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      EEPW首頁 > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > 一種高效定時(shí)器模塊的設(shè)計(jì)與實(shí)現(xiàn)

      一種高效定時(shí)器模塊的設(shè)計(jì)與實(shí)現(xiàn)

      作者: 時(shí)間:2011-03-25 來源:電子產(chǎn)品世界 收藏

        typedef enum{

      本文引用地址:http://www.biyoush.com/article/118088.htm

        FEEDWATCHDOG_300MS,

        INPUT_DETECT_MS,

        LIN_TIMESLOT_MS,

        SPEED_PULSE_ACCUMU_200MS,

        ALLDR_LOCK_200MS,

        ALARM_30S,

        IGNITION_OFF_60S,

        ...

        ...

        MAX_TIMER_NUM

        }TimerId;

        這樣,定義數(shù)組Timer TIMER[MAX_TIMER_NUM],在初始化中,TIMER [i].timer_id=i;之后通過TIMER[timer_id]即可枚舉某軟件定時(shí)器節(jié)點(diǎn)。

        定時(shí)器管理

        定時(shí)器管理包括啟動(dòng)、運(yùn)行、停止、重啟和讀取計(jì)時(shí)時(shí)間等功能[4],相應(yīng)API函數(shù)定義如下:

        void TimerStart(TimerId timer_id,ulong timeout,Bool cycle,uchar cnt_times);

        void TimerReStart(TimerId timer_id);

        void TimerTick(void);

        void TimerStop(TimerId timer_id);

        void TimerStall(TimerId timer_id);

        ulong TimerGet(TimerId timer_id);

        啟動(dòng)定時(shí)器函數(shù)如下:

        #dene RTIPERIOD 2

        void TimerStart(TimerId timer_id,ulong timeout,Bool cycle,uchar cnt_times)

        {

        TIMER[timer_id].timer_state=RUNNING;

        TIMER[timer_id].duration=0;

        TIMER[timer_id].timeout=timeout/RTIPERIOD;

        TIMER[timer_id].cycle=cycle;

        TIMER[timer_id].cnt_times=cnt_times;

        TIMER[timer_id].timer_id=timer_id;

        }



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