queue.c

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// **************************************************************************
// the includes

#include "sw/modules/queue/src/queue.h"


// needed for memset()
#include "string.h"


// **************************************************************************
// the globals

uint32_t   gEventIndex;

EVENT_Obj  gEvents[QUEUE_MAX_NUM_EVENTS];


// **************************************************************************
// the functions

QUEUE_Handle QUEUE_init(void *pMemory,const size_t numBytes)
{
  QUEUE_Handle handle;
  QUEUE_Obj *obj;
  

  if(numBytes < sizeof(QUEUE_Obj))
    return((QUEUE_Handle)NULL);


  // assign the handle
  handle = (QUEUE_Handle)pMemory;


  // assign the object
  obj = (QUEUE_Obj *)handle;


  // configure the queue
  obj->firstEvent = (EVENT_Handle)pMemory;
  obj->lastEvent = (EVENT_Handle)pMemory;


  // zero out the events
  gEventIndex = 0;
  (void)memset(&gEvents[0],0,sizeof(gEvents));

  return(handle);
} // end of QUEUE_init() function


void QUEUE_listen(QUEUE_Handle handle)
{

  for(;;)
    {

      // wait until the specific queue has an event
      while(QUEUE_isIdle(handle))
        {
          // allow some sleep time
          #ifndef MATLAB_SIMULATION
          asm(" NOP ");   
          asm(" NOP ");   
          asm(" NOP ");   
          asm(" NOP ");   
          asm(" NOP ");   
          #endif
        }


      // execute event
      QUEUE_executeEvent(handle);
    }  // end of for() loop

} // end of QUEUE_listen() function


// end of file