数码管的动态显示

zsyong87

/*------------------------------------------------------------------------------
  利用ATmeag16单片机驱动数码管显示数字，PD端口第一位驱动数码的段选，第二位驱动
数码管的位选。PA端口送入数据。
------------------------------------------------------------------------------*/

#include <iom16v.h>
#include <macros.h>

#define uchar unsigned char

uchar table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
                             0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar table_1[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,
                           0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};

unsigned int num;

void delay(void)
{
unsigned int i,j;
for(i=0;i<240;i++)
  for(j=0;j<240;j++);
}
uchar read(void)
{
uchar i,j;
for(i=0;i<100;i++)
  for(j=0;j<240;j++)
  num++;
  if(num==9999)
  num=0;
  return num;
}
void main(void)
{
uchar i;
DDRA=0XFF;
PORTA=0XFF;

DDRD=0XFF;
PORTA |=0X03;
while(1)
{
  for(i=0;i<16;i++)
  {
   PORTD |=0X02; PORTA=table_1[i]; PORTD &=~0X02;
   PORTD |=0X01; PORTA=table[i];   PORTD &=~0X01;
   delay();
  }
}
}