DE2-115-FPGA-Pong/software/hello_world_bsp/HAL/inc/priv/alt_alarm.h

#ifndef __ALT_PRIV_ALARM_H__
#define __ALT_PRIV_ALARM_H__

/******************************************************************************
*                                                                             *
* License Agreement                                                           *
*                                                                             *
* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
* All rights reserved.                                                        *
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******************************************************************************/

/******************************************************************************
*                                                                             *
* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
*                                                                             *
******************************************************************************/

#include "alt_types.h"

/*
 * This header provides the internal defenitions required by the public 
 * interface alt_alarm.h. These variables and structures are not guaranteed to 
 * exist in future implementations of the HAL.
 */

#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */

/*
 * "alt_alarm_s" is a structure type used to maintain lists of alarm callback
 * functions.
 */

struct alt_alarm_s
{
  alt_llist llist;       /* linked list */
  alt_u32 time;          /* time in system ticks of the callback */
  alt_u32 (*callback) (void* context); /* callback function. The return 
                          * value is the period for the next callback; where 
                          * zero indicates that the alarm should be removed 
                          * from the list. 
                          */
  alt_u8 rollover;       /* set when desired alarm time + current time causes
                            overflow, to prevent premature alarm */
  void* context;         /* Argument for the callback */
};

/*
 * "_alt_tick_rate" is a global variable used to store the system clock rate 
 * in ticks per second. This is initialised to zero, which coresponds to there
 * being no system clock available. 
 *
 * It is then set to it's final value by the system clock driver through a call
 * to alt_sysclk_init(). 
 */

extern alt_u32 _alt_tick_rate;

/*
 * "_alt_nticks" is a global variable which records the elapsed number of 
 * system clock ticks since the last call to settimeofday() or since reset if
 * settimeofday() has not been called.
 */

extern volatile alt_u32 _alt_nticks;

/* The list of registered alarms. */

extern alt_llist alt_alarm_list;

#ifdef __cplusplus
}
#endif

#endif /* __ALT_PRIV_ALARM_H__ */