1.代码：
#include <reg52.h>
typedef unsigned char u8;
typedef unsigned int u16;
sbit seg_sel = P1^4;
sbit bit_sel = P1^5;
#define DATA P0
//code 在程序编译的时候 当作代买直接
u8 code seg_tab[]={
0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,
0x80,0x90,0x88,0x83,
0xc6,0xa1,0x86,0x8e
};
u8 code bit_tab[]={
0x10,0x20,0x40,0x80,
0x01,0x02,0x04,0x08
};
void delay(u16 num)
{
u16 x,y;
for(x=num; x>0; x--)
for(y=110; y>0; y--)
{
;//延时1ms
}
}
void display_led(u8 which_bit, u8 which_number)
{
bit_sel = 1;//Q[7..0]=D[7..0]
DATA = bit_tab[which_bit];
bit_sel = 0;//BIT[7..0]=0x80
delay(120);
seg_sel = 1;//Q[7..0]=D[7..0]
DATA = seg_tab[which_number];
seg_sel = 0;
delay(120);
}
void main (void)
{
u8 num;
P0 = 0xff;
P1 = 0xff;//端口初始化
seg_sel = 0;//LE禁止锁存
bit_sel = 0;
while (1)
{
//8 个灯都亮
for(num=8; num>=1; num--)
display_led(num, 5);
}
}
2.电路图：
3.效果：
