task.c

一个任务的之间调度的例子

#include "task.h"

/**************************************************
*progStart: start program                         *
*function:  create Send task and  Receive Task    *
*RETURN:        				  *
*/

void progStart(void)
{
    dataSemId = semBCreate (SEM_Q_FIFO, SEM_EMPTY);  /*create  signal*/

    tidSend = taskSpawn ("tSend", 200, 0, STACK_SIZE, (FUNCPTR)taskSend,
                          0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
    tidReceive = taskSpawn ("tReceive", 200, 0, STACK_SIZE,
                             (FUNCPTR)taskReceive,
    			    0, 0, 0, 0, 0, 0, 0, 0, 0, 0); 
    tidmain = taskSpawn ("tMain",200,0,STACK_SIZE,
                          (FUNCPTR)main,
                            0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
    return;                                           /*create task*/
}

/*************************************************
  for main printf
**************************************************/
void main(void)
{  
  while(1)
  {
   taskDelay(sysClkRateGet() * 3);
   printf("\n*******************\n");
  }

  return;
}

/**************************************************
* taskSend: send data                             *
* function:  send singnao vevry 2secd             *
* RETURN:        				  *
*/

void taskSend(void)
{
   SendInit();/*Send Task init*/
   
   while(1)
   {
      taskDelay(sysClkRateGet() * 2); /*task delay 2 sencond*/
      semGive(dataSemId);             /*send signal*/ 
   }

   return;

}

/**************************************************
* taskReceive: receive data                       *
* function:  waite dataSemId,                     *
* RETURN:        				  *
*/

void taskReceive(void)
{
   ReceiveInit();          /*receive task init*/
   while(1)
   {
      semTake(dataSemId, WAIT_FOREVER);
      printf("\n Receive a data");
   }
   
   return;

}

/**************************************************
* SendInit: init send task                        *
* function:  init send task                       *
* RETURN:        				  *
*/

void SendInit(void)
{
    printf("\nInitial Send  Task");
    return;
}

/**************************************************
* ReceiveInit: init receive task                  *
* function:  init receive task                    *
* RETURN:        				  *
*/

void ReceiveInit(void)
{
   printf("\nInitial Receive Task");
   return;
}

 
/**************************************************
* progStop:  stop program                         *
* function:  dele sem delet all task and stop pro *
* RETURN:        				  *
*/

void progStop(void)
{
    semDelete(dataSemId);  /*delete signal*/
     
    taskDelete(tidSend);   
    taskDelete(tidReceive);

    taskDelete(tidmain); 
    printf("the end!\n");
}