原创 nios II 实验二 数码管显示

#include "system.h"
#include "altera_avalon_pio_regs.h"         //包含基本的IO寄存器信息
#include "alt_types.h"                              //Altera定义的数据类型
#include "unistd.h"                                   //延时函数      

#define seg  *(volatile unsigned char *) SM_SEG_BASE
#define bit  *(volatile unsigned char *) SM_BIT_BASE

const alt_u8 duan[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
alt_u8 num[8] = {0,0,0,0,0,0,0,0};

void display(alt_u16 i)
{
    alt_u8 j;
    num[0] = i % 10;
    num[1] = (i / 100)%10;
    num[2] = (i / 1000)%10;
    num[3] = (i / 10000)%10;
    num[4] = (i / 100000)%10;
    num[5] = (i / 1000000)%10;
    num[6] = (i / 10000000)%10;
    num[7] = (i / 100000000)%10;
    
   for(j=0; j<8; j++)
    {
       bit = ~(0x01 << j);   //位选低位有效
       seg = duan[num[j]]; 
       usleep(500);  
    }
}

int main(void)
{

 alt_u16 n;
  
  while(1)
  {
    display(n);
    n++;

  }
  return 0;
}