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1、DS18B20汇编程序,1602液晶显示TEMPER_LEQU36HTEMPER_HEQU35HTEMPER_NUMEQU60HFLAG1BIT00HDQBITP3.3RSEQUP3.7;RS<---->P2.0RWEQUP3.6;R/W<--->P2.1EEQUP3.5;E<----->P2.2LCD_DBEQUP1AAA:MOVSP,#70HLCALLGET_TEMPERLCALLTEMPER_COVLCALLDISPLAY;调用显示子程序LJMPAAANOP;------------------读出转换后的温度值GET_TEMPER:SETBDQ;定时入口BCD:LCALL
2、INIT_1820JBFLAG1,S22LJMPCC;若DS18B20不存在则返回S22:LCALLDELAY1MOVA,#0CCH;跳过ROM匹配------0CCLCALLWRITE_1820MOVA,#44H;发出温度转换命令LCALLWRITE_1820NOPLCALLDELAYLCALLDELAYCBA:LCALLINIT_1820JBFLAG1,ABCLJMPCBAABC:LCALLDELAY1MOVA,#0CCH;跳过ROM匹配LCALLWRITE_1820MOVA,#0BEH;发出读温度命令LCALLWRITE_1820LCALLREAD_18200;READ_1
3、820RET;------------------读DS18B20的程序,从DS18B20中读出一个字节的数据READ_1820:MOVR2,#8RE1:CLRCSETBDQNOPNOPCLRDQNOPNOPNOPSETBDQMOVR3,#7DJNZR3,$MOVC,DQMOVR3,#23DJNZR3,$RRCADJNZR2,RE1RET;-------------------写DS18B20的程序WRITE_1820:MOVR2,#8CLRCWR1:CLRDQMOVR3,#6DJNZR3,$RRCAMOVDQ,CMOVR3,#23DJNZR3,$SETBDQNOPDJNZR2,
4、WR1SETBDQRET;-------------------读DS18B20的程序,从DS18B20中读出两个字节的温度数据READ_18200:MOVR4,#2;将温度高位和低位从DS18B20中读出MOVR1,#36H;低位存入36H(TEMPER_L),高位存入35H(TEMPER_H)RE00:MOVR2,#8RE01:CLRCSETBDQNOPNOPCLRDQNOPNOPNOPSETBDQMOVR3,#7DJNZR3,$MOVC,DQMOVR3,#23DJNZR3,$RRCADJNZR2,RE01MOV@R1,ADECR1DJNZR4,RE00RET;-------
5、------------将从DS18B20中读出的温度数据进行转换TEMPER_COV:MOVA,#0F0HANLA,TEMPER_L;舍去温度低位中小数点后的四位温度数值SWAPAMOVTEMPER_NUM,AMOVA,TEMPER_LJNBACC.3,TEMPER_COV1;四舍五入去温度值INCTEMPER_NUMTEMPER_COV1:MOVA,TEMPER_HANLA,#07HSWAPAORLA,TEMPER_NUMMOVTEMPER_NUM,A;保存变换后的温度数据LCALLBIN_BCDRET;-------------------将16进制的温度数据转换成压缩BC
6、D码BIN_BCD:MOVDPTR,#TEMP_TABMOVA,TEMPER_NUMMOVCA,@A+DPTRMOVTEMPER_NUM,ARETTEMP_TAB:DB00H,01H,02H,03H,04H,05H,06H,07HDB08H,09H,10H,11H,12H,13H,14H,15HDB16H,17H,18H,19H,20H,21H,22H,23HDB24H,25H,26H,27H,28H,29H,30H,31HDB32H,33H,34H,35H,36H,37H,38H,39HDB40H,41H,42H,43H,44H,45H,46H,47HDB48H,49H,50H
7、,51H,52H,53H,54H,55HDB56H,57H,58H,59H,60H,61H,62H,63HDB64H,65H,66H,67H,68H,69H,70H,71HDB72H,73H,74H,75H,76H,77H,78H,79HDB80H,81H,82H,83H,84H,85H,86H,87HDB88H,89H,90H,91H,92H,93H,94H,95HDB96H,97H,98H,99H;-------------------DS18B20初始化程序INIT_182
