Solved a bug in the comm_receive function: it returned succes when there was a timeout error.

comm/src/comm.c

@@ -126,6 +126,8 @@ comm_error comm_receive(TComm *dev,unsigned char *data,unsigned short int *lengt
         comm_cancel_dma_receive(dev);
       else
         comm_cancel_irq_receive(dev);
+      *length=0;
+      return error;
     }
   }
   // get the received data