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https://github.com/marqs85/ossc
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127 lines
4.8 KiB
C
127 lines
4.8 KiB
C
#ifndef __ALT_ALARM_H__
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#define __ALT_ALARM_H__
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/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2004 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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* Altera does not recommend, suggest or require that this reference design *
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* file be used in conjunction or combination with any other product. *
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******************************************************************************/
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/******************************************************************************
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* *
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* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT. *
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* *
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******************************************************************************/
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#include "alt_llist.h"
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#include "alt_types.h"
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#include "priv/alt_alarm.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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/*
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* "alt_alarm" is a structure type used by applications to register an alarm
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* callback function. An instance of this type must be passed as an input
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* argument to alt_alarm_start(). The user is not responsible for initialising
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* the contents of the instance. This is done by alt_alarm_start().
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*/
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typedef struct alt_alarm_s alt_alarm;
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/*
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* alt_alarm_start() can be called by an application/driver in order to register
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* a function for periodic callback at the system clock frequency. Be aware that
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* this callback is likely to occur in interrupt context.
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*/
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extern int alt_alarm_start (alt_alarm* the_alarm,
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alt_u32 nticks,
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alt_u32 (*callback) (void* context),
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void* context);
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/*
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* alt_alarm_stop() is used to unregister a callback. Alternatively the callback
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* can return zero to unregister.
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*/
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extern void alt_alarm_stop (alt_alarm* the_alarm);
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/*
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* Obtain the system clock rate in ticks/s.
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*/
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static ALT_INLINE alt_u32 ALT_ALWAYS_INLINE alt_ticks_per_second (void)
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{
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return _alt_tick_rate;
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}
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/*
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* alt_sysclk_init() is intended to be only used by the system clock driver
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* in order to initialise the value of the clock frequency.
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*/
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static ALT_INLINE int ALT_ALWAYS_INLINE alt_sysclk_init (alt_u32 nticks)
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{
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if (! _alt_tick_rate)
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{
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_alt_tick_rate = nticks;
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return 0;
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}
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else
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{
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return -1;
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}
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}
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/*
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* alt_nticks() returns the elapsed number of system clock ticks since reset.
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*/
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static ALT_INLINE alt_u32 ALT_ALWAYS_INLINE alt_nticks (void)
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{
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return _alt_nticks;
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}
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/*
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* alt_tick() should only be called by the system clock driver. This is used
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* to notify the system that the system timer period has expired.
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*/
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extern void alt_tick (void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ALT_ALARM_H__ */
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