Thanks for having a forum for assembly language and hello. I manufacture synchronized clock systems. The previous owner did all the firmware for our products. I do not code so I hire out my firmware/software development. I have a master clock that is not setting DST (daylight saving time) consistently. My Chipmaster 3000 computer has finally died and before I pay someone to burn a bunch of chips I would like to get my DST issues worked out. The code is written for a 87C51FB and he used the ASM51 assembler, I mentioned the burner, I'm not sure what other info a person might need. I think this is the section of firmware that sets DST. I would appreciate feedback on the code, thanks. ;DSTWT: MOV DAYS,#0 ; DST DATE SET ROUTINE ; MOV IND1,#01100000B ; BEGIN, MONTH ; MOV SCTCH1,#1 ; MOV IND2,#0 ; MOV DHRS,#0FFH ; MOV DFLAG,#00000001B ; MOV SCTCH2,#0FFH ; MOV MINS,#0FFH ; MOV SCTCH3,#0FFH ; MOV SCTCH4,#0FFH ; MOV SCTCH5,#0FFH ; CALL BTNCLR ;DSTLUP: CALL BTNCK ; JB BTN1.5,DSTLP1 ; CANCEL ; JB BTN2.0,DSET ; AHEAD ; JB BTN2.1,DSET ; BACK ; JB BTN2.3,DSTREV ; REVIEW ; JB BTN2.2,DSTNXT ; SELECT ; JMP DSTLUP ;DSTLP1: JMP FINISH ;; ;DSTNXT: CALL BMD ; JMP DSTLUP ;DSET: CALL HT1 ; MOV DPTR,#DST ; MOV A,SCTCH2 ; MOVX @DPTR,A ; INC DPTR ; MOV A,SCTCH3 ; MOVX @DPTR,A ; INC DPTR ; MOV A,SCTCH4 ; MOVX @DPTR,A ; INC DPTR ; MOV A,SCTCH5 ; MOVX @DPTR,A ; JMP DSTLUP ;DSTREV: MOV IND2,#00001000B ; REVIEW ; MOV IND1,#01110000B ; BEGIN, MONTH, DATE ; MOV DPTR,#DST ; MOVX A,@DPTR ; MOV DHRS,A ; INC DPTR ; MOVX A,@DPTR ; MOV MINS,A ;RVDST1: CALL BTNCLR ;DSRVLP: CALL BTNCK ; JB BTN1.5,DSTCNC ; CANCEL ; JB BTN2.3,DSTWT ; REVIEW ; JNB BTN2.2,DSRVLP ; SELECT ; MOV A,IND1 ; ANL A,#10000000B ; CHECK FOR END ; JNZ DSTREV ; MOV IND1,#10110000B ; END, MONTH, DATE ;; MOV IND2,#00001000B ; REVIEW ; MOV DPTR,#DST+2 ; MOVX A,@DPTR ; MOV DHRS,A ; INC DPTR ; MOVX A,@DPTR ; MOV MINS,A ; JMP RVDST1 ;DSTCNC: MOV B,4H ; MOV DPTR,#DST ;RVDST2: MOV A,#0FFH ; MOVX @DPTR,A ; INC DPTR ; MOV A,B ; DEC A ; MOV B,A ; JNZ RVDST2 ; JMP DSTREV
