Register frequency meter callback.
int32_t freqmeter_async_register_callback( struct freqmeter_async_descriptor *const descr, const enum freqmeter_async_callback_type type, freqmeter_cb_t cb )
Type: struct freqmeter_async_descriptor Struct *const
A frequency meter descriptor
Type: const enum freqmeter_async_callback_type Enum
Callback type
Type: freqmeter_cb_t typedef
A callback function
Type: int32_t
The status of callback assignment.
Passed parameters were invalid or the interface is not initialized
A callback is registered successfully