carl9170_set_state_when
carl9170_set_state_when(ar, CARL9170_IDLE, CARL9170_STARTED);
carl9170_set_state_when(ar, CARL9170_STARTED, CARL9170_IDLE);
carl9170_set_state_when(ar, CARL9170_STARTED, CARL9170_IDLE);
carl9170_set_state_when(ar, CARL9170_STOPPED, CARL9170_IDLE);
carl9170_set_state_when(ar, CARL9170_IDLE, CARL9170_STOPPED);
carl9170_set_state_when(ar, CARL9170_STOPPED, CARL9170_IDLE);