; DS18B20温度控制数码管显示(汇编非常详细)*;* 1、P1.6= → 进入设定温度报警值TL 状态:*;* L－－20*;* 2、P1.6 → 进入设定温度报警值TH 状态:*;* H－－28*;* 3、P1.6 → 返回*;* 4、设定过程：P1.4 →加键（UP），P1.5 →减键（DOWN），可快速调。

* ;***TIMER_L DATA 23HTIMER_H DATA 24HTIMER_COUN DATA 25HTEMPL DATA 26HTEMPH DATA 27HTEMP_TH DATA 28HTEMP_TL DATA 29HTEMPHC DATA 2AHTEMPLC DATA 2BHTEMP_ZH DATA 2CHBEEP EQU P3.7DATA_LINE EQU P3.3RELAY EQU P1.3FLAG1 EQU 20H.0FLAG2 EQU 20H.1;-------------------------------------------------K1 EQU P1.4K2 EQU P1.5K3 EQU P1.6K4 EQU P1.7;=================================================ORG 0000HJMP MAINORG 000BHAJMP INT_T0;--------------------------------------------------MAIN: MOV SP,#30HMOV TMOD,#01H ;T0,方式1MOV TIMER_L,#00H ;50ms定时值MOV TIMER_H,#4CHMOV TIMER_COUN,#00H ;中断计数MOV IE,#82H ;EA=1,ET0=1LCALL READ_E2;LCALL RE_18B20MOV 20H,#00HSETB BEEPSETB RELAYMOV 7FH,#0AH ;熄灭符CALL RESET ;复位与检测DS18B20JNB FLAG1,MAIN1 ;FLAG1=0，DS18B20不存在JMP STARTMAIN1: CALL RESETJB FLAG1,STARTLCALL BEEP_BL ;DS18B20错误，报警JMP MAIN1START:MOV A,#0CCH ; 跳过ROM匹配CALL WRITEMOV A,#044H ; 发出温度转换命令CALL WRITECALL RESETMOV A,#0CCH ; 跳过ROM匹配CALL WRITEMOV A,#0BEH ; 发出读温度命令CALL WRITECALL READ ;读温度数据CALL CONVTEMPCALL DISPBCDCALL DISP1CALL SCANKEYLCALL TEMP_COMPJMP MAIN1;=====================================================;DS18B20 复位与检测子程序;FLAG1=1 OK, FLAG1=0 ERROR;======================================================RESET:SETB DA TA_LINENOPCLR DATA_LINEMOV R0,#64H ;主机发出延时600微秒的复位低脉冲MOV R1,#03HRESET1: DJNZ R0,$MOV R0,#64HDJNZ R1,RESET1SETB DA TA_LINE ;然后拉高数据线NOPMOV R0,#25HRESET2: JNB DA TA_LINE,RESET3 ;等待DS18B20回应DJNZ R0,RESET2JMP RESET4 ; 延时RESET3: SETB FLAG1 ; 置标志位,表示DS1820存在JMP RESET5RESET4: CLR FLAG1 ; 清标志位,表示DS1820不存在JMP RESET6RESET5: MOV R0,#064HDJNZ R0,$ ; 时序要求延时一段时间RESET6: SETB DATA_LINERET;===========================================================;;=========================================================== WRITE: MOV R2,#8 ;一共8位数据CLR CYWR1:CLR DATA_LINE ;开始写入DS18B20总线要处于复位（低）状态MOV R3,#09DJNZ R3,$ ;总线复位保持18微妙以上RRC A ;把一个字节DA TA 分成8个BIT环移给CMOV DATA_LINE,C ;写入一个BITMOV R3,#23DJNZ R3,$ ;等待46微妙SETB DA TA_LINE ;重新释放总线NOPDJNZ R2,WR1 ;写入下一个BITSETB DA TA_LINERET;============================================================ ;从DS18B20中读出温度低位、高位和报警值TH、TL;存入26H、27H、28H、29H;============================================================ READ: MOV R4,#4 ; 将温度高位和低位从DS18B20中读出MOV R1,#26H ; 存入26H、27H、28H、29HRE00: MOV R2,#8RE01: CLR CSETB DATA_LINENOPNOPCLR DA TA_LINE ;读前总线保持为低NOPNOPNOPSETB DATA_LINE ;开始读总线释放MOV R3,#09 ;延时18微妙DJNZ R3,$MOV C,DATA_LINE ;从DS18B20总线读得一个BITMOV R3,#23DJNZ R3,$ ;等待46微妙RRC A ;把读得的位值环移给ADJNZ R2,RE01 ;读下一个BITMOV @R1,AINC R1DJNZ R4,RE00RET;--------------------------------------------;200ms对闪动标记取反一次;--------------------------------------------INT_T0:PUSH ACCPUSH PSWMOV TL0,TIMER_LMOV TH0,TIMER_HINC TIMER_COUNMOV A,TIMER_COUNCJNE A,#04H,INT_ENDMOV TIMER_COUN,#00HCPL FLAG2INT_END:POP PSWPOP ACCRETI;========================================================== ;重新对DS18B20 初始化;将设定的温度报警值写入DS18B20;========================================================== RE_18B20:JB FLAG1,RE_18B20ARETRE_18B20A:CALL RESETMOV A,#0CCH ;跳过ROM匹配LCALL WRITEMOV A,#4EH ;写暂存寄存器LCALL WRITEMOV A,TEMP_TH ;TH(报警上限）LCALL WRITEMOV A,TEMP_TL ;TL(报警下限）LCALL WRITEMOV A,#7FH ;12位精确度LCALL WRITERET;====================================================;功能键扫描子程序;==================================================== SCANKEY:MOV P1,#0F0HJB K1,SCAN_K2CALL BEEP_BLSCAN_K1: CALL ALERT_TLCALL ALERT_PLAYJB K1,SCAN_K1CALL BEEP_BLSCAN_K11: CALL ALERT_THCALL ALERT_PLAYJB K1,SCAN_K11CALL BEEP_BLSCAN_K2: JB K2,SCAN_K3CALL BEEP_BLSCAN_K3: JB K3,SCAN_K4CALL BEEP_BLLCALL RESET_ALERTLCALL RE_18B20LCALL WRITE_E2SCAN_K4: JB K4,SCAN_ENDCALL BEEP_BLSCAN_END: RET;================================================ ;设置温度报警值;================================================ RESET_ALERT:CALL ALERT_TLCALL ALERT_PLAYJNB K3,$ ;K3为位移键SETB TR0RESET_TL:CALL ALERT_PLAYJNB FLAG2,R_TL01mov 75H,7fh ;送入熄灭符mov 76H,7fhCALL ALERT_PLAYJMP R_TL02R_TL01: CALL ALERT_TLmov 75h,7Eh ;送设定值mov 76h,7DhCALL ALERT_PLAY ;显示设定值R_TL02: JNB K1,K011AJNB K2,K011BJNB K3,RESET_THJMP RESET_TLK011A:INC TEMP_TLMOV A,TEMP_TLCJNE A,#120,K012A ;没有到设定上限值，转MOV TEMP_TL,#0K012A: CALL TL_DELJMP RESET_TLK011B:DEC TEMP_TLMOV A,TEMP_TLCJNE A,#00H,K012B ;没有到设定下限值，转MOV TEMP_TL,#119K012B: CALL TL_DELJMP RESET_TL;-------------------------------------------------------RESET_TH:CALL BEEP_BLJNB K3,$RESET_TH1:CALL ALERT_PLAYJNB FLAG2,R_TH01mov 75H,7fh ;送入熄灭符mov 76H,7fhCALL ALERT_PLAYJMP R_TH02R_TH01: CALL ALERT_THmov 75h,7Eh ;mov 76h,7DhCALL ALERT_PLAYR_TH02: JNB K1,K021AJNB K2,K021BJNB K3,K002JMP RESET_TH1K021A:INC TEMP_THMOV A,TEMP_THCJNE A,#120,K022A ;没有到设定上限值，转MOV TEMP_TH,#0K022A: CALL TH_DELJMP RESET_TH1K021B:DEC TEMP_TH ;减1MOV A,TEMP_THCJNE A,#00H,K022B ;没有到设定下限值，转MOV TEMP_TH,#119K022B: CALL TH_DELJMP RESET_TH1K002: CALL BEEP_BLCLR TR0 ;关闭中断RET;-----------------------------------------------------;键延时子程序;多次调用报警值显示程序来延时;-----------------------------------------------------TL_DEL: ;报警低值延时MOV R2,#0AHTL_DEL1: CALL ALERT_TLCALL ALERT_PLAYDJNZ R2,TL_DEL1RETTH_DEL: ;报警高值延时MOV R2,#0AHTH_DEL1: CALL ALERT_THCALL ALERT_PLAYDJNZ R2,TH_DEL1RET;==================================================== ;实时温度值与设定报警温度值TH、TL 比较子程序;当实际温度大于TH 的设定值时，显示“H”，继电器关闭。