lvgl v9.2.0 support broken.

[andrewleech]

I've attempted to build against LVGL v9.2.0 and while it compiles, I get an error thrown at runtime from code like:

def HomeBtnBlockB_eventhandler(event_struct):
   event = event_struct.code
   if event == lv.EVENT.CLICKED and True:
      print("clicked")

ui_HomeBtnBlockB = lv.imagebutton(ui_Home)
ui_HomeBtnBlockB.add_event_cb(HomeBtnBlockB_eventhandler, lv.EVENT.ALL, None)

The add_event_cb() function throws:

Traceback (most recent call last):
  File "app.py", line 23, in <module>
  File "lvgl/demo1/export/ui.py", line 227, in <module>
SyntaxError: Cannot convert 'function' to pointer!

In the generated lv_mpy.c the error is thrown by:

event_cb = mp_to_ptr() won't accept a function, the exception is thrown from

lv_binding_micropython/gen/gen_mpy.py

Line 1355 in 96d6d35

&mp_type_SyntaxError, MP_ERROR_TEXT("Cannot convert '%s' to pointer!"), mp_obj_get_type_str(self_in)));

I've bisected lvgl and narrowed down this change in behavior to lvgl/lvgl@1d14386b
Before this it works fine.

[Carglglz]

See https://github.com/lvgl/lvgl/blob/master/docs/CHANGELOG.rst#breaking-changes, I had similar problems but I've just updated lv_conf.h in my branch 6a5eb88 and it seems to work now 👍🏼 (cc @Lzw655)

[Lzw655]

Hi @andrewleech @Carglglz, thank you very much for your efforts! I tested the branch 6a5eb88, and it indeed resolves this issue. 👍

[andrewleech]

I've integrated the fix into #242 as well so consider this resolved thanks.