+#endif
+
+ /* too slow (less than 1 tr/s) */
+ if (icr_cpt >= CPT_ICR_MAX)
+ return 1000L;
+
+ /* too fast (more than 100 tr/s) */
+ if (icr_cpt <= CPT_ICR_MIN)
+ return 100000L;
+
+ /* XXX test */
+ if (icr_cpt > 25)
+ return icr_cpt * 8192UL;
+
+ return TIM3_UNIT/icr_diff;