Nut/OS System Timer implemented on the AT91. More...

Collaboration diagram for AT91 System Timer:

Defines
#define	NUT_TICK_FREQ 1000UL
Functions
void	NutRegisterTimer (void(handler)(void ))
	Initialize system timer.
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.

Detailed Description

Nut/OS System Timer implemented on the AT91.

Define Documentation

#define NUT_TICK_FREQ 1000UL

Definition at line 162 of file ostimer_at91.c.

Referenced by NutGetTickClock(), and NutRegisterTimer().

Function Documentation

void NutRegisterTimer ( void(*)(void *) handler )

Initialize system timer.

This function is automatically called by Nut/OS during system initialization.

Nut/OS uses on-chip timer 0 for its timer services. Applications should not modify any registers of this timer, but make use of the Nut/OS timer API. Timer 1 and timer 2 are available to applications.

Definition at line 176 of file ostimer_at91.c.

References _BV, inr, NUT_TICK_FREQ, NutGetCpuClock(), NutIrqEnable(), NutIrqSetPriority(), NutRegisterIrqHandler(), NutRegisterSysIrqHandler(), NutSysIrqEnable(), outr, PIT_MR, PIT_PITEN, PIT_PITIEN, PIT_PIV_LSB, PIT_PIVR, PMC_PCER, sig_TC0, syssig_PIT, TC0_CCR, TC0_CMR, TC0_ID, TC0_IDR, TC0_IER, TC0_RC, TC0_SR, TC_CLKDIS, TC_CLKEN, TC_CLKS_MCK32, TC_CPCS, TC_CPCTRG, and TC_SWTRG.