esp-idf/components/bt/bluedroid/osi/include/alarm.h

77 lines
2.9 KiB
C
Raw Normal View History

/******************************************************************************
*
* Copyright (C) 2014 Google, 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.
*
******************************************************************************/
#ifndef _ALARM_H_
#define _ALARM_H_
#include <stdint.h>
#include <freertos/FreeRTOS.h>
#include <freertos/timers.h>
typedef uint32_t period_ms_t;
typedef void (*osi_alarm_callback_t)(void *data);
#define ALARM_CBS_NUM 20
#define ALARM_ID_BASE 1000
typedef struct alarm_t {
/* timer id point to here */
TimerHandle_t alarm_hdl;
osi_alarm_callback_t cb;
void *cb_data;
} osi_alarm_t;
void osi_alarm_init(void);
// Creates a new alarm object. The returned object must be freed by calling
// |alarm_free|. Returns NULL on failure.
osi_alarm_t *osi_alarm_new(char *alarm_name, osi_alarm_callback_t callback, void *data, period_ms_t timer_expire);
// Frees an alarm object created by |alarm_new|. |alarm| may be NULL. If the
// alarm is pending, it will be cancelled. It is not safe to call |alarm_free|
// from inside the callback of |alarm|.
int osi_alarm_free(osi_alarm_t *alarm);
// Sets an alarm to fire |cb| after the given |deadline|. Note that |deadline| is the
// number of milliseconds relative to the current time. |data| is a context variable
// for the callback and may be NULL. |cb| will be called back in the context of an
// unspecified thread (i.e. it will not be called back in the same thread as the caller).
// |alarm| and |cb| may not be NULL.
int osi_alarm_set(osi_alarm_t *alarm, period_ms_t timeout);
// This function cancels the |alarm| if it was previously set. When this call
// returns, the caller has a guarantee that the callback is not in progress and
// will not be called if it hasn't already been called. This function is idempotent.
// |alarm| may not be NULL.
int osi_alarm_cancel(osi_alarm_t *alarm);
period_ms_t osi_alarm_now(void);
// Figure out how much time until next expiration.
// Returns 0 if not armed. |alarm| may not be NULL.
// TODO: Remove this function once PM timers can be re-factored
period_ms_t osi_alarm_get_remaining_ms(const osi_alarm_t *alarm);
// Alarm-related state cleanup
//void alarm_cleanup(void);
// Compute time difference (t1-t2) considering tick counter wrap
// t1 and t2 should be no greater than the time of MAX ticks
period_ms_t osi_alarm_time_diff(period_ms_t t1, period_ms_t t2);
#endif /*_ALARM_H_*/