lv_subject_add_observer_with_target() is only used within i80_controller sample.
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lv_subject_add_observer_with_target() function
Add an observer to a subject and also save a target.
Syntax
lv_observer_t * lv_subject_add_observer_with_target(lv_subject_t * subject,
lv_observer_cb_t observer_cb,
void * target,
void * user_data);
Implemented in ![]()
lv_observer.c:336
Return value
pointer to the created observer