4b52003fb8
Both the direction and the Pin used for ref_clk can now be configured. It Requires at least idf v4.4. The new keyword arguments to the constructor are: - ref_clk_mode=mode: with mode being Pin.IN or Pin.OUT. If it is not set, then the default configuration is used, which may be configured by kconfig settings. - ref_clk=pin_obj: which defines the Pin used for ref_clk. This is either Pin(0), Pin(16) or Pin(17). No check is done for the pin number. If it is the wrong one, it simply will not work. Besides that, no harm.