现在用AT89C51 跟MT8880做电话自动拨号,可拨不出去,我并上一个电话能听到拨号音,但交换机无法识别,拨不出去!!
电路图在底下,请问该怎么改????
程序如下:speak equ p2.3 ;叫声 clr speak 时叫
tel equ p2.6 ;摘挂机控制
red equ p2.0
cs equ p1.2 ;片选
gree equ p2.1
have equ p1.1 ;拨号触发
yellow equ p2.2
org 0000h
ajmp star
org 0030h
;********初始化
star:
clr have
clr tel
;***********
main:
;jnb p1.0,putup
jb have,putup ;P1.1高电平拨号
setb speak;关声音
setb yellow
setb red
sjmp main
;*************
putup:
clr speak
setb tel ;摘机
acall delay2;停3秒
acall reset
mov a,#20h ;拨号码2
mov p0,a
acall delay ;停100ms后
acall delay ;
mov a,#0a0h ;拨号码0
mov p0,a
acall delay ;停100ms后
acall delay ;
mov a,#10h ;拨号码1
mov p0,a
acall delay ;停100ms后
acall delay ;
acall delay2
acall delay2
acall delay2
acall delay2
acall delay2
clr tel ;挂机
ljmp main
;*********************************8
;*********88
reset: ;**********初始化MT8880
mov a,#0d8h
mov p0,a ;写入控制寄存器CRA 1001 （并设下个周期写CRB)
acall delay ;必须停
mov a,#08h ;写CRB 0000
mov p0,a
acall delay
ret
;********88888
;**************delay:
delay:
loop3:mov r1,#150
loop:mov r2,#153
loop2:djnz r2,loop2
djnz r1,loop
ret
;停4秒
delay2:
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
ret
end
相关链接:https://bbs.21ic.com/upfiles/img/20095/2009527203231138.pdf |
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