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
Forum Activity
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Jul 22 2014, 04:24 PM
Can the Pickit3 read the Pics signature bytes and ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Jul 22 2014, 04:16 PM
Does the DS1307 keep time ?That is, if you set it ...
pravin_35 Avatar
Posted By pravin_35
Tue Jul 22 2014, 01:05 PM
hi... i have done with a simple blinky program wi...
pravin_35 Avatar
Posted By pravin_35
Tue Jul 22 2014, 07:23 AM
Autoscale does not know what settings you keep on ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Tue Jul 22 2014, 02:19 AM
[Topic moved to PIC Microcontroller Discussion For...
ajay_bhargav Avatar
Posted By ajay_bhargav
Tue Jul 22 2014, 02:18 AM
[Topic moved to electronics discussion forum]
ajay_bhargav Avatar
Posted By ajay_bhargav
Tue Jul 22 2014, 02:17 AM
This type of problem comes in gcc based softwares....
ajay_bhargav Avatar
Posted By ajay_bhargav
Tue Jul 22 2014, 01:54 AM
are you sure your read is working properly? I mean...
ajay_bhargav Avatar
Posted By ajay_bhargav
Tue Jul 22 2014, 01:46 AM
Autoscale does not know what settings you keep on ...
pravin_35 Avatar
Posted By pravin_35
Tue Jul 22 2014, 01:06 AM
hi guys, please kindly suggest me a good PV charge...

Conversation

ajay_bhargav
Tue Jul 22 2014, 09:18 AM
@Pragya Android application is taken from google play. Only Author has its source with him. Application is only used in this project.
Tue Jul 22 2014, 04:58 AM
Pragya
plz send me 8051 code and android code for android based device controller via Bluetooth .Here in this project I am using Hc-06 Bluetooth module
Thu Jul 10 2014, 09:57 AM
Caleb
plz someone mail me the source code for that project
Thu Jul 10 2014, 09:57 AM
Caleb
http://www.8051projects.net/download-d188-control-your-pc-tv-remote.html
ExperimenterUK
Tue Jul 08 2014, 03:25 PM
Post questions in the forum.. this area is for chat
Tue Jul 08 2014, 08:15 AM
P.Panchanyam
Sir i want some new ideas for my final year projects ,which would help for our soceity in future
Tue Jul 08 2014, 01:39 AM
jasvinder
Dear Sir Ref. to the discussion held with under sign, the detail is as under--- We are in weighing scale field since 1986. We are assembling the scales by purchasing the material from out source ( From India and other countries). Now we decide to make our own Card in our decided shape. So we want to develop a universal card , which we can make all types of scales of up 100000 counts with 7 segment LED Display . Also with other features like Printing, Counting, RS232 Etc. And Three Pass words at different levels. And we can edit the Softwear. What else you can provide in this field, also mention. We will pay you the development , softwear and testing charges. And up-gradation charges at time to time. Our web site is modern-scales.com Kindly revert.
Mon Jul 07 2014, 09:20 AM
tadashige matuda
Please tell me about pic instruction ADDWF fileName,f ; fileName=fileName+W. Why twice memory access (1)fileName+W,(2)fileName=fileName+W, be able in one instruction cycle. For MOVWF fileName ; memory access once in an one instruction cycle.
Mon Jul 07 2014, 09:08 AM
tadashige matuda
pic instruction
vshal
Thu Jul 03 2014, 11:09 AM
Can somebody tell me, RLP434A 418MHz RF receiver module , this module Where get in pune ?

Downloads

Comments

vinosentinal
Mon Jul 21 2014, 08:28 PM
niks_here
Sun Jul 20 2014, 05:38 PM
athiramsankar
Sun Jul 20 2014, 12:00 PM
salemalqahtani
Sun Jul 20 2014, 12:55 AM
nagarajan.electro
Sat Jul 19 2014, 12:49 AM
praru
Sat Jul 12 2014, 07:51 AM
nmcleod1993
Thu Jul 10 2014, 09:02 AM
abdulmannan39
Thu Jul 10 2014, 05:50 AM

Online

Guests: 34, Members: 0 ...

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

Members: 37479
Newest member: vinosentinal