Oh, fucking shit! It's seems like it's works!!!

F3:F303/Multistepper/steppers.c

@@ -18,6 +18,7 @@
 
 #include "flash.h"
 #include "hardware.h"
+#include "pdnuart.h"
 #include "proto.h"
 #include "steppers.h"
 #include "strfunc.h"
@@ -82,6 +83,13 @@ void update_stepper(uint8_t i){
     accdecsteps[i] = (the_conf.maxspd[i] * the_conf.maxspd[i]) / the_conf.accel[i] / 2;
     ustepsshift[i] = MSB(the_conf.microsteps[i]);
     ESW_reaction[i] = the_conf.ESW_reaction[i];
+    switch(the_conf.motflags[i].drvtype){
+        case DRVTYPE_UART:
+            pdnuart_init(i);
+        break;
+        default:
+        break;
+    }
 }
 
 // run this function after each steppers parameters changing