+# if defined(STM32F3xx_MCUCONF)
+# define wait_ms(ms) chSysPolledDelayX(MS2RTC(STM32_HCLK, (ms)))
+# define wait_us(us) chSysPolledDelayX(US2RTC(STM32_HCLK, (us)))
+# else
+# define wait_ms(ms) chThdSleepMilliseconds(ms)
+# define wait_us(us) chThdSleepMicroseconds(us)
+# endif