Owner's manual

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Page114
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NAV440UserManual
7430‐0131‐01Rev.F
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unsigned short peekWord(QUEUE_TYPE *queue_ptr, unsigned int index) {
unsigned short word, firstIndex, secondIndex;
firstIndex = (queue_ptr->front + index) % MAXQUEUE;
secondIndex = (queue_ptr->front + index + 1) % MAXQUEUE;
word = (queue_ptr->entry(firstIndex)<< 8) & 0xFF00;
word |= (0x00FF & queue_ptr->entry(secondIndex));
return word;
}
/*******************************************************************************
* FUNCTION: Pop - discard item(s) from queue
* ARGUMENTS: queue_ptr is pointer to the queue
* numToPop is number of items to discard
* RETURNS: return the number of items discarded
*******************************************************************************/
int Pop(QUEUE_TYPE *queue_ptr, int numToPop)
{
int i=0;
char tempchar;
for(i=0; i<numToPop; i++)
{
if(!DeleteQueue(&tempchar, queue_ptr))
{
break;
}
}
return i;
}
/*******************************************************************************
* FUNCTION: Size
* ARGUMENTS: queue_ptr is pointer to the queue
* RETURNS: return the number of items in the queue
*******************************************************************************/
int Size(QUEUE_TYPE *queue_ptr)
{
return queue_ptr->count;
}
/*******************************************************************************
* FUNCTION: Empty
* ARGUMENTS: queue_ptr is pointer to the queue
* RETURNS: return 1 if empty, 0 if not
*******************************************************************************/
int Empty(QUEUE_TYPE *queue_ptr)
{
return queue_ptr->count <= 0;
}
/*******************************************************************************
* FUNCTION: Full