if (last_qtr_frame < which_quarter_frame) {
_mtc_running = MTC_Forward;
} else if (last_qtr_frame > which_quarter_frame) {
_mtc_running = MTC_Backward;
}
if (last_qtr_frame < which_quarter_frame) {
_mtc_running = MTC_Forward;
} else if (last_qtr_frame > which_quarter_frame) {
_mtc_running = MTC_Backward;
}