东月之神

#include "system.h"
#include "altera_avalon_timer_regs.h"
#include "altera_avalon_pio_regs.h"
#include "alt_types.h"
#include "sys/alt_irq.h"
#include "unistd.h"
#include <stdio.h>

#define seg *(volatile unsigned char *) SEG_BASE
#define bit *(volatile unsigned char *) BIT_BASE
 

void timer_init();
void Timer_ISR(void *context, alt_u32 id);

alt_u8 second = 0;
alt_u8 table[16] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,
                    0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71};

void timer_init()
{
      alt_irq_register(TIMER_IRQ, 0, Timer_ISR);
      IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_BASE, 0);
      //IOWR_ALTERA_AVALON_TIMER_PERIODH(TIMER_BASE, 50000000 >> 16);
     // IOWR_ALTERA_AVALON_TIMER_PERIODL(TIMER_BASE, 50000000 &0xffff);
      IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_BASE, 7);
     
}

void Timer_ISR(void *context, alt_u32 id)
{
   // printf("%d\n", second);
    second++;
    if(second == 10)
    {
        second = 0;
    }
    //seg = table[second];
    IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_BASE, 0);
}

int main(void)
{
 
     bit = 3;
     timer_init();
     while(1)
     {              
        seg = table[second]; 
        usleep(500);
        //printf("%d\n", second);        
     }
   return 0;
}