51PWM5级调速

#include<reg52.h>
#define uint unsigned int 
#define uchar unsigned char 
sbit dianji=P1^5;
sbit jia_key=P3^0;//加速键
sbit jian_key=P3^1;//减速键
uchar num=0,show_num=1,gao_num=1,di_num=3;
uchar table_du[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar table_we[]={0,1,2,3,4,5,6};
void delay(uint t);
void display();
void key();//按键处理函数
void dispose();
void qudong();






void delay(uint t)
{
 uchar i;
 for(;t>0;t--);
  for(i=2645;i>0;i--);
}
void display()
{
 P2=table_we[0];
 P0=table_du[show_num];