DRBL_BUS_CHANGE
while (isr_status & (DRBL_BUS_CHANGE | DRBL_EVENT_NOTIFY)) {
if (isr_status & DRBL_BUS_CHANGE) {
isr_status &= ~(DRBL_BUS_CHANGE);
if (mhba->isr_status & (DRBL_BUS_CHANGE | DRBL_EVENT_NOTIFY))