| ??? 11/06/09 10:34 Read: times Msg Score: -1 -1 Non-Specific question |
#170490 - moving display.... |
In this code i m just moving the display towards left. e.g from 0123 it becomes 1234...and so on...now after it reaches 789...i want it to restart from 0123...where should i put the condition and how?
$mod51 alarm_output equ P1.7 key_start equ p3.0 digit1 data 08h digit2 data 09h digit3 data 10h digit4 data 11h delayreg data 15h delayreg100us data 16h delayreg1ms data 17h org 2000h mov sp,#50h mov digit1,#0 mov digit2,#1 mov digit3,#2 mov digit4,#3 start: back: call display call pip_pip call delay1ms inc digit1 inc digit2 inc digit3 inc digit4 jmp start ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ display: mov a,digit1 clr p3.2 call segdisplay setb p3.2 mov a,digit2 clr p3.3 call segdisplay setb p3.3 mov a,digit3 clr p3.4 call segdisplay setb p3.4 mov a,digit4 clr p3.5 call segdisplay setb p3.5 ret ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ segdisplay: mov dptr,#lookup movc a,@a+dptr cpl a mov p1,a call delay1ms mov p1,#0ffh ret ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ pip_pip: mov r1,#150 pp1: clr alarm_output call delay100us call delay100us call delay100us setb alarm_output call delay100us call delay100us djnz r1,pp1 mov r1,#150 bp11: call display djnz r1,bp11 mov r1,#250 pp2: clr alarm_output call delay100us call delay100us call delay100us setb alarm_output call delay100us call delay100us djnz r1,pp2 mov r1,#15 bp10a: call display djnz r1,bp10a setb alarm_output mov r1,#30 bp11a: call display djnz r1,bp11a ret ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ delay100us: mov delayreg100us,#48 ;11.05mhz djnz delayreg100us,$ ret delay1ms: mov delayreg1ms,#10 d1ms:call delay100us djnz delayreg1ms,d1ms ret delay10ms: mov r4,#10 d10ms:call delay1ms djnz r4,d10ms ret delay100ms: mov r7,#100 x4: call delay1ms djnz r7,x4 ret delay1s: mov r6,#10 x5: call delay100ms djnz r6,x5 ret delay1sec: mov r5,#100 d1s:call delay10ms djnz r5,d1s ret delaydisp: call delay1ms ret lookup: db 3fh,06h,5bh,4fh,66h,6dh,7dh,07h ;0,1,2,3,4,5,6,7,8 db 7fh,6fh,48h,43h,0c6h,61h,44h,4eh ;9,a,b,c,d,e,f end |
