將以下改成簡單的匯編語言，并標上備注
- #include<reg52.h>
- sbit KEY0=P0^0;
- sbit KEY1=P0^1;
- sbit KEY2=P0^2;
- sbit KEY3=P0^3;
- sbit KEY4=P0^4;
- unsigned chara[]={0x01,0x02,0x04,0x08};
- unsigned charb[]={0x08,0x04,0x02,0x01};
- unsigned charc[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8};
- unsigned chari,s=0,f=0;
- unsigned chark=200;
- unsigned char l=4;
- voiddelay(unsigned int t)
- {
- unsigned char j,b;
- b=t;
- while(b--)
- {
- for (j=0;j<125;j++);
- }
- }
- void key()
- {P0=0x1f;
- if(P0!=0x1f)
- {delay(30);
- if(P0!=0x1f)
- {delay(30);
- if(KEY0==0)
- {s=1;}
- if(KEY1==0)
- {f=1;}
- if(KEY4==0)
- {s=0;
- f=0;}
- if(KEY2==0)
- {if(l>1)
- l--;}
- if(KEY3==0)
- {if(l<7)
- l++;}
- }}
- }
- void speed()
- {switch(l)
- {case 7:k=50;P1=c[l];break;
- case6:k=100;P1=c[l];break;
- case5:k=150;P1=c[l];break;
- case4:k=200;P1=c[l];break;
- case3:k=250;P1=c[l];break;
- case2:k=300;P1=c[l];break;
- case1:k=350;P1=c[l];break;}
- }
- void main()
- {
- while(1)
- {key();
- while(s>0)
- {speed();
- for(i=0;i<4;i++)
- {
- P2=b[i];
- delay(k);
- key();
- }
- delay(100);
- key();
- }
-
- while(f>0)
- {speed();
- for(i=0;i<4;i++)
- {
- P2=a[i];
- delay(k);
- key();
- }
- delay(100);
- key();
- }
- }
- }
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