X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=drv%2Ftimer.c;h=bd0ff9daed9ec26bfe5ae35ff5266917b72329b1;hb=HEAD;hp=a01f6f3cb88e4cc52d1f4883c5e4bae99b41678a;hpb=0fee90eca2cd56674ba7708dc113e8794327cee0;p=bertos.git diff --git a/drv/timer.c b/drv/timer.c deleted file mode 100755 index a01f6f3c..00000000 --- a/drv/timer.c +++ /dev/null @@ -1,254 +0,0 @@ -/*! - * \file - * - * - * \version $Id$ - * - * \author Bernardo Innocenti - * - * \brief Hardware independent timer driver (implementation) - */ - -/* - * $Log$ - * Revision 1.1 2004/05/23 18:23:30 bernie - * Import drv/timer module. - * - */ - -#include "hw.h" -#include "kdebug.h" -#include "timer.h" - -#ifdef CONFIG_KERN_SIGNALS -#include -#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 -#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 */ - - -/*! - * Return a new timer picking and removing it from the available - * timers pool. Return NULL if no more timers are available. - */ -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; - } - - /* Get a timer from the free pool */ - timer = (Timer *)timers_pool.head; - REMOVE((Node *)timer); - - ENABLE_IRQRESTORE(flags); - - return timer; -} - - -/*! - * Delete a timer, putting it in the available timers queue. - */ -void timer_delete(Timer *timer) -{ - cpuflags_t flags; - DISABLE_IRQSAVE(flags); - ADDHEAD(&timers_pool, &timer->link); - ENABLE_IRQRESTORE(flags); -} - - -/*! - * 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; - - DISABLE_IRQSAVE(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 *)timers_queue.head; - while (node->link.succ) - { - /* Stop just after the insert point */ - if (node->tick > timer->tick) - break; - - /* Go to next node */ - node = (Timer *)node->link.succ; - } - - /* Enqueue timer request into the list */ - INSERTBEFORE((Node *)timer, (Node *)node); - - ENABLE_IRQRESTORE(flags); -} - - -/*! - * Remove a timer from the timer queue before it has expired - */ -Timer *timer_abort(Timer *timer) -{ - cpuflags_t flags; - DISABLE_IRQSAVE(flags); - REMOVE((Node *)timer); - ENABLE_IRQRESTORE(flags); - - return timer; -} - - -/*! - * Wait for the specified amount of time (expressed in ms) - */ -void timer_delay(time_t time) -{ -#ifdef CONFIG_KERN_SIGNALS - Timer t; - - ASSERT(!sig_check(SIG_SINGLE)); - timer_set_event_signal(&t, proc_current(), SIG_SINGLE); - timer_set_delay(&t, time); - timer_add(&t); - sig_wait(SIG_SINGLE); -#else - time_t start = timer_gettick(); - - while (timer_gettick() - start < time) { /* nop */ } -#endif -} - -/*! - * Wait for the specified amount of time (expressed in microseconds) - */ -void timer_udelay(utime_t usec_delay) -{ - if (usec_delay > 1000) - { - timer_delay(usec_delay / 1000); - usec_delay %= 1000; - } - - // FIXME: This multiplication is too slow at run-time. We should try and move it - // to compile-time by exposing the TIMER_HW_HPTICKS_PER_SEC in the header - // file. - hptime_t start = timer_hw_hpread(); - hptime_t delay = (uint32_t)usec_delay * TIMER_HW_HPTICKS_PER_SEC / 1000000ul; - - while (timer_hw_hpread() - start < delay) - {} -} - - -/*! - * 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 - - Timer *timer; - - timer_hw_irq(); - - /* Update the master ms counter */ - ++_clock; - - /* - * 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 *)timers_queue.head)->link.succ) - { - /* This request in list has not yet expired? */ - if (_clock < timer->tick) - break; - - /* Retreat the expired timer */ - REMOVE((Node *)timer); - - /* Execute the associated event */ - DOEVENT_INTR(&timer->expire); - } -} - - - -/*! - * Initialize timer - */ -void timer_init(void) -{ - int i; - - 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]); - - _clock = 0; - - timer_hw_init(); -} -