#include <cfg/os.h>
#include <sys/atom.h>
#include <dev/irqreg.h>
#include <arch/timer.h>

Include dependency graph for ostimer.c:

Defines
#define	NUT_TICK_NFREQ 1024L
	Nominal number of system ticks per second.
#define	NUT_TIMER_CRYSTAL 32768L
#define	NUT_TIMER_PRESCALE 1
#define	OCR_VALUE (((2 * NUT_TIMER_CRYSTAL / (NUT_TIMER_PRESCALE * NUT_TICK_NFREQ) + 1) / 2) - 1)
#define	NUT_TICK_FREQ ((2 * NUT_TIMER_CRYSTAL / (OCR_VALUE + 1) / NUT_TIMER_PRESCALE + 1) / 2)
#define	TCCRx TCCR0
#define	TCNTx TCNT0
#define	OCRx OCR0
#define	TIFR_OCFx _BV(OCF0)
#define	TIFR_TOVx _BV(TOV0)
#define	sig_TIMER sig_OUTPUT_COMPARE0
Functions
void	NutRegisterTimer (void(handler)(void ))
	Initialize system timer hardware.
uint32_t	NutArchClockGet (int idx)
	Return the CPU clock in Hertz.
uint32_t	NutGetTickClock (void)
	Return the number of system ticks per second.
uint32_t	NutTimerMillisToTicks (uint32_t ms)
	Calculate system ticks for a given number of milliseconds.

Define Documentation

#define NUT_TICK_NFREQ 1024L

Nominal number of system ticks per second.

The actual frequency depends on the timer crystal.

Note:: Since version 3.9.8, the default frequency had been changed from 16 Hz to 1024 Hz, when the timer is running with an external 32 kHz clock crystal.

Definition at line 122 of file ostimer.c.

#define NUT_TIMER_CRYSTAL 32768L

Definition at line 135 of file ostimer.c.

#define NUT_TIMER_PRESCALE 1

Definition at line 138 of file ostimer.c.

#define OCR_VALUE (((2 * NUT_TIMER_CRYSTAL / (NUT_TIMER_PRESCALE * NUT_TICK_NFREQ) + 1) / 2) - 1)

Definition at line 143 of file ostimer.c.

#define NUT_TICK_FREQ ((2 * NUT_TIMER_CRYSTAL / (OCR_VALUE + 1) / NUT_TIMER_PRESCALE + 1) / 2)

Definition at line 146 of file ostimer.c.

#define TCCRx TCCR0