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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

alt_alarm_start doesnt work

Here is my code:

# include <stdio.h># include <stdlib.h># include <stddef.h># include "system.h"# include "IO.h"# include "sys/alt_alarm.h"# include "alt_types.h"

/*Prototypes*/

alt_u32 timer_interrupt(void* context);

int alt_alarm_start(alt_alarm* alarm, alt_u32 nticks, alt_u32 (*callback) (void* context), void* context);

/*Global Variables*/

static alt_alarm alarm;

void main(){

printf("alt_sysclk_init: %d\n",alt_sysclk_init(TIMER_0_TICKS_PER_SEC)); //This is an edit. looks like I need that. With that alt_alarm_start works. Just dont get an interrupt.

if(alt_alarm_start(&alarm,1000,timer_interrupt,NULL) < 0)

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

}

alt_u32 timer_interrupt(void* context)

{

printf("tick\n");

return 1;

}

Where is the bug? I am running with "hello_world_small"(Must save memory). Looks like the alt_alarm_start fucntion return nothing(Null) -> get the "No system clock available" message.

EDIT: I am running with the timer and not just with CPU-ticks, or?

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Ok, well. Dont know where is the bug. But anyway. I just use now directly the timer interrupt and I am configuring the registers directly as well. This is working pretty good. This solution fits perfectly for me.

    So thx for help!

    void main(){

    IOWR(0x00000020,1,(1<<3) | (1 << 0) );//Stop Timer, IRQ enable, counter stops when getting 0

    IOWR(0x20,0,0); // Clear TO Bit(Reaching 0)

    IOWR(0x20,2,(alt_u16)(100000000-1)); // Clear TO Bit(Reaching 0);(100000000-1)=1s(100Mhz)

    IOWR(0x20,3,(alt_u16)( (100000000-1) >> 16 )); // Clear TO Bit(Reaching 0)

    alt_irq_register(TIMER_0_IRQ, NULL, timer_interrupt);

    IOWR(0x00000020,1,(1<<2) | (1 << 0) );//Start Timer, IRQ enable, counter stops when getting 0}

    return 0;

    }

    alt_u32 timer_interrupt(void* context)

    {

    IOWR(0x20,0,0); //Clear TO(timeout) bit)

    IOWR(0x00000020,1,(1<<2) | (1 << 0) );//Start Timer, IRQ enable, counter stops when getting 0

    printf("tick\n");

    return 1;

    }
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    No.

    But somehow if I activate the timer, the system do nothing after flashing

    btw. I dont use an operating system

    System: Stratix III Board. Timerout period is 1µs and the timer is full featured