Function esp_idf_sys::ets_update_cpu_frequency_rom

pub unsafe extern "C" fn ets_update_cpu_frequency_rom(ticks_per_us: u32)

@brief Set the real CPU ticks per us to the ets, so that ets_delay_us will be accurate.

@note This function only sets the tick rate for the current CPU. It is located in ROM, so the deep sleep stub can use it even if IRAM is not initialized yet.

@param uint32_t ticks_per_us : CPU ticks per us.

@return None