指令缓存队列

//*******************指令缓存队列*******************
struct{
  uint32_t head;
  uint32_t end;
  uint16_t KeyBuf[10];
}KeyCQueue;
void KeyCQueue_init(void)
{
  KeyCQueue.head = 0;
  KeyCQueue.end = 0;
}
uint16_t KeyCQueue_GetQueue(void)//出队列
{
  uint16_t value;
  if(KeyCQueue.head == KeyCQueue.end) return 0;
  value = KeyCQueue.KeyBuf[KeyCQueue.head];
  KeyCQueue.head = (KeyCQueue.head + 1)%10;
  KeyCQueue_Clear();
  return value;
}
void KeyCQueue_EnQueue(uint16_t value)//入队列
{
  if(KeyCQueue.head == (KeyCQueue.end + 1)%10) return ;
  if(xxx==1)//如果xxx，指令不缓存
  {
    KeyCQueue.KeyBuf[KeyCQueue.end] = value;
    KeyCQueue.end = (KeyCQueue.end + 1)%10;
  }
}
void KeyCQueue_Clear(void)
{
  KeyCQueue.head = 0;
  KeyCQueue.end = 0;  
}