X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=drv%2Ftimer.c;fp=drv%2Ftimer.c;h=0000000000000000000000000000000000000000;hb=791e167e053bdd9250d34a9a5ccae6ccde4d6679;hp=0e756dbb6cb01c435062380cbd60536d0e165520;hpb=faf2f6bfd5933ff75e6cc01e3d48f9277f731d8f;p=bertos.git diff --git a/drv/timer.c b/drv/timer.c deleted file mode 100644 index 0e756dbb..00000000 --- a/drv/timer.c +++ /dev/null @@ -1,339 +0,0 @@ -/** - * \file - * - * - * \brief Hardware independent timer driver (implementation) - * - * \version $Id$ - * \author Bernardo Innocenti - */ - -#include "timer.h" - -#include -#include -#include - -#include -#include -#include -#include - -/* - * Include platform-specific binding code if we're hosted. - * Try the CPU specific one for bare-metal environments. - */ -#if OS_HOSTED - #include OS_CSOURCE(timer) -#else - #include CPU_CSOURCE(timer) -#endif - -/* - * 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 !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 - -#if CONFIG_KERNEL - #include - #if CONFIG_KERN_PREEMPTIVE - #include - #endif - #if CONFIG_KERN_SIGNALS - #include /* sig_wait(), sig_check() */ - #include /* proc_current() */ - #include /* BV() */ - #endif -#endif - - -/** - * \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. - */ -#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 - - -/// Master system clock (1 tick accuracy) -volatile ticks_t _clock; - - -#ifndef CONFIG_TIMER_DISABLE_EVENTS - -/** - * List of active asynchronous timers. - */ -REGISTER static List timers_queue; - - -/** - * Add the specified timer to the software timer service queue. - * When the delay indicated by the timer expires, the timer - * device will execute the event associated with it. - * - * \note Interrupt safe - */ -void timer_add(Timer *timer) -{ - Timer *node; - cpuflags_t flags; - - - /* Inserting timers twice causes mayhem. */ - ASSERT(timer->magic != TIMER_MAGIC_ACTIVE); - DB(timer->magic = TIMER_MAGIC_ACTIVE;) - - IRQ_SAVE_DISABLE(flags); - - /* Calculate expiration time for this timer */ - timer->tick = _clock + timer->_delay; - - /* - * Search for the first node whose expiration time is - * greater than the timer we want to add. - */ - node = (Timer *)LIST_HEAD(&timers_queue); - while (node->link.succ) - { - /* - * 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 */ - node = (Timer *)node->link.succ; - } - - /* Enqueue timer request into the list */ - INSERT_BEFORE(&timer->link, &node->link); - - IRQ_RESTORE(flags); -} - - -/** - * Remove a timer from the timer queue before it has expired. - */ -Timer *timer_abort(Timer *timer) -{ - ATOMIC(REMOVE(&timer->link)); - DB(timer->magic = TIMER_MAGIC_INACTIVE;) - - return timer; -} - -#endif /* CONFIG_TIMER_DISABLE_EVENTS */ - - -/** - * Wait for the specified amount of timer ticks. - */ -void timer_delayTicks(ticks_t delay) -{ -#if defined(IRQ_ENABLED) - /* We shouldn't sleep with interrupts disabled */ - ASSERT(IRQ_ENABLED()); -#endif - -#if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS - Timer t; - - ASSERT(!sig_check(SIG_SINGLE)); - timer_set_event_signal(&t, proc_current(), SIG_SINGLE); - timer_setDelay(&t, delay); - timer_add(&t); - sig_wait(SIG_SINGLE); - -#else /* !CONFIG_KERN_SIGNALS */ - - ticks_t start = timer_clock(); - - /* Busy wait */ - while (timer_clock() - start < delay) - { -#if CONFIG_WATCHDOG - wdt_reset(); -#endif - } - -#endif /* !CONFIG_KERN_SIGNALS */ -} - - -#ifndef CONFIG_TIMER_DISABLE_UDELAY - -/** - * Busy wait until the specified amount of high-precision ticks have elapsed. - * - * \note This function is interrupt safe, the only - * requirement is a running hardware timer. - */ -void timer_busyWait(hptime_t delay) -{ - hptime_t now, prev = timer_hw_hpread(); - hptime_t delta; - - for(;;) - { - now = timer_hw_hpread(); - /* - * We rely on hptime_t being unsigned here to - * reduce the modulo to an AND in the common - * case of TIMER_HW_CNT. - */ - delta = (now - prev) % TIMER_HW_CNT; - if (delta >= delay) - break; - delay -= delta; - prev = now; - } -} - -/** - * 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_delayHp(hptime_t delay) -{ - if (UNLIKELY(delay > us_to_hptime(1000))) - { - timer_delayTicks(delay / (TIMER_HW_HPTICKS_PER_SEC / TIMER_TICKS_PER_SEC)); - delay %= (TIMER_HW_HPTICKS_PER_SEC / TIMER_TICKS_PER_SEC); - } - - timer_busyWait(delay); -} -#endif /* CONFIG_TIMER_DISABLE_UDELAY */ - - -/** - * Timer interrupt handler. Find soft timers expired and - * trigger corresponding events. - */ -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. - */ - #ifdef __MWERKS__ - #pragma interrupt saveall - #endif - -#ifndef CONFIG_TIMER_DISABLE_EVENTS - Timer *timer; -#endif - /* - * On systems sharing IRQ line and vector, this check is needed - * to ensure that IRQ is generated by timer source. - */ - if (!timer_hw_triggered()) - return; - - TIMER_STROBE_ON; - - /* Perform hw IRQ handling */ - 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 - * first node has not yet expired. Since the list is sorted - * by expiry time, all the following requests are guaranteed - * to expire later. - */ - while ((timer = (Timer *)LIST_HEAD(&timers_queue))->link.succ) - { - /* This request in list has not yet expired? */ - if (_clock - timer->tick < 0) - break; - - /* Retreat the expired timer */ - REMOVE(&timer->link); - DB(timer->magic = TIMER_MAGIC_INACTIVE;) - - /* Execute the associated event */ - event_do(&timer->expire); - } -#endif /* CONFIG_TIMER_DISABLE_EVENTS */ - - TIMER_STROBE_OFF; -} - -MOD_DEFINE(timer) - -/** - * Initialize timer - */ -void timer_init(void) -{ - TIMER_STROBE_INIT; - -#ifndef CONFIG_TIMER_DISABLE_EVENTS - LIST_INIT(&timers_queue); -#endif - - _clock = 0; - - timer_hw_init(); - - MOD_INIT(timer); -}