what different from PORT BUILTIN

[fkeujjpdc]

Code: Select all

MICROPY_PORT_BUILTIN_MODULES   MICROPY_PORT_BUILTIN_MODULE_WEAK_LINKS   MICROPY_PORT_CONSTANTS

these three marco is seems same,why split three marco ,What are the details they different。
if i want export a class or function,which marco is better for me.

[dhylands]

MICROPY_PORT_BUILTIN_MODULES is used to define builtin modules. modules included in this will be located when you do import module_name.

MICROPY_PORT_BUILTIN_MODULE_WEAK_LINKS is used to define weak links. In the stmhal port, for example weak links ubinascii to binascii. This allows 2 things. 1 - You can use import binascii and if there is no binascii module otherwise then it will import ubinascii instead. 2 - The u modules are micro-modules and don't include the full functionality of a module. Often times, the missing functionality can be implemented in python. By using weak links, it allows a python module names binascii to be implemented, this overriding the weak-link.

MICROPY_PORT_CONSTANTS defines constants that the parser will substitute with the real object.

So all 3 serve very distinct purposes.

[fkeujjpdc]

thanks for your patience ,i got it