Discussion in "Project Help" started by    ppoonamk    Apr 27, 2011.
Wed Apr 27 2011, 10:56 PM
#1
http://img715.imageshack.us/i/cktn.jpg/
This is the circuit diagram of the project im working on. I have a few queries.
1) My Leds connected to P0.0 and P0.1 are not glowing. Is the resistance value too high?
2) The lcd backlight glows but no characters are displayed.
3) Are the 2 reset pins required if you are not using interrupts in your program?
This is my code.. Are there any errors?


busy equ p1.7
rs equ p3.5
rw equ p3.4
en equ p3.3
bzr equ p0.2
ledf equ p0.0
ledb equ p0.1

org 400h

show0: db 'Welcome To All','0'
show1: db 'Current Station','0'
show2: db 'Next Station','0'
show3: db 'Zurich','0'
show4: db 'Milan','0'
Show5: db 'Paris','0'

org 0000h
ajmp main

org 0003h
test: mov c,p3.2
jnc halt
setb bzr
reti
halt:
clr bzr ;till zero blow on the bzr
ajmp test

main:
mov ie,#00h
setb ea
setb ex0
here:
mov p2,#00h
acall ini
mov dptr,#show0
acall read
clr ledf ;p1.0
acall delay

mov a,#01h
acall command; Now make memory clear cursor home
mov dptr,#show1
acall read
setb ex0
mov a,#0c0h
acall command
mov dptr,#show3
acall read
acall delay ;Stopage1 time 3 sec rookee
acall delay
clr bzr
acall delay

mov a,#01h
acall command
mov dptr,#show2
acall read
mov a,#0c0h
acall command
mov dptr,#show4
acall read
setb bzr
acall delay10

mov a,#01h
acall command
mov dptr,#show1
acall read
mov a,#0c0h
acall command
mov dptr,#show4
acall read
acall delay ;Stopage2 time 3 sec shsar
acall delay
clr bzr
acall delay

mov a,#01h
acall command
mov dptr,#show2 ;display ne
acall read
mov a,#0c0h
acall command
mov dptr,#show5
acall read
setb bzr


mov a,#01h
acall command
mov dptr,#show1
acall read
mov a,#0c0h
acall command
mov dptr,#show5
acall read

acall delay ;Stopage2 time 3 sec Meerut
acall delay
clr bzr
acall delay

setb ledf ; p1.0 ;off led at p1.0 for forward journey
clr ledb ; p1.1 ; 0n Led for back ward journey

mov a,#01h
acall command
mov dptr,#show2 ;display ne shar
acall read
mov a,#0c0h
acall command
mov dptr,#show4
acall read
setb bzr

mov a,#01h
acall command
mov dptr,#show1
acall read
mov a,#0c0h
acall command
mov dptr,#show4
acall read
acall delay ;Stopage2 time 3 sec shsar
acall delay
clr bzr
acall delay

mov a,#01h
acall command
mov dptr,#show2 ;display ne roor
acall read
mov a,#0c0h
acall command
mov dptr,#show3
acall read
setb bzr

mov a,#01h
acall command
mov dptr,#show1
acall read
mov a,#0c0h
acall command
mov dptr,#show3
acall read
setb ledb ;p1.1
ljmp here
;routine for stepper motor
; Delay Routine ;one sec delay
delay:
push acc
push 00h
push 01h
push p0
push p1
mov r0,#0eh
loopr:
mov a,#0ffh
loopb:
mov b,#0ffh
loopa: djnz b,loopa
djnz 0e0h,loopb
djnz r0,loopr
pop p1
pop p0
pop 01h
pop 00h
pop acc
ret


;=============== Routine to read data from prog mem

read:
nex: clr a
movc a,@a+dptr
cjne a,#'0',aga
sjmp down
aga: acall display
inc dptr
sjmp next
down:
ret ;LCD strobe subroutines

ini: mov a,#38h
acall command
mov a,#38h
acall command
mov a,#38h
acall command
mov a,#38h
acall command
mov a,#0eh
acall command
mov a,#06h
acall command
mov a,#01h
acall command
mov a,#80h
acall command
ret

command:
acall ready
mov p1,a
clr rs
clr rw
setb en
clr en
ret

display:
acall ready
mov p1,a
setb rs
clr rw
setb en
clr en
ret

ready:
clr en
mov p1,#0ffh
clr rs
setb rw
wait: clr en
setb en
jb busy,wait
clr en
Ret

End
Thu Apr 28 2011, 04:09 AM
#2
Asm Code is diffcult to understand, Go through step by step divide your code to do individual task first then try to combine all.
In LCD, do you see boxes in them, r just blank, adjust the contrast pot so that you can see the boxes and the text.
If there is boxes means LCD hasn't been initialized properly.
Thu Apr 28 2011, 11:15 AM
#3

1) My Leds connected to P0.0 and P0.1 are not glowing. Is the resistance value too high?

ppoonamk


yes resistance should be around 680 ohms.

2) The lcd backlight glows but no characters are displayed.

ppoonamk


As kiran suggested. you can follow LCD tutorial if facing problem.

3) Are the 2 reset pins required if you are not using interrupts in your program?

ppoonamk


what has interrupt to do with the reset pin? and there is only 1 reset on controller not 2. Moreover your reset circuit is wrong. Please correct it.
You need a capacitor (10uF) between VCC and RST; and a resistor (10K) between RST and GND.

This is my code.. Are there any errors?

ppoonamk


You have to assemble your code to find out errors. logical errors can only be corrected once you run the code on hardware to see how its behaving.

Do the changes in hardware as suggested and try again.
Thu Apr 28 2011, 07:12 PM
#4
Thanks for your response.. will get back to after these changes

Get Social

Information

Powered by e107 Forum System

Conversation

ajay_bhargav
Sat Aug 30 2014, 12:15 PM
@sufiyan, You can use solenoid lock in place of LED.
Fri Aug 29 2014, 12:17 AM
sufiyan
please can you tell me which type of lock activator should i connect in place of LED? can i use selenoid lock actuator
ajay_bhargav
Thu Aug 28 2014, 06:34 AM
Please post questions in forum
Thu Aug 28 2014, 01:44 AM
yednekachew
can you give a project made bay proteus software
Mon Aug 25 2014, 07:12 AM
Vinod Soni
Hi Sir, How can i make this RFID with ATMega16/32 controller
pavanjain
Sat Aug 23 2014, 05:10 AM
Sir i want to download the hex file in P89v51rd2 microcontroller using max232 IC but we not load the program in IC
Tue Aug 19 2014, 04:51 PM
allen ndumu
please i will like to know if the problem of speed control of dc motor using keypad and l298 was if yes can i have the complete project send it to the address i really need to see it
Tue Aug 19 2014, 10:47 AM
Amit Bisht
sir i want to have some trending projects on which i could work related to ATmega 16 microcontroller
ExperimenterUK
Sat Aug 16 2014, 04:16 PM
@diligent . create a thread
Sat Aug 16 2014, 03:17 PM
diligent
in assembly langauage programming..

Downloads

Comments

bobparihar
Mon Sep 01 2014, 06:19 AM
vijit
Sun Aug 31 2014, 08:33 AM
[email protected]
Sat Aug 30 2014, 04:45 PM
enisi
Wed Aug 27 2014, 06:08 AM
sadalakshmi
Wed Aug 27 2014, 12:39 AM
Paecake
Sun Aug 24 2014, 04:07 PM
pavanjain
Sat Aug 23 2014, 02:33 AM
samchovatiya
Thu Aug 21 2014, 02:30 PM

Online

Guests: 56, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 01:37 AM

Members: 37504
Newest member: bobparihar
Forum Activity
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Sep 02 2014, 03:32 PM
does it is TTL compatible? I checked the data shee...
Peter_Parker Avatar
Posted By Peter_Parker
Tue Sep 02 2014, 11:20 AM
What is your graph displaying ?I'm assuming it is ...
bobparihar Avatar
Posted By bobparihar
Tue Sep 02 2014, 01:59 AM
iam using EM-18 reader module.. but i want only to...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Sep 01 2014, 10:59 PM
What is your graph displaying ?I'm assuming it is ...
Peter_Parker Avatar
Posted By Peter_Parker
Mon Sep 01 2014, 06:19 PM
Just to add to this,I've connected this now to a C...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Sep 01 2014, 07:28 AM
Which RFID module are you using? Post link to the ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Sep 01 2014, 07:28 AM
We prefer to use English language on our forums. B...
bobparihar Avatar
Posted By bobparihar
Mon Sep 01 2014, 06:33 AM
i am using a RFID module, i want to connect reader...