without the initial function, CCGx will not sync interrupt handler. Which is means there is no response for any interrupt occurred.
I search complete project for "pd_hal_init" but can't trace which module is calling this API.
So you said, its basic/API must be called.
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Its being called from one of the libraries. In the following SDK: CCGx SDK v3.0.2, it is called from the libccgx_pd3.a.
Hope this answers your question.