X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=drv%2Ftimer.c;h=60261e1f80328f928623947cdebfb53ed3502c45;hb=06f0503a2066ab4fd13529b8ed8906e52b1d672b;hp=a6c31d9208be1aaea6a0e9cff4540d2d0f5ad454;hpb=b555c91cd32df70ad6de56895d3ff0a5968c4630;p=bertos.git diff --git a/drv/timer.c b/drv/timer.c index a6c31d92..60261e1f 100755 --- a/drv/timer.c +++ b/drv/timer.c @@ -1,105 +1,134 @@ /*! * \file * * - * \version $Id$ + * \brief Hardware independent timer driver (implementation) * + * \version $Id$ * \author Bernardo Innocenti - * - * \brief Hardware independent timer driver (implementation) */ -/* - * $Log$ - * Revision 1.3 2004/06/06 17:18:42 bernie - * Fix \!CONFIG_KERN_SIGNALS code paths. - * - * Revision 1.2 2004/06/03 11:27:09 bernie - * Add dual-license information. - * - * Revision 1.1 2004/05/23 18:23:30 bernie - * Import drv/timer module. - * - */ +/*#* + *#* $Log$ + *#* Revision 1.21 2004/11/28 23:20:25 bernie + *#* Remove obsolete INITLIST macro. + *#* + *#* Revision 1.20 2004/11/16 20:59:06 bernie + *#* Add watchdog timer support. + *#* + *#* Revision 1.19 2004/10/19 08:56:49 bernie + *#* TIMER_STROBE_ON, TIMER_STROBE_OFF, TIMER_STROBE_INIT: Move from timer_avr.h to timer.h, where they really belong. + *#* + *#* Revision 1.18 2004/10/14 23:14:05 bernie + *#* Fix longstanding problem with wrap-arounds. + *#* + *#* Revision 1.17 2004/10/03 18:52:08 bernie + *#* Move \brief on top in header to please Doxygen. + *#* + *#* Revision 1.16 2004/10/03 18:48:01 bernie + *#* timer_delay(): Add a sanity check to avoid sleeping forever. + *#* + *#* Revision 1.15 2004/09/14 21:07:18 bernie + *#* Use debug.h instead of kdebug.h. + *#* + *#* Revision 1.14 2004/08/25 14:12:08 rasky + *#* Aggiornato il comment block dei log RCS + *#* + *#* Revision 1.13 2004/08/10 06:59:09 bernie + *#* timer_gettick(): Rename to timer_ticks() and add backwards compatibility inline. + *#* + *#* Revision 1.12 2004/08/08 05:59:37 bernie + *#* Remove a few useless casts. + *#* + *#* Revision 1.11 2004/08/02 20:20:29 aleph + *#* Merge from project_ks + *#* + *#* Revision 1.10 2004/07/30 14:15:53 rasky + *#* Nuovo supporto unificato per detect della CPU + *#* + *#* Revision 1.9 2004/07/21 00:15:13 bernie + *#* Put timer driver on diet. + *#* + *#* Revision 1.8 2004/07/18 21:57:07 bernie + *#* Fix preprocessor warning with potentially undefined symbol. + *#* + *#* Revision 1.6 2004/06/07 18:10:06 aleph + *#* Remove free pool of timers; use user-provided Timer structure instead + *#* + *#* Revision 1.5 2004/06/07 15:56:55 aleph + *#* Some tabs cleanup and add timer strobe macros + *#* + *#* Revision 1.4 2004/06/06 18:25:44 bernie + *#* Rename event macros to look like regular functions. + *#* + *#* Revision 1.3 2004/06/06 17:18:42 bernie + *#* Fix \!CONFIG_KERN_SIGNALS code paths. + *#* + *#* Revision 1.2 2004/06/03 11:27:09 bernie + *#* Add dual-license information. + *#* + *#* Revision 1.1 2004/05/23 18:23:30 bernie + *#* Import drv/timer module. + *#* + *#*/ -#include "hw.h" -#include "kdebug.h" #include "timer.h" +#include +#include +#include CPU_HEADER(timer) +#include +#include -#ifdef CONFIG_KERN_SIGNALS -#include +/* + * Sanity check for config parameters required by this module. + */ +#if !defined(CONFIG_KERNEL) || ((CONFIG_KERNEL != 0) && CONFIG_KERNEL != 1) + #error CONFIG_KERNEL must be set to either 0 or 1 in config.h #endif - -#if (ARCH & ARCH_EMUL) - -# error To be recoded - -#elif defined(__AVR__) -# include "timer_avr.h" -#elif defined(__IAR_SYSTEMS_ICC) || defined(__IAR_SYSTEMS_ICC__) /* 80C196 */ -# include "timer_i196.h" -#elif defined (__m56800__) -# include "timer_dsp56k.h" -#else -# error Unknown system +#if !defined(CONFIG_WATCHDOG) || ((CONFIG_WATCHDOG != 0) && CONFIG_WATCHDOG != 1) + #error CONFIG_WATCHDOG must be set to either 0 or 1 in config.h #endif +#if CONFIG_WATCHDOG + #include +#endif -/*! Number of available timers */ -#define MAX_TIMERS 4 - - -//! Master system clock (1ms accuracy) -volatile time_t _clock; - -static Timer soft_timers[MAX_TIMERS]; /*!< Pool of Timer structures */ -static List timers_pool; /*!< Pool of free timers */ -REGISTER static List timers_queue; /*!< Active timers */ +#if CONFIG_KERNEL && CONFIG_KERN_SIGNALS + #include +#endif /*! - * Return a new timer picking and removing it from the available - * timers pool. Return NULL if no more timers are available. + * \def CONFIG_TIMER_STROBE + * + * This is a debug facility that can be used to + * monitor timer interrupt activity on an external pin. + * + * To use strobes, redefine the macros TIMER_STROBE_ON, + * TIMER_STROBE_OFF and TIMER_STROBE_INIT and set + * CONFIG_TIMER_STROBE to 1. */ -Timer *timer_new(void) -{ - Timer *timer; - cpuflags_t flags; - - DISABLE_IRQSAVE(flags); - - /* Should never happen */ - if (ISLISTEMPTY(&timers_pool)) - { - ENABLE_IRQRESTORE(flags); - DB(kprintf("Tmrspool empty\n");) - return NULL; - } +#if !defined(CONFIG_TIMER_STROBE) || !CONFIG_TIMER_STROBE + #define TIMER_STROBE_ON do {/*nop*/} while(0) + #define TIMER_STROBE_OFF do {/*nop*/} while(0) + #define TIMER_STROBE_INIT do {/*nop*/} while(0) +#endif - /* Get a timer from the free pool */ - timer = (Timer *)timers_pool.head; - REMOVE((Node *)timer); - ENABLE_IRQRESTORE(flags); +//! Master system clock (1ms accuracy) +volatile time_t _clock; - return timer; -} +#ifndef CONFIG_TIMER_DISABLE_EVENTS /*! - * Delete a timer, putting it in the available timers queue. + * List of active asynchronous timers. */ -void timer_delete(Timer *timer) -{ - cpuflags_t flags; - DISABLE_IRQSAVE(flags); - ADDHEAD(&timers_pool, &timer->link); - ENABLE_IRQRESTORE(flags); -} +REGISTER static List timers_queue; /*! @@ -119,14 +148,18 @@ void timer_add(Timer *timer) /* Calculate expiration time for this timer */ timer->tick = _clock + timer->delay; - /* Search for the first node whose expiration time is + /* + * Search for the first node whose expiration time is * greater than the timer we want to add. */ node = (Timer *)timers_queue.head; while (node->link.succ) { - /* Stop just after the insert point */ - if (node->tick > timer->tick) + /* + * Stop just after the insertion point. + * (this fancy compare takes care of wrap-arounds). + */ + if (node->tick - timer->tick > 0) break; /* Go to next node */ @@ -134,7 +167,7 @@ void timer_add(Timer *timer) } /* Enqueue timer request into the list */ - INSERTBEFORE((Node *)timer, (Node *)node); + INSERTBEFORE(&timer->link, &node->link); ENABLE_IRQRESTORE(flags); } @@ -147,18 +180,25 @@ Timer *timer_abort(Timer *timer) { cpuflags_t flags; DISABLE_IRQSAVE(flags); - REMOVE((Node *)timer); + REMOVE(&timer->link); ENABLE_IRQRESTORE(flags); return timer; } +#endif /* CONFIG_TIMER_DISABLE_EVENTS */ + /*! * Wait for the specified amount of time (expressed in ms) */ void timer_delay(time_t time) { +#if defined(IRQ_GETSTATE) + /* We shouldn't sleep with interrupts disabled */ + ASSERT(IRQ_GETSTATE()); +#endif + #if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS Timer t; @@ -170,21 +210,31 @@ void timer_delay(time_t time) #else /* !CONFIG_KERN_SIGNALS */ - time_t start = timer_gettick(); + time_t start = timer_ticks(); /* Busy wait */ - while (timer_gettick() - start < time) { /* nop */ } + while (timer_ticks() - start < time) + { +#if CONFIG_WATCHDOG + wdt_reset(); +#endif + } #endif /* !CONFIG_KERN_SIGNALS */ } +#ifndef CONFIG_TIMER_DISABLE_UDELAY /*! * Wait for the specified amount of time (expressed in microseconds) + * + * \bug In AVR arch the maximum amount of time that can be used as + * delay could be very limited, depending on the hardware timer + * used. Check timer_avr.h, and what register is used as hptime_t. */ void timer_udelay(utime_t usec_delay) { - if (usec_delay > 1000) + if (UNLIKELY(usec_delay > 1000)) { timer_delay(usec_delay / 1000); usec_delay %= 1000; @@ -199,6 +249,7 @@ void timer_udelay(utime_t usec_delay) while (timer_hw_hpread() - start < delay) {} } +#endif /* CONFIG_TIMER_DISABLE_UDELAY */ /*! @@ -207,20 +258,27 @@ void timer_udelay(utime_t usec_delay) */ DEFINE_TIMER_ISR { - /* With the Metrowerks compiler, the only way to force the compiler generate - an interrupt service routine is to put a pragma directive within the function - body. */ + /* + * With the Metrowerks compiler, the only way to force the compiler generate + * an interrupt service routine is to put a pragma directive within the function + * body. + */ #ifdef __MWERKS__ #pragma interrupt saveall #endif +#ifndef CONFIG_TIMER_DISABLE_EVENTS Timer *timer; +#endif + + TIMER_STROBE_ON; timer_hw_irq(); /* Update the master ms counter */ ++_clock; +#ifndef CONFIG_TIMER_DISABLE_EVENTS /* * Check the first timer request in the list and process * it when it has expired. Repeat this check until the @@ -235,13 +293,15 @@ DEFINE_TIMER_ISR break; /* Retreat the expired timer */ - REMOVE((Node *)timer); + REMOVE(&timer->link); /* Execute the associated event */ - DOEVENT_INTR(&timer->expire); + event_do(&timer->expire); } -} +#endif /* CONFIG_TIMER_DISABLE_EVENTS */ + TIMER_STROBE_OFF; +} /*! @@ -249,17 +309,13 @@ DEFINE_TIMER_ISR */ void timer_init(void) { - int i; + TIMER_STROBE_INIT; - INITLIST(&timers_queue); - INITLIST(&timers_pool); - - /* Init all software timers in the free pool */ - for (i = 0; i < MAX_TIMERS; i++) - ADDTAIL(&timers_pool, (Node *)&soft_timers[i]); +#ifndef CONFIG_TIMER_DISABLE_EVENTS + LIST_INIT(&timers_queue); +#endif _clock = 0; timer_hw_init(); } -