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111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
//---
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//
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// gint core module: timer
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//
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// Basic timer unit manipulation. Starts and stops timers with variable
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// number of repeats, and allows timer reloads without pause.
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//
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//---
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#ifndef _TIMER_H
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#define _TIMER_H 1
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#include <clock.h>
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//---
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// Constants.
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//---
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// Timer identifiers.
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#define TIMER_0 0
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#define TIMER_TMU0 TIMER_0
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#define TIMER_1 1
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#define TIMER_TMU1 TIMER_1
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#define TIMER_2 2
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#define TIMER_TMU2 TIMER_2
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// Timer function identifiers.
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#define TIMER_KEYBOARD TIMER_TMU0
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#define TIMER_GRAY TIMER_TMU1
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#define TIMER_USER TIMER_TMU2
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// Timer prescalers.
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#define TIMER_Po_4 0
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#define TIMER_Po_16 1
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#define TIMER_Po_64 2
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#define TIMER_Po_256 3
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#define TIMER_TCLK 5
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//---
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// Public API.
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//---
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/*
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timer_start()
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Configures and starts a timer. The timer argument expects a timer name.
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You can use TIMER_USER anytime. You may also use TIMER_GRAY if you're
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not running the gray engine.
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Unit names are defined in the clock.h header and must be one of the
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following:
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- Clock_us (microseconds)
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- Clock_ms (milliseconds)
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- Clock_s (seconds)
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- Clock_Hz (hertz)
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- Clock_kHz (kilohertz)
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- Clock_MHz (megahertz)
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The number of repeats may to set to 0. In this case, the timer will not
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stop until timer_stop() is explicitly called.
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*/
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void timer_start(int timer, int delay_or_frequency, enum ClockUnit unit,
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void (*callback)(void), int repeats);
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/*
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timer_start2()
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Basically the same as timer_start(), but uses a clock-count delay and a
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prescaler. The possible values for the prescaler are dividers of the
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peripheral clock frequency Po:
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- TIMER_Po_4
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- TIMER_Po_16
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- TIMER_Po_64
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- TIMER_Po_256
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- TIMER_TCLK
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*/
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void timer_start2(int timer, int delay, int prescaler, void (*callback)(void),
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int repeats);
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/*
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timer_stop()
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Stops the given timer. This function may be called even if the timer is
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not running.
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*/
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void timer_stop(int timer);
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/*
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timer_reload()
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Reloads the given timer with the supplied constant. Starts the timer if
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it was stopped.
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*/
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void timer_reload(int timer, int new_delay_or_frequency, enum ClockUnit unit);
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/*
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timer_reload2()
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Same as timer_reload(), but again uses the native clock count. The
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prescaler may not be changed.
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*/
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void timer_reload2(int timer, int new_delay);
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//---
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// Internal API.
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// Referenced for documentation purposes only. Do not call.
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//---
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/*
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timer_interrupt()
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Handles the interrupt for the given timer.
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*/
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void timer_interrupt(int timer) __attribute__((section(".gint.int")));
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#endif // _TIMER_H
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