单片机：K1开始流水 K2 全熄灭 K3从下到上依次点亮 来回

#include <reg52.h>
#include<intrins.h>
sbit key1=P3^2;
sbit key2=P3^3;
sbit key3=P3^4;
sbit key4=P3^5;
typedef  unsigned int uint;
typedef  unsigned char uchar;
void delay(uchar a)
{
uchar i;
while(a--)for(i=0;i<120;i++);
}
main()
{ 
    uchar led=0x7f;
    uchar flag=0;
    while (1)
    {
        if(key1==0)
        {
        delay(10);
        if(key1==0)
            {
            while(key1==0);
            flag=1;
            //led=0xfe;
            }
        }
    if(key2==0)
        {
        delay(10);
        if(key2==0)
            {
            while(key2==0);
            flag=2;
            }
        }
        if(key3==0)
        {
        delay(10);
        if(key3==0)
            {
            while(key3==0);
            flag=3;
            }
        }
    switch(flag)
        {
        case 1:P1=led;led=_cror_(led,1);delay(80);break;
        case 2:P1=0xff;break;
                case 3:P1=P1>>1;delay(80);
                                if (P1==0X00)
                                    P1=0XFF;
                                break;
        default:continue;
        }
    }
    
            
    }