发表于：2004/8/13 12:48:00
#0楼
DS18B20的源程序，采用12位转换。
;***************
;Ds18b20_program 2003-1-3
;***************
TemperL EQU 8H
TemperH EQU TemperL+1
TemperDotL EQU TemperH+1
TemperDotH equ TemperDotL+1
TemperZer equ TemperDotH+1
Led1 equ TemperZer+1
led2 equ led1+1
led3 equ led2+1
DogL equ Led3+1
DogH equ DogL+1
SpData equ 22h
DogX equ 0 ;4Min
Ds18b20F BIT 00H
DQ BIT P3.7
led_1 bit p3.0
led_2 bit p3.1
led_3 bit p3.4
key_f bit p3.3
pnp1 bit p3.4
pnp2 bit p3.5
oRG 0000H; ;
sJMP start
ORG 0003H; ;
reti;
ORG 000BH ;
reti ;
ORG 0013H
reti ;
ORG 001BH ;
reti;aJMP T1 ;
ORG 0023H ;
RETI; AJMP RS_485 ;
;**************************************
start:
MOV R7,#7fh ;
MOV R0,#1 ;
CR: INC R0 ;
MOV @R0,#0 ;
djnz r7,cr ;CLR RAM
MOV SP,#SpData ;
;*****************
; MINI_Pragram
;*****************
; mov Dogl,#DogX
mov led1,#0fh
mov led2,#ff_led
mov led3,#ff_led
STAR_BI:
CALL GetTemper
CALL TemperDo
call led
djnz DogL ,Star_bi
; djnz DogH,Star_bi
mov p1,#0ffh
mov p3,#0ffh
mov Pcon,#02
sjmp Star_bi
;*******************
LED:
mov dptr,#led_asc
;***************************led1
mov a,led1
movc a,@a+dptr
call TurnAsc1
mov p1,a
clr led_1
call timer_1ms
setb led_1
;*************************led2
led_led2:
mov a,led2
movc a,@a+dptr
call TurnAsc
mov p1,a
clr led_2
call timer_1ms
setb led_2
;*************************led3
led_led3:
mov a,led3
movc a,@a+dptr
call TurnAsc
mov p1,a
clr led_3
call timer_1ms
setb led_3
led_end:
ret
;*************************
black equ 1Ch
l_led equ 11h
o_led equ 15h
u_led equ 1Bh
r_led equ 18h
QQ_led equ 1dh
p_led equ 16h
a_led equ 0ah
UU_led equ 1ah
s_led equ 19h
e_led equ 0eh
tt_led equ 1fh
ff_led equ 1eh
c_led equ 0ch
h_led equ 10h
b_led equ 0bh
d_led equ 0dh
f_led equ 0fh
nn_led equ 12h
n_led equ 13h
cc_led equ 2ah
oo_led equ 15h
rr_led equ 16h
dot_led equ 2bh
;"bafgecdh"
;*********************************************
; led=> / abcdefgh
led_asc:
db 11111100B;0
db 01100000B;1
db 11011010B;2
db 11110010B;3
db 01100110B;4
db 10110110B;5
db 10111110B;6
db 11100000B;7
db 11111110B;8
db 11110110B;9
DB 11101110B;a=>A
DB 00111110B;B=>B
DB 10011100B;C=>C
DB 01111010B;D=>D
DB 10011110B;E=>E
DB 10001110B;F=>F
DB 01101110B;H=>10H
DB 00011100B;L=>11H
DB 11101100B;N=>12H
db 00101010b;n=>13h
db 11111100b;O=>14h
dB 00111010B;o=>15H
DB 11001110B;P=>16H
DB 11100110B;Q=>17H
DB 00001010B;r=>18H
DB 10110110B;S=>19H
DB 01111100B;U=>1AH
DB 00111000B;u=>1BH
DB 00000000B;BLACK=>1CH
DB 11111111B;8.=>1DH
db 00000010b;-=>1Eh
db 00011110b;t=>1Fh
db 11111101B;0.=>20h
db 01100001B;1.
db 11011011B;2.
db 11110011B;3.
db 01100111B;4.
db 10110111B;5.
db 10111111B;6.
db 11100001B;7.
db 11111111B;8.
db 11110111B;9.=>29h
;************* add 2002.12.10
DB 11101111B;a.=>A
DB 00111111B;B.=>B
DB 10011101B;C.=>C
DB 01111011B;D.=>D
DB 10011111B;E.=>E
DB 10001111B;F.=>F
DB 01101111B;H.=>10H
DB 00011101B;L.=>11H
DB 11101101B;N.=>12H
db 00101011b;n.=>13h
db 11111101b;O.=>14h
dB 00111011B;o.=>15H
DB 11001111B;P.=>16H
DB 11100111B;Q.=>17H
DB 00001011B;r.=>18H
DB 10110111B;S.=>19H
DB 01111101B;U.=>1AH
DB 00111001B;u.=>1BH
DB 00000001B;BLACK.=>1CH
DB 11111111B;8.=>1DH
db 00000011b;-=>1Eh
db 00011111b;t=>1Fh
db ''li jie by 2002.12.24''
;*************************************
timer_1ms:
djnz b,$
djnz b,$
ret
;"bafgecdh"
;*********************************************
; led=> / abcdefgh ,bafgecdh
TurnAsc:
mov c,acc.0
mov b.0,c
mov c,acc.1
mov b.4,c
mov c,acc.2
mov b.5,c
mov c,acc.3
mov b.3,c
mov c,acc.4
mov b.1,c
mov c,acc.5
mov b.2,c
mov c,acc.6
mov b.7,c
mov c,acc.7
mov b.6,c
mov a,b
ret
;***************************
;abcdefgh=>bafhecdg
TurnAsc1:
mov c,acc.0
mov b.4,c
mov c,acc.1
mov b.0,c
mov c,acc.2
mov b.5,c
mov c,acc.3
mov b.3,c
mov c,acc.4
mov b.1,c
mov c,acc.5
mov b.2,c
mov c,acc.6
mov b.7,c
mov c,acc.7
mov b.6,c
mov a,b
ret
;******************
;读出转换后的温度值
GetTemper:
SkipDs18b20 equ 0cch
StartDs18b20 equ 44h
ReadDs equ 0beh
;***************************
SETB DQ ; 定时入口
call InitDs18b20
JB Ds18b20F,S22
ret
S22:call Delay64uS
MOV A,#SkipDs18b20 ; 跳过ROM匹配------0CC
call WriteByteDs1820
MOV A,#StartDs18b20 ; 发出温度转换命令
call WriteByteDs1820
call DELAY1s
call InitDs18b20
JB Ds18b20F,ABC
ret
ABC:call Delay64uS
MOV A,#SkipDs18b20 ; 跳过ROM匹配
call WriteByteDs1820
MOV A,#ReadDs ; 发出读温度命令
call WriteByteDs1820
call ReadDs18b20 ;READ_1820
RET
;------------------读DS18B20的程序,从DS18B20中读出一个字节的数据
ReadByteDs1820:
MOV R2,#8
RE1:
CLR C
SETB DQ
NOP
NOP
CLR DQ
NOP
NOP
NOP
SETB DQ
MOV R3,#7
DJNZ R3,$
MOV C,DQ
MOV R3,#23
DJNZ R3,$
RRC A
DJNZ R2,RE1
RET
;-------------------写DS18B20的程序
WriteByteDs1820:
MOV R2,#8
CLR C
WR1:
CLR DQ
MOV R3,#6
DJNZ R3,$
RRC A
MOV DQ,C
MOV R3,#23
DJNZ R3,$
SETB DQ
NOP
DJNZ R2,WR1
SETB DQ
RET
;-------------------读DS18B20的程序,从DS18B20中读出两个字节的温度数据
ReadDs18b20:
Call ReadByteDs1820
MOV TemperL,A
Call ReadByteDs1820
MOV TemperH,A
RET
;------------------重新写DS18B20暂存存储器设定值
RE_CONFIG:
JB Ds18b20F,RE_CONFIG1 ; 若DS18B20存在,转RE_CONFIG1
RET
RE_CONFIG1:
MOV A,#0CCH ; 发SKIP ROM命令
call WriteByteDs1820
MOV A,#4EH ; 发写暂存存储器命令
call WriteByteDs1820
MOV A,#00H ; TH(报警上限)中写入00H
;call WriteByteDs1820
MOV A,#00H ; TL(报警下限)中写入00H
;call WriteByteDs1820
MOV A,#7FH ; 选择12位温度分辨率
call WriteByteDs1820
RET
;------------------延时子程序
DELAY:
MOV R7,#00H
Dey1:
call led
DJNZ R7,Dey1
RET
Delay500uS:
MOV R6,#00H
DJNZ R6,$
RET
Delay64uS:
MOV R6,#20H
DJNZ R6,$
RET
;-------------------将从DS18B20中读出的温度数据进行转换
;2^3,2^2,2^1,2^0,2^-1,2^-2,2^-3,2^4 ;L
;SSSSSSS2^6,2^5,2^4;H
;************************
TemperD
JB Ds18b20F,Do1
ret
do1:
clr a
mov TemperDotL,a
mov TemperDotH,a
mov TemperZer,a
;*****************
mov a,TemperH
jnb acc.7,ZhenData ;>0
;<0
mov a,TemperL
cpl a
add a,#01 ;cpl+1
mov TemperL,a
mov a,TemperH
cpl a
addc a,#0
mov TemperH,a
ZhenData:
call FenLiDot
call FenLiZer
call HexToLed
call Led
ret
;**********************
FenLiZer:
mov a,TemperL
jnb acc.4,Fz1
mov a,#01
add a,TemperZer
mov TemperZer,a
Fz1:
mov a,TemperL
jnb acc.5,Fz2
mov a,#02
add a,TemperZer
mov TemperZer,a
Fz2:
mov a,TemperL
jnb acc.6,Fz3
mov a,#04
add a,TemperZer
mov TemperZer,a
Fz3:
mov a,TemperL
jnb acc.7,Fz4
mov a,#08
add a,TemperZer
mov TemperZer,a
Fz4:
mov a,TemperH;!!!!
jnb acc.0,Fz5
mov a,#16
add a,TemperZer
mov TemperZer,a
Fz5:
mov a,TemperH
jnb acc.1,Fz6
mov a,#32
add a,TemperZer
mov TemperZer,a
Fz6:
mov a,TemperH
jnb acc.2,Fz7
mov a,#64
add a,TemperZer
mov TemperZer,a
Fz7:
ret
;****************************
FenLiDot:
mov a,TemperL
jnb acc.3,Fen1 ;2^-1
mov r5,#low(5000)
mov r4,#High(5000)
call Add2
Fen1:
jnb acc.2,Fen2 ;2^-2
mov r5,#low(2500)
mov r4,#High(2500)
call Add2
Fen2:
jnb acc.1,Fen3 ;2^-3
mov r5,#low(1250)
mov r4,#High(1250)
call Add2
Fen3:
jnb acc.0,Fen4 ;2^-4
mov r5,#low(625)
mov r4,#High(625)
call Add2
Fen4:
ret
;****************
;TemperDorHL+r4r5=r2r3
;*****************
Add2:
push a
mov a,TemperDotL
add a,r5
mov TemperDotL,a
mov a,TemperDotH
addc a,r4
mov TemperDotH,a
pop a
ret
;***********************
; D=>BCD_16
;***********************
bcd_16: clr a ;in:r3r2[16 bdata]
mov r4,a ;R6,r5,r4[5 bcddata]
mov r5,a
mov R6,a
mov R7,#10h
lp0: clr c
mov a,r2
rlc a
mov r2,a
mov a,r3
rlc a
mov r3,a
mov a,r4
addc a,r4
da a
mov r4,a
mov a,r5
addc a,r5
da a
mov r5,a
mov a,R6
addc a,R6
da a
mov R6,a
djnz R7,lp0
ret
;************************
HexToLed:
mov r3,TemperDotH
mov r2,TemperDotL
call Bcd_16 ;r3r2(in)=>r6r5r4(out)
mov a,r5
anl a,#0f0h
swap a
mov led3,a
mov a,r5
anl a,#0fh
cjne a,#05,He1
;>=0.5
He2:
inc led3
sjmp He3
He1:
jnc He2
;******* Zer To Bcd
He3:
;***************************
mov a,TemperZer
mov b,#10
div ab ;a.b
mov led1,a
jnz He4
mov led1,#black
He4:
mov a,b
add a,#20h ;Add Dot
mov led2,a
ret
;***************
Delay1S:
mov b,#130
Dela11:
push b
call Led
call Led
pop b
djnz b,Dela11
ret
;-------------------DS18B20初始化程序
InitDs18b20:
CLR DQ
MOV R7,#80h
DJNZ R7,$ ; 延时
SETB DQ
MOV R7,#25h ;
DJNZ R7,$
SETB Ds18b20F ; 置标志位,表示DS1820存在
JNB DQ,TSR5
CLR Ds18b20F ; 清标志位,表示DS1820不存在
Jmp TSR7
TSR5:
MOV R7,#06BH ;200US
DJNZ R7,$ ; 延时
TSR7:
SETB DQ
RET
;***************
;Ds18b20_program 2003-1-3
;***************
TemperL EQU 8H
TemperH EQU TemperL+1
TemperDotL EQU TemperH+1
TemperDotH equ TemperDotL+1
TemperZer equ TemperDotH+1
Led1 equ TemperZer+1
led2 equ led1+1
led3 equ led2+1
DogL equ Led3+1
DogH equ DogL+1
SpData equ 22h
DogX equ 0 ;4Min
Ds18b20F BIT 00H
DQ BIT P3.7
led_1 bit p3.0
led_2 bit p3.1
led_3 bit p3.4
key_f bit p3.3
pnp1 bit p3.4
pnp2 bit p3.5
oRG 0000H; ;
sJMP start
ORG 0003H; ;
reti;
ORG 000BH ;
reti ;
ORG 0013H
reti ;
ORG 001BH ;
reti;aJMP T1 ;
ORG 0023H ;
RETI; AJMP RS_485 ;
;**************************************
start:
MOV R7,#7fh ;
MOV R0,#1 ;
CR: INC R0 ;
MOV @R0,#0 ;
djnz r7,cr ;CLR RAM
MOV SP,#SpData ;
;*****************
; MINI_Pragram
;*****************
; mov Dogl,#DogX
mov led1,#0fh
mov led2,#ff_led
mov led3,#ff_led
STAR_BI:
CALL GetTemper
CALL TemperDo
call led
djnz DogL ,Star_bi
; djnz DogH,Star_bi
mov p1,#0ffh
mov p3,#0ffh
mov Pcon,#02
sjmp Star_bi
;*******************
LED:
mov dptr,#led_asc
;***************************led1
mov a,led1
movc a,@a+dptr
call TurnAsc1
mov p1,a
clr led_1
call timer_1ms
setb led_1
;*************************led2
led_led2:
mov a,led2
movc a,@a+dptr
call TurnAsc
mov p1,a
clr led_2
call timer_1ms
setb led_2
;*************************led3
led_led3:
mov a,led3
movc a,@a+dptr
call TurnAsc
mov p1,a
clr led_3
call timer_1ms
setb led_3
led_end:
ret
;*************************
black equ 1Ch
l_led equ 11h
o_led equ 15h
u_led equ 1Bh
r_led equ 18h
QQ_led equ 1dh
p_led equ 16h
a_led equ 0ah
UU_led equ 1ah
s_led equ 19h
e_led equ 0eh
tt_led equ 1fh
ff_led equ 1eh
c_led equ 0ch
h_led equ 10h
b_led equ 0bh
d_led equ 0dh
f_led equ 0fh
nn_led equ 12h
n_led equ 13h
cc_led equ 2ah
oo_led equ 15h
rr_led equ 16h
dot_led equ 2bh
;"bafgecdh"
;*********************************************
; led=> / abcdefgh
led_asc:
db 11111100B;0
db 01100000B;1
db 11011010B;2
db 11110010B;3
db 01100110B;4
db 10110110B;5
db 10111110B;6
db 11100000B;7
db 11111110B;8
db 11110110B;9
DB 11101110B;a=>A
DB 00111110B;B=>B
DB 10011100B;C=>C
DB 01111010B;D=>D
DB 10011110B;E=>E
DB 10001110B;F=>F
DB 01101110B;H=>10H
DB 00011100B;L=>11H
DB 11101100B;N=>12H
db 00101010b;n=>13h
db 11111100b;O=>14h
dB 00111010B;o=>15H
DB 11001110B;P=>16H
DB 11100110B;Q=>17H
DB 00001010B;r=>18H
DB 10110110B;S=>19H
DB 01111100B;U=>1AH
DB 00111000B;u=>1BH
DB 00000000B;BLACK=>1CH
DB 11111111B;8.=>1DH
db 00000010b;-=>1Eh
db 00011110b;t=>1Fh
db 11111101B;0.=>20h
db 01100001B;1.
db 11011011B;2.
db 11110011B;3.
db 01100111B;4.
db 10110111B;5.
db 10111111B;6.
db 11100001B;7.
db 11111111B;8.
db 11110111B;9.=>29h
;************* add 2002.12.10
DB 11101111B;a.=>A
DB 00111111B;B.=>B
DB 10011101B;C.=>C
DB 01111011B;D.=>D
DB 10011111B;E.=>E
DB 10001111B;F.=>F
DB 01101111B;H.=>10H
DB 00011101B;L.=>11H
DB 11101101B;N.=>12H
db 00101011b;n.=>13h
db 11111101b;O.=>14h
dB 00111011B;o.=>15H
DB 11001111B;P.=>16H
DB 11100111B;Q.=>17H
DB 00001011B;r.=>18H
DB 10110111B;S.=>19H
DB 01111101B;U.=>1AH
DB 00111001B;u.=>1BH
DB 00000001B;BLACK.=>1CH
DB 11111111B;8.=>1DH
db 00000011b;-=>1Eh
db 00011111b;t=>1Fh
db ''li jie by 2002.12.24''
;*************************************
timer_1ms:
djnz b,$
djnz b,$
ret
;"bafgecdh"
;*********************************************
; led=> / abcdefgh ,bafgecdh
TurnAsc:
mov c,acc.0
mov b.0,c
mov c,acc.1
mov b.4,c
mov c,acc.2
mov b.5,c
mov c,acc.3
mov b.3,c
mov c,acc.4
mov b.1,c
mov c,acc.5
mov b.2,c
mov c,acc.6
mov b.7,c
mov c,acc.7
mov b.6,c
mov a,b
ret
;***************************
;abcdefgh=>bafhecdg
TurnAsc1:
mov c,acc.0
mov b.4,c
mov c,acc.1
mov b.0,c
mov c,acc.2
mov b.5,c
mov c,acc.3
mov b.3,c
mov c,acc.4
mov b.1,c
mov c,acc.5
mov b.2,c
mov c,acc.6
mov b.7,c
mov c,acc.7
mov b.6,c
mov a,b
ret
;******************
;读出转换后的温度值
GetTemper:
SkipDs18b20 equ 0cch
StartDs18b20 equ 44h
ReadDs equ 0beh
;***************************
SETB DQ ; 定时入口
call InitDs18b20
JB Ds18b20F,S22
ret
S22:call Delay64uS
MOV A,#SkipDs18b20 ; 跳过ROM匹配------0CC
call WriteByteDs1820
MOV A,#StartDs18b20 ; 发出温度转换命令
call WriteByteDs1820
call DELAY1s
call InitDs18b20
JB Ds18b20F,ABC
ret
ABC:call Delay64uS
MOV A,#SkipDs18b20 ; 跳过ROM匹配
call WriteByteDs1820
MOV A,#ReadDs ; 发出读温度命令
call WriteByteDs1820
call ReadDs18b20 ;READ_1820
RET
;------------------读DS18B20的程序,从DS18B20中读出一个字节的数据
ReadByteDs1820:
MOV R2,#8
RE1:
CLR C
SETB DQ
NOP
NOP
CLR DQ
NOP
NOP
NOP
SETB DQ
MOV R3,#7
DJNZ R3,$
MOV C,DQ
MOV R3,#23
DJNZ R3,$
RRC A
DJNZ R2,RE1
RET
;-------------------写DS18B20的程序
WriteByteDs1820:
MOV R2,#8
CLR C
WR1:
CLR DQ
MOV R3,#6
DJNZ R3,$
RRC A
MOV DQ,C
MOV R3,#23
DJNZ R3,$
SETB DQ
NOP
DJNZ R2,WR1
SETB DQ
RET
;-------------------读DS18B20的程序,从DS18B20中读出两个字节的温度数据
ReadDs18b20:
Call ReadByteDs1820
MOV TemperL,A
Call ReadByteDs1820
MOV TemperH,A
RET
;------------------重新写DS18B20暂存存储器设定值
RE_CONFIG:
JB Ds18b20F,RE_CONFIG1 ; 若DS18B20存在,转RE_CONFIG1
RET
RE_CONFIG1:
MOV A,#0CCH ; 发SKIP ROM命令
call WriteByteDs1820
MOV A,#4EH ; 发写暂存存储器命令
call WriteByteDs1820
MOV A,#00H ; TH(报警上限)中写入00H
;call WriteByteDs1820
MOV A,#00H ; TL(报警下限)中写入00H
;call WriteByteDs1820
MOV A,#7FH ; 选择12位温度分辨率
call WriteByteDs1820
RET
;------------------延时子程序
DELAY:
MOV R7,#00H
Dey1:
call led
DJNZ R7,Dey1
RET
Delay500uS:
MOV R6,#00H
DJNZ R6,$
RET
Delay64uS:
MOV R6,#20H
DJNZ R6,$
RET
;-------------------将从DS18B20中读出的温度数据进行转换
;2^3,2^2,2^1,2^0,2^-1,2^-2,2^-3,2^4 ;L
;SSSSSSS2^6,2^5,2^4;H
;************************
TemperD
JB Ds18b20F,Do1
ret
do1:
clr a
mov TemperDotL,a
mov TemperDotH,a
mov TemperZer,a
;*****************
mov a,TemperH
jnb acc.7,ZhenData ;>0
;<0
mov a,TemperL
cpl a
add a,#01 ;cpl+1
mov TemperL,a
mov a,TemperH
cpl a
addc a,#0
mov TemperH,a
ZhenData:
call FenLiDot
call FenLiZer
call HexToLed
call Led
ret
;**********************
FenLiZer:
mov a,TemperL
jnb acc.4,Fz1
mov a,#01
add a,TemperZer
mov TemperZer,a
Fz1:
mov a,TemperL
jnb acc.5,Fz2
mov a,#02
add a,TemperZer
mov TemperZer,a
Fz2:
mov a,TemperL
jnb acc.6,Fz3
mov a,#04
add a,TemperZer
mov TemperZer,a
Fz3:
mov a,TemperL
jnb acc.7,Fz4
mov a,#08
add a,TemperZer
mov TemperZer,a
Fz4:
mov a,TemperH;!!!!
jnb acc.0,Fz5
mov a,#16
add a,TemperZer
mov TemperZer,a
Fz5:
mov a,TemperH
jnb acc.1,Fz6
mov a,#32
add a,TemperZer
mov TemperZer,a
Fz6:
mov a,TemperH
jnb acc.2,Fz7
mov a,#64
add a,TemperZer
mov TemperZer,a
Fz7:
ret
;****************************
FenLiDot:
mov a,TemperL
jnb acc.3,Fen1 ;2^-1
mov r5,#low(5000)
mov r4,#High(5000)
call Add2
Fen1:
jnb acc.2,Fen2 ;2^-2
mov r5,#low(2500)
mov r4,#High(2500)
call Add2
Fen2:
jnb acc.1,Fen3 ;2^-3
mov r5,#low(1250)
mov r4,#High(1250)
call Add2
Fen3:
jnb acc.0,Fen4 ;2^-4
mov r5,#low(625)
mov r4,#High(625)
call Add2
Fen4:
ret
;****************
;TemperDorHL+r4r5=r2r3
;*****************
Add2:
push a
mov a,TemperDotL
add a,r5
mov TemperDotL,a
mov a,TemperDotH
addc a,r4
mov TemperDotH,a
pop a
ret
;***********************
; D=>BCD_16
;***********************
bcd_16: clr a ;in:r3r2[16 bdata]
mov r4,a ;R6,r5,r4[5 bcddata]
mov r5,a
mov R6,a
mov R7,#10h
lp0: clr c
mov a,r2
rlc a
mov r2,a
mov a,r3
rlc a
mov r3,a
mov a,r4
addc a,r4
da a
mov r4,a
mov a,r5
addc a,r5
da a
mov r5,a
mov a,R6
addc a,R6
da a
mov R6,a
djnz R7,lp0
ret
;************************
HexToLed:
mov r3,TemperDotH
mov r2,TemperDotL
call Bcd_16 ;r3r2(in)=>r6r5r4(out)
mov a,r5
anl a,#0f0h
swap a
mov led3,a
mov a,r5
anl a,#0fh
cjne a,#05,He1
;>=0.5
He2:
inc led3
sjmp He3
He1:
jnc He2
;******* Zer To Bcd
He3:
;***************************
mov a,TemperZer
mov b,#10
div ab ;a.b
mov led1,a
jnz He4
mov led1,#black
He4:
mov a,b
add a,#20h ;Add Dot
mov led2,a
ret
;***************
Delay1S:
mov b,#130
Dela11:
push b
call Led
call Led
pop b
djnz b,Dela11
ret
;-------------------DS18B20初始化程序
InitDs18b20:
CLR DQ
MOV R7,#80h
DJNZ R7,$ ; 延时
SETB DQ
MOV R7,#25h ;
DJNZ R7,$
SETB Ds18b20F ; 置标志位,表示DS1820存在
JNB DQ,TSR5
CLR Ds18b20F ; 清标志位,表示DS1820不存在
Jmp TSR7
TSR5:
MOV R7,#06BH ;200US
DJNZ R7,$ ; 延时
TSR7:
SETB DQ
RET
[此贴子已经被思南于2004-8-15 23:17:41编辑过]