lcd and keypad for 8051

keypad Ùˆ 74c922

hello i want to write an assembly code for 8051 that do 4 main functions (+,-,*,/)
now i can't read from keypad (4*4) and show on lcd !!

does anyone have the assembly code for calculator?

plz help me

( sorry if my English is not good!! )

برنامه ال سی دی 8051

Use the 74c922 keyboard decoder chip (with interupt line)

lcd dptr 80c51

**broken link removed**

cjne a,#07h

www.rickeyworld.com

keypad to 74c922

I have c code for keypad and LCD

74c922

MOV P1,#0FH
LP:
MOV P1,#0FH
KPD:
MOV A,P1
CJNE A,#0FH,DIS
ACALL DELAY
JMP KRL
DIS:ACALL DELAY
SJMP KPD
KRL:MOV A,P1
CJNE A,#0FH,NEXT
ACALL DELAY
SJMP KRL
NEXT:ACALL SCANKEY
ACALL DELAY
SJMP LP
SCANKEY:
ACALL DELAY
MOV P1,#0EFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C1
MOV P1,#0DFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C2
MOV P1,#0BFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C3
MOV P1,#7FH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C4
POP 7BH
MOV P1,#0FH
LJMP LP
C1:MOV DPTR,#TABLE1
SJMP FINDROW
C2:MOV DPTR,#TABLE2
SJMP FINDROW
C3:MOV DPTR,#TABLE3
SJMP FINDROW
C4:MOV DPTR,#TABLE4
FINDROW:CJNE A,#0EH,N1
MOV A,#0
SJMP FIND
N1:CJNE A,#0DH,N2
MOV A,#1
SJMP FIND
N2:CJNE A,#0BH,N3
MOV A,#2
SJMP FIND
N3:CJNE A,#07H,HERE
MOV A,#3
FIND:MOVC A,@A+DPTR
RET
TABLE1B 0F9H,99H,0F8H,8EH
TABLE2B 0A4H,92H,80H,0C0H
TABLE3B 0B0H,82H,90H,86H
TABLE4B 088H,83H,0C6H,0A1H
کافیه که یک برنامه برای تاخیر بنویسی
ضمنا کیبورد به پورت یک وصل میشه بدون واسطه این برنامه آزمایش شده و مطمئن باش که جواب میده
اگه مشکلی بود حتما بگو
باید بگم که سایت های فارسی خیلی غنی تر اند
:|[/url]

8051+lcd+keypad+assembly codes

javad66 said:

MOV P1,#0FH
LP:
MOV P1,#0FH
KPD:
MOV A,P1
CJNE A,#0FH,DIS
ACALL DELAY
JMP KRL
DIS:ACALL DELAY
SJMP KPD
KRL:MOV A,P1
CJNE A,#0FH,NEXT
ACALL DELAY
SJMP KRL
NEXT:ACALL SCANKEY
ACALL DELAY
SJMP LP
SCANKEY:
ACALL DELAY
MOV P1,#0EFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C1
MOV P1,#0DFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C2
MOV P1,#0BFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C3
MOV P1,#7FH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C4
POP 7BH
MOV P1,#0FH
LJMP LP
C1:MOV DPTR,#TABLE1
SJMP FINDROW
C2:MOV DPTR,#TABLE2
SJMP FINDROW
C3:MOV DPTR,#TABLE3
SJMP FINDROW
C4:MOV DPTR,#TABLE4
FINDROW:CJNE A,#0EH,N1
MOV A,#0
SJMP FIND
N1:CJNE A,#0DH,N2
MOV A,#1
SJMP FIND
N2:CJNE A,#0BH,N3
MOV A,#2
SJMP FIND
N3:CJNE A,#07H,HERE
MOV A,#3
FIND:MOVC A,@A+DPTR
RET
TABLE1B 0F9H,99H,0F8H,8EH
TABLE2B 0A4H,92H,80H,0C0H
TABLE3B 0B0H,82H,90H,86H
TABLE4B 088H,83H,0C6H,0A1H
کافیه که یک برنامه برای تاخیر بنویسی
ضمنا کیبورد به پورت یک وصل میشه بدون واسطه این برنامه آزمایش شده و مطمئن باش که جواب میده
اگه مشکلی بود حتما بگو
باید بگم که سایت های فارسی خیلی غنی تر اند
:|[/url]

Click to expand...

There is NOTHING worse than sloppy, uncommented code! Not even ONE comment. THE ONLY WAY someone can use this code is if they already know how to control an LCD display and interface a keypad in which case they don't need the code!!

cjne 8051

I already wrote this code and use it to interface 4*4kepad to 8051.
with this code we can read a 4*4keypad and use for eny porpose. it just need to write a subroutin for "delay" that satisfy 10ms delay.
evryone can use this code with confident that it work well.
excusme aboat bad english.
MOV P1,#0FH
LP:
MOV P1,#0FH
KPD:
MOV A,P1
CJNE A,#0FH,DIS
ACALL DELAY
JMP KRL
DIS:ACALL DELAY
SJMP KPD
KRL:MOV A,P1
CJNE A,#0FH,NEXT
ACALL DELAY
SJMP KRL
NEXT:ACALL SCANKEY
ACALL DELAY
SJMP LP
SCANKEY:
ACALL DELAY
MOV P1,#0EFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C1
MOV P1,#0DFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C2
MOV P1,#0BFH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C3
MOV P1,#7FH
MOV A,P1
ANL A,#0FH
CJNE A,#0FH,C4
POP 7BH
MOV P1,#0FH
LJMP LP
C1:MOV DPTR,#TABLE1
SJMP FINDROW
C2:MOV DPTR,#TABLE2
SJMP FINDROW
C3:MOV DPTR,#TABLE3
SJMP FINDROW
C4:MOV DPTR,#TABLE4
FINDROW:CJNE A,#0EH,N1
MOV A,#0
SJMP FIND
N1:CJNE A,#0DH,N2
MOV A,#1
SJMP FIND
N2:CJNE A,#0BH,N3
MOV A,#2
SJMP FIND
N3:CJNE A,#07H,HERE
MOV A,#3
FIND:MOVC A,@A+DPTR
RET
TABLE1B 0F9H,99H,0F8H,8EH
TABLE2B 0A4H,92H,80H,0C0H
TABLE3B 0B0H,82H,90H,86H
TABLE4B 088H,83H,0C6H,0A1H

Re: keypad to 74c922

rohailmalhi said:

I have c code for keypad and LCD

Click to expand...

Hi,
If you don't mind. please upload the same. it'll be helpful for me

Hi arjungopinath

If you have book
"THE 8051 MICROCONTROLLER ARCHITECTURE, PROGRAMMING, & APPLICATIONS"
Second Edition

By, Kenneth J. Ayala

Then open Chapter 10.

It give LCD and Keypad assembly code with description.
Read it.

Hope this is help you.
regard.
Shyam

Let me go through the book... tanks for the guidance.