定时器成功.txt

nios范例（含源代码）

#include <stdio.h>
#include "system.h"
#include "altera_avalon_pio_regs.h"
#include "altera_avalon_timer_regs.h"
#include "alt_types.h"

static void handle_Timer0_interrupts(void* context, alt_u32 id)
  {
    FILE*fp;
    fp=fopen("/dev/lcd_display","r+");
    if(fp)
      fprintf(fp,"%s","timer out!\n");
    fclose(fp);
    IOWR_ALTERA_AVALON_TIMER_STATUS(SYS_CLK_TIMER_BASE, 0);
  }

void init_timer()
  {
    IOWR_ALTERA_AVALON_TIMER_CONTROL (SYS_CLK_TIMER_BASE,
      ALTERA_AVALON_TIMER_CONTROL_ITO_MSK  |
      ALTERA_AVALON_TIMER_CONTROL_CONT_MSK |
      ALTERA_AVALON_TIMER_CONTROL_START_MSK);
    alt_irq_register( SYS_CLK_TIMER_IRQ,NULL, handle_Timer0_interrupts);	
  }

void start()
  {
    FILE*fp;
    fp=fopen("/dev/lcd_display","r+");
    if(fp)
      fprintf(fp,"%s","timer start!\n");
    fclose(fp);
  }


int main (void)
  {
    init_timer();
    start();
    fprintf(fp;"%s","timer start\n");
    for(;;);
  }