ESP32 Forum

Hello all,

In esp32-hal-cpu.h there is a line

typedef void (* apb_change_cb_t) (void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb);

I am having trouble understanding what this means. What I think I do understand is this is the way to change the apb rate.
and it returns a pointer to a call back type. So anytime you change the apb rate it will also execute a callback ?

Maybe some of you real programmers can help me out.

Thanks in advance

I think it is for signalling hardware in the hal that need to know when the apb frequency changes. If you want to change the system frequency, use setCpuFrequencyMhz().

Based on this declaration how would I call it from my program.