TEMPER_L EQU 36H
TEMPER_H EQU 35H
TEMPER_d EQU 61H  ;小数位
TEMPER_NUM EQU 60H
FLAG1 BIT 00H
DQ BIT P2.2
dula bit P2.6;
wela bit P2.7;
bai_c equ 37h
sh_c  equ 38h
g_c   equ 39h

MOV SP,#70H

AAA:LCALL GET_TEMPER
LCALL TEMPER_COV
mov a,TEMPER_NUM            ;分开 TEMPER_NUM
anl a,#0f0h
swap a
mov bai_c,a
mov a,TEMPER_NUM
anl a,#0fh
mov sh_c,a
mov g_c,TEMPER_d

mov r2,#256
lplp:lcall display
djnz r2,lplp

LJMP AAA
NOP
;------------------读出转换后的温度值
GET_TEMPER: LCALL INIT_1820    ;初始化程序
SETB DQ ; 定时入口
BCD:
JB FLAG1,S22
LJMP BCD ; 若DS18B20不存在则返回

S22:LCALL DELAY1
MOV A,#0CCH ; 跳过ROM匹配------0CC
LCALL WRITE_1820
MOV A,#44H ; 发出温度转换命令
LCALL WRITE_1820
NOP
LCALL DELAY
LCALL DELAY
CBA:LCALL INIT_1820
JB FLAG1,ABC
LJMP CBA
ABC:LCALL DELAY1
MOV A,#0CCH ; 跳过ROM匹配
LCALL WRITE_1820
MOV A,#0BEH ; 发出读温度命令
LCALL WRITE_1820
LCALL READ_18200 ;或者 READ_1820
RET
;------------------读DS18B20的程序,从DS18B20中读出一个字节的数据
READ_1820:
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
WRITE_1820:
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
READ_18200:
MOV R4,#2 ; 将温度高位和低位从DS18B20中读出
MOV R1,#36H ; 低位存入36H(TEMPER_L),高位存入35H(TEMPER_H)
RE00:
MOV R2,#8
RE01:
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,RE01
MOV @R1,A
DEC R1
DJNZ R4,RE00
RET

;-------------------将从DS18B20中读出的温度数据进行转换
TEMPER_COV:

MOV A,#0F0H
ANL A,TEMPER_L ; 舍去温度低位中小数点后的四位温度数值
SWAP A
MOV TEMPER_NUM,A
MOV A,TEMPER_L
JNB ACC.3,TEMPER_COV1 ; 四舍五入去温度值
INC TEMPER_NUM

TEMPER_COV1:
MOV A,TEMPER_H
ANL A,#07H
SWAP A
ORL A,TEMPER_NUM
MOV TEMPER_NUM,A ; 保存变换后的温度数据
mov a,#0fh
ANL A,TEMPER_L

mov TEMPER_d,a
clr c
subb a,#10
jc jianlo
mov TEMPER_d,a
inc TEMPER_NUM

jianlo:
LCALL BIN_BCD
RET
;-------------------将16进制的温度数据转换成压缩BCD码
BIN_BCD:
MOV DPTR,#TEMP_TAB
MOV A,TEMPER_NUM
MOVC A,@A+DPTR
MOV TEMPER_NUM,A


RET

TEMP_TAB:
DB 00H,01H,02H,03H,04H,05H,06H,07H
DB 08H,09H,10H,11H,12H,13H,14H,15H
DB 16H,17H,18H,19H,20H,21H,22H,23H
DB 24H,25H,26H,27H,28H,29H,30H,31H
DB 32H,33H,34H,35H,36H,37H,38H,39H
DB 40H,41H,42H,43H,44H,45H,46H,47H
DB 48H,49H,50H,51H,52H,53H,54H,55H
DB 56H,57H,58H,59H,60H,61H,62H,63H
DB 64H,65H,66H,67H,68H,69H,70H,71H
DB 72H,73H,74H,75H,76H,77H,78H,79H
DB 80H,81H,82H,83H,84H,85H,86H,87H
DB 88H,89H,90H,91H,92H,93H,94H,95H
DB 96H,97H,98H,99H

;-------------------DS18B20初始化程序
INIT_1820:
SETB DQ
NOP
CLR DQ
MOV R0,#80H
TSR1:
DJNZ R0,TSR1 ; 延时
SETB DQ
MOV R0,#25H ;96US-25H
TSR2:
DJNZ R0,TSR2
JNB DQ,TSR3
LJMP TSR4 ; 延时
TSR3:
SETB FLAG1 ; 置标志位,表示DS1820存在
LJMP TSR5
TSR4:
CLR FLAG1 ; 清标志位,表示DS1820不存在
LJMP TSR7
TSR5:
MOV R0,#06BH ;200US
TSR6:
DJNZ R0,TSR6 ; 延时
TSR7:
SETB DQ
RET
;------------------重新写DS18B20暂存存储器设定值
;RE_CONFIG:
JB FLAG1,RE_CONFIG1 ; 若DS18B20存在,转RE_CONFIG1
RET
RE_CONFIG1:
MOV A,#0CCH ; 发SKIP ROM命令
LCALL WRITE_1820
MOV A,#4EH ; 发写暂存存储器命令
LCALL WRITE_1820

MOV A,#00H ; TH(报警上限)中写入00H
LCALL WRITE_1820
MOV A,#00H ; TL(报警下限)中写入00H
LCALL WRITE_1820
MOV A,#7FH ; 选择12位温度分辨率
LCALL WRITE_1820
RET
;------------------延时子程序
DELAY:MOV R7,#2H
MIN:DJNZ R7,YS500
RET
YS500:LCALL YS500US
LJMP MIN
YS500US:MOV R6,#200
DJNZ R6,$
RET
DELAY1:MOV R7,#20H
DJNZ R7,$
RET

display:			;显示程序
   MOV DPTR,#TABLE
   clr dula;
   mov a,bai_c
   MOVC a,@A+DPTR
   mov p0,a    		;显示百位
   setb dula;
   clr dula;

   clr wela;
   mov P0,#7eh;
   setb wela;
   clr wela;
   mov 50h,#5h
   call delayxms

   clr dula;
   mov a,sh_c
   MOVC a,@A+DPTR
   orl a,#80h         ;显示小数点
   mov p0,a ;		;显示十位
   setb dula;
   clr dula;

   clr wela;
   mov P0,#7dh;
   setb wela;
   clr wela;
   mov 50h,#5h
   call delayxms

   mov a,g_c
   MOVC a,@A+DPTR
   mov p0,a ;		;显示个位
   setb dula;
   clr dula;
   mov P0,#7bh;
   setb wela;
   clr wela;
   mov 50h,#5h
   call delayxms
   ret

delayxms:mov 52h,#1         ;50h,51h,52h用于延时  50h为参数x  延时1*x ms
delaya: mov 51h,#125
        djnz 51h,$
        djnz 52h,delaya
        djnz 50h,delayxms
        ret ;延时返回



table:db   3fh,06h,5bh,4fh,66h,6dh,7dh,07h,
      db   7fh,6fh,77h,7ch,39h,5eh,79h,71h