/*
* Setup the timer 0 to generate the tick interrupts at the required frequency.
*/
static void
prvSetupTimerInterrupt( void )
{
/* Setup the AIC for PIT interrupts. The interrupt routine chosen depends
* on whether the preemptive or cooperative scheduler is being used.
*/
#if configUSE_PREEMPTION == 0
AT91F_AIC_ConfigureIt( AT91C_BASE_AIC, AT91C_ID_SYS, AT91C_AIC_PRIOR_HIGHEST,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL,
( void ( * )( void ) )vNonPreemptiveTick );
#else
AT91F_AIC_ConfigureIt( AT91C_BASE_AIC, AT91C_ID_SYS, AT91C_AIC_PRIOR_HIGHEST,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL,
( void ( * )( void ) )vPreemptiveTick );
#endif
/* Configure the PIT period. */
AT91F_PITInit( AT91C_BASE_PITC, portTICK_RATE_MS * 1000U, configCPU_CLOCK_HZ / 1000000U );
AT91F_PITEnableInt( AT91C_BASE_PITC );
AT91F_AIC_EnableIt( AT91C_BASE_AIC, AT91C_ID_SYS );
}
void _clock_init(void)
{
AT91F_PITInit(AT91C_BASE_PITC, 1000, 50); /* Period = 1000 Hz, CLK = 50 MHz */
}