X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=drv%2Ftimer.h;h=cd7aa1b48f6344f8bda8d235a4557b1b901b3f4b;hb=2535cb94ec2183791128f8bbd109ca69a960cf78;hp=88d9f2496fd061359adbc347b688f11eb16101af;hpb=0bdaf8448305a467ff057e8fa65fb922b6c5bc2f;p=bertos.git diff --git a/drv/timer.h b/drv/timer.h old mode 100755 new mode 100644 index 88d9f249..cd7aa1b4 --- a/drv/timer.h +++ b/drv/timer.h @@ -1,9 +1,34 @@ -/*! +/** * \file * * * \version $Id$ @@ -13,113 +38,210 @@ * \brief Hardware independent timer driver (interface) */ +#ifndef DRV_TIMER_H +#define DRV_TIMER_H + +#include +#include +#include +#include + + /* - * $Log$ - * Revision 1.7 2004/06/27 15:26:17 aleph - * Declaration fix for build with GCC 3.4 + * Include platform-specific binding header if we're hosted. + * Try the CPU specific one for bare-metal environments. + */ +#if OS_HOSTED + #include OS_HEADER(timer) +#else + #include CPU_HEADER(timer) +#endif + +#include +#include +#include +#include + + +extern volatile ticks_t _clock; + +/** + * \brief Return the system tick counter (expressed in ticks) * - * Revision 1.6 2004/06/07 18:10:06 aleph - * Remove free pool of timers; use user-provided Timer structure instead + * The result is guaranteed to increment monotonically, + * but client code must be tolerant with respect to overflows. * - * Revision 1.5 2004/06/07 15:57:12 aleph - * Add function prototypes + * The following code is safe: * - * Revision 1.4 2004/06/06 18:25:44 bernie - * Rename event macros to look like regular functions. + * \code + * ticks_t tea_start_time = timer_clock(); * - * Revision 1.3 2004/06/06 16:57:18 bernie - * Mark some functions INLINE instead of 'extern inline'. + * boil_water(); * - * Revision 1.2 2004/06/03 11:27:09 bernie - * Add dual-license information. + * if (timer_clock() - tea_start_time > TEAPOT_DELAY) + * printf("Your tea, Sir.\n"); + * \endcode * - * Revision 1.1 2004/05/23 18:23:30 bernie - * Import drv/timer module. + * \note This function must disable interrupts on 8/16bit CPUs because the + * clock variable is larger than the processor word size and can't + * be copied atomically. + */ +INLINE ticks_t timer_clock(void) +{ + ticks_t result; + + ATOMIC(result = _clock); + + return result; +} + +/** + * Faster version of timer_clock(), to be called only when the timer + * interrupt is disabled (DISABLE_INTS) or overridden by a + * higher-priority or non-nesting interrupt. * + * \sa timer_clock */ -#ifndef DRV_TIMER_H -#define DRV_TIMER_H +INLINE ticks_t timer_clock_unlocked(void) +{ + return _clock; +} -#include "cpu.h" -#include "compiler.h" -#include -#include +/** Convert \a ms [ms] to ticks. */ +INLINE ticks_t ms_to_ticks(mtime_t ms) +{ +#if TIMER_TICKS_PER_SEC < 1000 + /* Slow timer: avoid rounding down too much. */ + return (ms * TIMER_TICKS_PER_SEC) / 1000; +#else + /* Fast timer: don't overflow ticks_t. */ + return ms * DIV_ROUND(TIMER_TICKS_PER_SEC, 1000); +#endif +} -/*! Number of timer ticks per second. */ -#define TICKS_PER_SEC 1000 +/** Convert \a us [us] to ticks. */ +INLINE ticks_t us_to_ticks(utime_t us) +{ +#if TIMER_TICKS_PER_SEC < 1000 + /* Slow timer: avoid rounding down too much. */ + return ((us / 1000) * TIMER_TICKS_PER_SEC) / 1000; +#else + /* Fast timer: don't overflow ticks_t. */ + return (us * DIV_ROUND(TIMER_TICKS_PER_SEC, 1000)) / 1000; +#endif +} -typedef struct Timer +/** Convert \a ticks [ticks] to ms. */ +INLINE mtime_t ticks_to_ms(ticks_t ticks) { - Node link; /*!< Link into timers queue */ - time_t delay; /*!< Timer delay in ms */ - time_t tick; /*!< Timer will expire at this tick */ - Event expire; /*!< Event to execute when the timer expires */ -} Timer; +#if TIMER_TICKS_PER_SEC < 1000 + /* Slow timer: avoid rounding down too much. */ + return (ticks * 1000) / TIMER_TICKS_PER_SEC; +#else + /* Fast timer: avoid overflowing ticks_t. */ + return ticks / (TIMER_TICKS_PER_SEC / 1000); +#endif +} -/* Function protos */ -extern void timer_init(void); -extern void timer_add(Timer *timer); -extern Timer *timer_abort(Timer *timer); -extern void timer_delay(time_t time); -extern void timer_udelay(utime_t utime); -INLINE time_t timer_gettick(void); -INLINE time_t timer_gettick_irq(void); -INLINE void timer_set_event_softint(Timer* timer, Hook func, void* user_data); -INLINE void timer_set_delay(Timer* timer, time_t delay); +/** Convert \a ticks [ticks] to us. */ +INLINE utime_t ticks_to_us(ticks_t ticks) +{ +#if TIMER_TICKS_PER_SEC < 1000 + /* Slow timer: avoid rounding down too much. */ + return ((ticks * 1000) / TIMER_TICKS_PER_SEC) * 1000; +#else + /* Fast timer: avoid overflowing ticks_t. */ + return (ticks / (TIMER_TICKS_PER_SEC / 1000)) * 1000; +#endif +} -#if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS +/** Convert \a us [us] to hpticks */ +INLINE hptime_t us_to_hptime(utime_t us) +{ +#if TIMER_HW_HPTICKS_PER_SEC > 10000000UL + return us * DIV_ROUND(TIMER_HW_HPTICKS_PER_SEC, 1000000UL); +#else + return (us * ((TIMER_HW_HPTICKS_PER_SEC + 500) / 1000UL) + 500) / 1000UL; +#endif +} -/*! Set the timer so that it sends a signal when it expires */ -INLINE void timer_set_event_signal(Timer* timer, struct Process* proc, sigset_t sigs); -INLINE void timer_set_event_signal(Timer* timer, struct Process* proc, sigset_t sigs) +/** Convert \a hpticks [hptime] to usec */ +INLINE utime_t hptime_to_us(hptime_t hpticks) { - event_initSignal(&timer->expire, proc, sigs); +#if TIMER_HW_HPTICKS_PER_SEC < 100000UL + return hpticks * DIV_ROUND(1000000UL, TIMER_HW_HPTICKS_PER_SEC); +#else + return (hpticks * 1000UL) / DIV_ROUND(TIMER_HW_HPTICKS_PER_SEC, 1000UL); +#endif /* TIMER_HW_HPTICKS_PER_SEC < 100000UL */ } -#endif /* CONFIG_KERN_SIGNALS */ -/*! Set the timer so that it calls an user hook when it expires */ -INLINE void timer_set_event_softint(Timer* timer, Hook func, void* user_data) +void timer_init(void); +void timer_delayTicks(ticks_t delay); +INLINE void timer_delay(mtime_t delay) { - event_initSoftInt(&timer->expire, func, user_data); + timer_delayTicks(ms_to_ticks(delay)); } -/*! Set the timer delay (the time before the event will be triggered) */ -INLINE void timer_set_delay(Timer* timer, time_t delay) +#if !defined(CONFIG_TIMER_DISABLE_UDELAY) +void timer_busyWait(hptime_t delay); +void timer_delayHp(hptime_t delay); +INLINE void timer_udelay(utime_t delay) { - timer->delay = delay; + timer_delayHp(us_to_hptime(delay)); } +#endif +#ifndef CONFIG_TIMER_DISABLE_EVENTS -extern volatile time_t _clock; +#include -/*! - * Return the system tick counter (expressed in ms) - * This function must disable interrupts on 8/16bit CPUs because the - * clock variable is larger than the processor word size and can't - * be copied atomically. +/** + * The timer driver supports multiple synchronous timers + * that can trigger an event when they expire. + * + * \sa timer_add() + * \sa timer_abort() */ -INLINE time_t timer_gettick(void) +typedef struct Timer { - time_t result; - cpuflags_t flags; + Node link; /**< Link into timers queue */ + ticks_t _delay; /**< Timer delay in ms */ + ticks_t tick; /**< Timer will expire at this tick */ + Event expire; /**< Event to execute when the timer expires */ + DB(uint16_t magic;) +} Timer; - DISABLE_IRQSAVE(flags); - result = _clock; - ENABLE_IRQRESTORE(flags); +/** Timer is active when Timer.magic contains this value (for debugging purposes). */ +#define TIMER_MAGIC_ACTIVE 0xABBA +#define TIMER_MAGIC_INACTIVE 0xBAAB - return result; +extern void timer_add(Timer *timer); +extern Timer *timer_abort(Timer *timer); + +/** Set the timer so that it calls an user hook when it expires */ +INLINE void timer_set_event_softint(Timer *timer, Hook func, iptr_t user_data) +{ + event_initSoftInt(&timer->expire, func, user_data); } +/** Set the timer delay (the time before the event will be triggered) */ +INLINE void timer_setDelay(Timer *timer, ticks_t delay) +{ + timer->_delay = delay; +} -/*! - * Like \c timer_gettick, faster version to be called - * from interrupt context only. - */ -INLINE time_t timer_gettick_irq(void) +#endif /* CONFIG_TIMER_DISABLE_EVENTS */ + +#if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS + +/** Set the timer so that it sends a signal when it expires */ +INLINE void timer_set_event_signal(Timer *timer, struct Process *proc, sigmask_t sigs) { - return _clock; + event_initSignal(&timer->expire, proc, sigs); } -#endif /* DRV_TIMER_H */ +#endif /* CONFIG_KERN_SIGNALS */ + +#endif /* DRV_TIMER_H */