org 0000h
start: mov a,#0ffh
mov p1,a ;p1口置高电平
mov p2,a ;p2口置高电平
mov r2,#0feh
mov r3,#0h
next: mov a,p2 ;是否键被按下
cjne a,#0ffh,dlay0
ljmp next
dlay0: mov r1,#0ffh ;消除开关抖动
djnz r1,$
mov a,p2
cjne a,#0ffh,disply
ljmp next
disply: mov p1,r2
cjne r3,#1h,left ;确定是否向左移
right: mov a,r2
rr a
mov r2,a
cjne r2,#0feh,chgl
acall delay
ljmp disply
left: mov a,r2 ;把位向左移一位
rl a
mov r2,a
cjne r2,#7fh,chgr ;比较是否p1.7亮
acall delay
chgl: mov r3,#1h
acall delay
ljmp disply
chgr: mov r3,#0h
acall delay
ljmp disply
delay: mov r4,#0ffh
d1: mov r5,#0ffh
d2: mov r6,#6h
dl3: djnz r6,dl3 `
djnz r5,d2
djnz r4,d1
RET
END
p1.0-p1.7接发光二极管，低电平时亮，开关接在p2.0上，想通过开关控制流水灯，目标是让二极管从1亮到7再从7亮到1,在keic中编译总有错误，显示标号为dl3的程序有语法错误，
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