alt_alarm_start

Hi all, I have copied 100% of the example and tried it. But I did not get any alarm activity. Can you point out the problem?

# include <stdlib.h># include "stdio.h"# include "alt_types.h"# include "altera_avalon_pio_regs.h"# include "altera_avalon_timer.h"# include "altera_avalon_timer_regs.h"# include "system.h"# include "sys/alt_alarm.h"

static alt_alarm alarm_100ms;

alt_u32 alarm_100ms_callback (void* context);

static volatile unsigned char alarmflags=0;# define ALARM_100MS 0x01

# define ALARMTICKS(x) ((alt_ticks_per_second()*(x))/1000)

int main() {

if (alt_alarm_start (&alarm_100ms,ALARMTICKS(100),alarm_100ms_callback ,NULL) < 0) {

printf("No system clock available\r\n");

}

while(1) {

if(alarmflags&ALARM_100MS) {

alarmflags&=~ALARM_100MS;

printf("Alarm arrived\r\n");

}

}

}

//################################################### ###############

// ALRM CALLBACK FUNCTIONS

//################################################### ###############

alt_u32 alarm_100ms_callback (void* context) {

alarmflags|=ALARM_100MS;

printf("In alarm\r\n");

return alt_ticks_per_second ();

}