timer.h

00001 /*
00002  / _____)             _              | |
00003 ( (____  _____ ____ _| |_ _____  ____| |__
00004  \____ \| ___ |    (_   _) ___ |/ ___)  _ \
00005  _____) ) ____| | | || |_| ____( (___| | | |
00006 (______/|_____)_|_|_| \__)_____)\____)_| |_|
00007     (C)2013 Semtech
00008 
00009 Description: Timer objects and scheduling management
00010 
00011 License: Revised BSD License, see LICENSE.TXT file include in the project
00012 
00013 Maintainer: Miguel Luis and Gregory Cristian
00014 */
00015 #ifndef __TIMER_H__
00016 #define __TIMER_H__
00017 
00018 #include "mbed.h"
00019 
00020 /*!
00021  * \brief Timer object description
00022  */
00023 typedef struct TimerEvent_s
00024 {
00025     uint32_t value;
00026     void ( *Callback )( void );
00027     Ticker Timer;
00028 }TimerEvent_t;
00029 
00030 /*!
00031  * \brief Timer time variable definition
00032  */
00033 #ifndef TimerTime_t
00034 typedef uint32_t TimerTime_t;
00035 #endif
00036 
00037 /*!
00038  * \brief Inializes the timer used to get current time.
00039  *
00040  * \remark Current time corresponds to the time since system startup
00041  */
00042 void TimerTimeCounterInit( void );
00043 
00044 /*!
00045  * \brief Initializes the timer object
00046  *
00047  * \remark TimerSetValue function must be called before starting the timer.
00048  *         this function initializes timestamp and reload value at 0.
00049  *
00050  * \param [IN] obj          Structure containing the timer object parameters
00051  * \param [IN] callback     Function callback called at the end of the timeout
00052  */
00053 void TimerInit( TimerEvent_t *obj, void ( *callback )( void ) );
00054 
00055 /*!
00056  * \brief Starts and adds the timer object to the list of timer events
00057  *
00058  * \param [IN] obj Structure containing the timer object parameters
00059  */
00060 void TimerStart( TimerEvent_t *obj );
00061 
00062 /*!
00063  * \brief Stops and removes the timer object from the list of timer events
00064  *
00065  * \param [IN] obj Structure containing the timer object parameters
00066  */
00067 void TimerStop( TimerEvent_t *obj );
00068 
00069 /*!
00070  * \brief Resets the timer object
00071  *
00072  * \param [IN] obj Structure containing the timer object parameters
00073  */
00074 void TimerReset( TimerEvent_t *obj );
00075 
00076 /*!
00077  * \brief Set timer new timeout value
00078  *
00079  * \param [IN] obj   Structure containing the timer object parameters
00080  * \param [IN] value New timer timeout value
00081  */
00082 void TimerSetValue( TimerEvent_t *obj, uint32_t value );
00083 
00084 /*!
00085  * \brief Read the current time
00086  *
00087  * \retval time returns current time
00088  */
00089 TimerTime_t TimerGetCurrentTime( void );
00090 
00091 /*!
00092  * \brief Return the Time elapsed since a fix moment in Time
00093  *
00094  * \param [IN] savedTime    fix moment in Time
00095  * \retval time             returns elapsed time
00096  */
00097 TimerTime_t TimerGetElapsedTime( TimerTime_t savedTime );
00098 
00099 /*!
00100  * \brief Return the Time elapsed since a fix moment in Time
00101  *
00102  * \param [IN] eventInFuture    fix moment in the future
00103  * \retval time             returns difference between now and future event
00104  */
00105 TimerTime_t TimerGetFutureTime( TimerTime_t eventInFuture );
00106 
00107 #endif // __TIMER_H__