It looks like that the struct was replaced by the new slot based variant in commit cb0ffdd. struct _mp_obj_type_t {
...
// Corresponds to __repr__ and __str__ special methods.
- mp_print_fun_t print;
+ uint8_t slot_index_print;Is there any good candidate to look into, to derive on how to use this new mechanism? |
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@poWer4aiX check micropython/extmod/modsocket.c Line 530 in 5f058e9 static MP_DEFINE_CONST_OBJ_TYPE(
socket_type,
MP_QSTR_socket,
MP_TYPE_FLAG_NONE,
make_new, socket_make_new,
protocol, &socket_stream_p,
locals_dict, &socket_locals_dict,
print, socket_print
);the new way is using this |
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@Carglglz, perfect, thanks a lot for this hint, could easily adapt my code which is working now. |
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@poWer4aiX check
micropython/extmod/modsocket.c
Line 530 in 5f058e9
the new way is using this
MP_DENIFE_CONST_OBJ_TYPEmacro function 👍🏼