fixed schematics @ canon managing, add initialization for absolute positioning, TODO: add CAN bus management

F1:F103/Canon_managing_device/usb.c

@@ -79,6 +79,9 @@ static void receive_Handler(){ // EP2OUT
 }
 
 void usb_proc(){
+    if(CAN1->RF0R & CAN_RF0R_FOVR0){ // FIFO overrun
+        CAN1->RF0R &= ~CAN_RF0R_FOVR0;
+    }
     switch(USB_Dev.USB_Status){
         case USB_STATE_CONFIGURED:
             // make new BULK endpoint