car_fmw: smooth stop, small fixes

car_fmw/src/Voyager.kt

@@ -1,9 +1,12 @@
 
 object Voyager {
     val VELOCITY_DRIVE: Double = 0.03 // centimeter in millisecond
-    val VEL0CITY_ROUTATE: Double = 0.001 // degree in millisecond
+    val VEL0CITY_ROUTATE: Double = 0.015 // degree in millisecond
     val SEGMENT_SIZE: Int = 30 // centimeter
 
+    val MAX_ANGLE: Int = 180 // degree
+    val ENGINE_DELAY: Int = 500 // milisecond
+
     fun run() {
         while (true) {
             var distance = Sonar.getDistance(0)
@@ -12,19 +15,25 @@ object Voyager {
                 distance = Sonar.getDistance(0)
             }
 
-            rotate(Random.getInt())
+            rotate(Random.getInt() % MAX_ANGLE)
         }
     }
 
     private fun rotate(degree: Int) {
-        val time = (degree.toDouble() / VELOCITY_DRIVE).toInt()
+        val duration = (degree.toDouble() / VELOCITY_DRIVE).toInt()
         Engine.left()
-        Time.wait(time)
+        Time.wait(duration)
     }
 
     private fun drive(direction: RouteType, distance: Int) {
-        val time = (distance.toDouble() / VELOCITY_DRIVE).toInt()
+        val duration = (distance.toDouble() / VELOCITY_DRIVE).toInt()
         Engine.drive(direction.id)
-        Time.wait(time)
+        Time.wait(duration)
+        smoothStop()
+    }
+
+    private fun smoothStop() {
+        Engine.stop()
+        Time.wait(ENGINE_DELAY)
     }
 }

car_fmw/src/include/Random.kt

@@ -1,6 +1,6 @@
 
-external fun car_random_int(): Int
+external fun car_random_get_int(): Int
 
 object Random {
-    fun getInt(): Int = car_random_int()
+    fun getInt(): Int = car_random_get_int()
 }

car_fmw/src/main.kt

@@ -10,7 +10,7 @@ fun main() {
     Leds.set(Leds.GREEN, true)
 
     /* car task */
-    Control.run()
+//    Control.run()
 
     /* Voyager */
     Voyager.run()