how to add a sub directory to compile?

[vernon]

Hello,
I want to have a sub directory into my project for compile?
following structure is from the example, I want to add a sub directory named my_module, how to add this sub directory for compiling? how to write the mk file under my_module directory?

../main
../...../main.c
../...../component.mk
../Makefile
../READ.me

../my_module
../............../module1.c
../............./module1.h
../............./component.mk

[Sprite]

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