lwpa_timer.h

/******************************************************************************
 * Copyright 2018 ETC Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************
 * This file is a part of lwpa. For more information, go to:
 * https://github.com/ETCLabs/lwpa
 ******************************************************************************/
 
/* lwpa_timer.h: Platform-neutral implementation of system timers. */
#ifndef _LWPA_TIMER_H_
#define _LWPA_TIMER_H_
 
#include "lwpa_int.h"
#include "lwpa_bool.h"
 
typedef struct LwpaTimer
{
  uint32_t reset_time; 
  uint32_t interval;   
} LwpaTimer;
 
#ifdef __cplusplus
extern "C" {
#endif
 
uint32_t lwpa_getms();
 
#define lwpa_timer_start(lwpatimerptr, intval) \
  do                                           \
  {                                            \
    (lwpatimerptr)->reset_time = lwpa_getms(); \
    (lwpatimerptr)->interval = intval;         \
  } while (0)
 
#define lwpa_timer_reset(lwpatimerptr) (((lwpatimerptr)->reset_time) = lwpa_getms())
 
#define lwpa_timer_elapsed(lwpatimerptr) (lwpa_getms() - (lwpatimerptr)->reset_time)
 
#define lwpa_timer_isexpired(lwpatimerptr) \
  (((lwpatimerptr)->interval == 0) || (lwpa_timer_elapsed(lwpatimerptr) > (lwpatimerptr)->interval))
 
uint32_t lwpa_timer_remaining(const LwpaTimer *timer);
 
#ifdef __cplusplus
}
#endif
 
#endif /* _LWPA_TIMER_H_ */