77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
#ifndef _INTERNALS_TIMER_H
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#define _INTERNALS_TIMER_H
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#include <timer.h>
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#include <stdint.h>
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/*
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timer_t
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A virtual or hardware timer. We need to declare the struct timer_t name
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so that we can forward-reference it.
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*/
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typedef struct timer_t
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{
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// Current delay, how much time elapsed since last interrupt occurred.
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uint32_t ms_delay;
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uint32_t ms_elapsed;
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// Is the virtual slot free? Is the virtual timer active?
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uint8_t used :1;
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uint8_t active :1;
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// Is this a virtual timer? Is this the virtual timer support?
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uint8_t virtual :1;
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uint8_t vsupport :1;
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// How many events do I have received but not executed?
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uint8_t events :4;
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// How many repeats are left.
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uint32_t repeats_left :24;
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// Callback function (NULL for event-firing timers) and its argument.
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void *callback;
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void *argument;
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} __attribute__((packed, aligned(4))) timer_t;
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// Hardware timers.
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extern timer_t htimers[3];
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// Virtual timers.
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extern timer_t vtimers[TIMER_SLOTS];
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/*
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timer_interrupt()
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Handles the interrupt for the given timer channel.
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*/
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void timer_interrupt(int channel);
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/*
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timer_callback_event()
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Executes the callback of a timer, or pushes a new timer event depending
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on the timer configuration. Also reduces the amount of repeats left and
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clears the active flag (or stops the hardware timer) if this number
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falls from one to zero.
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*/
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void timer_callback_event(timer_t *timer);
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/*
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vtimer_interrupt()
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Interrupt handling subsystem for the virtual timers.
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*/
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void vtimer_interrupt(void);
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/*
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vtimer_updateOne()
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Update the virtual timer hardware support timer, knowing that a virtual
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timer with the given delay has been started.
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*/
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void vtimer_updateOne(int additional_delay_ms);
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/*
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vtimer_updateAll()
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Updates the virtual timer hardware support after computing the GCD of
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all virtual timers delays. This is rather long so avoid calling this
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when possible.
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*/
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void vtimer_updateAll(void);
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#endif // _INTERNALS_TIMER_H
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