PBMS_X_SENSORS
#define PBMS_SENSORS (PBMS_X_SENSORS + PBMS_Y_SENSORS)
KASSERT(0 <= sc->sc_x_sensors && sc->sc_x_sensors <= PBMS_X_SENSORS);
to[PBMS_X_SENSORS + i] = from[j];
to[PBMS_X_SENSORS + i + 1] = from[j + 1];
y_det = detect_pos(sc->sc_acc + PBMS_X_SENSORS, sc->sc_y_sensors,