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CCS/TMDSCNCD28335: print OSTime

Part Number: TMDSCNCD28335


Tool/software: Code Composer Studio

Device : F28335 contorolCRAD and Experimenter's Kit - Delfino F28335.
Ported ucos-II.
I use OSTimeGet() function to get OSTime.
But task1 returns '0'  everytime and task2 doesn't  work.
What is the problem?
How to fix this?

static void App_Task1 (void *p_arg)

     (void)&p_arg;
     INT32U t;

     while (DEF_TRUE) {

          t = OSTimeGet();

         printf("Task1 ");
         printf("OSTime=%lu\n",t);
         OSTimeDly(50);
    }
}


static void App_Task2 (void *p_arg)

      (void)&p_arg;
      INT32U t;

      while (DEF_TRUE) {

      t = OSTimeGet();


      printf("Task2 \n");
      printf("OSTime=%lu\n",t);
      OSTimeDly(100);


     }
}

==================================

Console :

Task1 OSTime=0