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Defines | |
#define | NUT_TICK_FREQ 1000UL |
Functions | |
void | NutRegisterTimer (void(*handler)(void *)) |
Initialize system timer. | |
u_long | NutGetCpuClock (void) |
Return the CPU clock in Hertz. | |
u_long | NutGetTickClock (void) |
Return the number of system ticks per second. | |
u_long | NutTimerMillisToTicks (u_long ms) |
Calculate system ticks for a given number of milliseconds. |
#define NUT_TICK_FREQ 1000UL |
Definition at line 146 of file ostimer_at91.c.
void NutRegisterTimer | ( | void(*)(void *) | handler | ) |
Initialize system timer.
Initialize system timer hardware.
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 160 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.
u_long NutGetCpuClock | ( | void | ) |
Return the CPU clock in Hertz.
On several AT91 CPUs the processor clock may differ from the clock driving the peripherals. In this case At91GetMasterClock() will provide the correct master clock.
Definition at line 349 of file ostimer_at91.c.
References Cy2239xGetFreq(), and NUT_CPU_FREQ.
u_long NutGetTickClock | ( | void | ) |
Return the number of system ticks per second.
Definition at line 368 of file ostimer_at91.c.
References inr, NUT_TICK_FREQ, NutGetCpuClock(), PIT_MR, PIT_PIV, and TC0_RC.
Calculate system ticks for a given number of milliseconds.
Definition at line 391 of file ostimer_at91.c.
References NutGetTickClock().