Function timer_group_get_intr_status_in_isr 

pub unsafe extern "C" fn timer_group_get_intr_status_in_isr(
    group_num: timer_group_t,
) -> u32

@brief Get interrupt status, just used in ISR

@param group_num Timer group number, 0 for TIMERG0 or 1 for TIMERG1

@return - Interrupt status