Question

单片机控制流水灯的程序

Answer 1

#include <reg52.h>
void delay(unsigned int cnt)
{
while(--cnt);
}
main()
{
P1=0xfe;//给初始化值
while(1)
{
delay(30000);
P1<<=1;//左移一位
P1|=0x01;//最后一位补1
if(P1==0x7f)
{
delay(30000);
P1=0xfe;
}
}
}

Answer 2

org 0000h
ajmp main
org 0030h
main:
mov a,#0FEH
LOOP :
MOV P1,A
ACALL DELAY
RL A
AJMP LOOP
DELAY:
MOV R7,#100
D_LOOP2 :
MOV R6,#255
D_LOOP1:
MOV R5,#255

DJNZ R5,$
DJNZ R6,D_LOOP1
DJNZ R7,D_LOOP2

RET
END

Answer 3

#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
uchar temp;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void main()
{
P1=0xfe;
temp=P1;
while(1)
{
temp=_crol_(temp,1);
P1=temp;
delay(50);
}
}