使用互斥锁调用单独的任务nXc

时间:2015-09-21 16:16:43

标签: nxc

我很高兴使用nXc编码我的NXT 2.0机器人,我需要它来跟随其他机器人并同时检查障碍物。然而,这两项任务有时会相互冲突,当我遇到一个障碍时,它会将其视为一个对象并继续前进而不是停止。

我的项目目标:跟随领导机器人,遇到障碍物时停下来,在障碍物清除后,继续跟随前方的领导机器人。

以下是我的代码:

    #define NEAR 50
    #define TURNTIME 540
    #define MOVETIME 1000

    mutex moveMutex;

    //check for robot in front of it
    task check_robot(void)
    {
         while(true)
         {
             if (SensorUS(IN_2)<=NEAR)
             {
                 Acquire(moveMutex);
                 OnFwd(OUT_BC,50);  //if it is within range of 50cm, move
                 Release(moveMutex);
             }
             if (SensorUS(IN_2)>NEAR)
             {
                 Acquire(moveMutex);  //this section allows the robot to turn
                 OnFwd(OUT_C,50);     //left and right to look for the 
                 Wait(TURNTIME);      //leader
                 OnRev(OUT_B,50);
                 Wait(TURNTIME);
                 OnRev(OUT_C,50);
                 Wait(TURNTIME);
                 OnFwd(OUT_B,50);
                 Wait(TURNTIME);
                 if (SensorUS(IN_2)<=NEAR)
                 {
                      Acquire(moveMutex);
                      OnFwd(OUT_BC,50);   //if it finds the leader, it moves
                      Release(moveMutex);
                 }
                 else
                 {
                      Acquire(moveMutex);
                      OnFwd(OUT_C,50);       //repeats the search process
                      Wait(TURNTIME);
                      OnRev(OUT_B,50);
                      Wait(TURNTIME);
                      OnRev(OUT_C,50);
                      Wait(TURNTIME);
                      OnFwd(OUT_B,50);
                      Wait(TURNTIME);
                      Release(moveMutex);
                 }
             }
             Release(moveMutex);
         }
    }

    task check_obstacles(void)
    {
         Acquire(moveMutex);
         until(((SENSOR_1)==1)||((SENSOR_3)==1));   //when any one of the
         OnRev(OUT_BC,50);                          //touch sensors are
         Wait(1000);                                //pressed, it is supposed
         Off(OUT_BC);                               //to stop until both
         until(((SENSOR_1)==0)&&((SENSOR_3)==0));   //are released, then
         OnFwd(OUT_BC,50);                          //continue moving
         Release(moveMutex);
    }

    task main(void)
    {
         SetSensorTouch(IN_1);
         SetSensorUltrasonic(IN_2);
         SetSensorTouch(IN_3);
         SetSensorColorFull(IN_4);

         while(true)
         {
             Precedes(check_robot,check_obstacles);
         }
    }

有关如何改善这一点的任何想法?使用子程序而不是任务会更好吗?使用子程序或任务有什么好处?

1 个答案:

答案 0 :(得分:0)

您无法使用嵌套函数获取导致其任务崩溃的相同互斥变量。获取函数暂停任务,直到释放互斥变量link,以便您了解该工具如何获取。 抱歉,我的英语使用谷歌翻译。 :)