Discussion in "Project Help" started by    ppoonamk    Apr 28, 2011.
Thu Apr 28 2011, 02:56 AM
#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, 08:09 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, 03:15 PM
#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, 11:12 PM
#4
Thanks for your response.. will get back to after these changes

Get Social

Information

Powered by e107 Forum System

Conversation

sahar7478
Fri Dec 08 2017, 12:47 PM
can i get gsm a6 library? can anybody help? tia
Faiqa
Sat Nov 25 2017, 08:32 AM
Can i get the code of Monitering and controlling of green house effect? ... Can anyone help me ?
Wed Nov 08 2017, 01:35 PM
Anirudh jain
I want to burn code in atmel 89s51 24pc 0329 but cannot get the connection with the burner. Can somebody provide me with the circuit diagram for connecting controller to burner. I'm using usb burner
Thu Nov 02 2017, 11:44 AM
karpal
write a program to exchange the content of b register with external RAM address 02CFH help me
Wed Nov 01 2017, 05:47 PM
sanae
i am using the DHT11 but i'm getting some errors in the simulate the programe in proteus 8 professional,: 1)cannot find model file 'DHTXX.MDF'.2)simulation failed due to netlist linker error(s).
Fri Sep 29 2017, 02:45 AM
Maaz
i am doing the same project on verilog please contact me [email protected]
Wed Sep 20 2017, 12:36 AM
Ted
In a missing pulse detector using a 555 timer connected as a monostable vibrator with a PNP transistor,how does the positve input pulse turn on the PNP transistor?
Sun Sep 03 2017, 02:29 PM
martymarty
How do I connect an <NOKIA 1100 LCD > to an atmega328P ?
poojab51296
Sun Aug 20 2017, 10:23 AM
i am intending to interface sd card with STM32F4 and want to write a file in sd card using SPI protocol but using HAL only. Can anyone help me PLEASE!!!!
poojab51296
Sun Aug 20 2017, 10:22 AM
hello

Downloads

Comments

roopay
Wed Dec 13 2017, 07:11 AM
janvimandeep
Mon Dec 11 2017, 01:05 PM
fernanmonroy2
Mon Dec 11 2017, 08:33 AM
sahar7478
Fri Dec 08 2017, 12:34 PM
zhudao
Tue Dec 05 2017, 06:14 AM
chetan6379
Sat Dec 02 2017, 03:42 PM
HaloSpartanOdst
Fri Dec 01 2017, 12:05 PM
workzone
Sat Nov 25 2017, 01:13 PM

Online

Guests: 95, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 37928
Newest member: roopay
Forum Activity
fernanmonroy2 Avatar
Posted By fernanmonroy2
Mon Dec 11 2017, 08:40 AM
Que significa que el contador de programa abordar...
zhudao Avatar
Posted By zhudao
Wed Dec 06 2017, 03:08 AM
I think either your 120 - 5 volt adapter, or the L...
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Dec 05 2017, 08:12 PM
I think either your 120 - 5 volt adapter, or the L...
zhudao Avatar
Posted By zhudao
Tue Dec 05 2017, 06:41 AM
Hi to all, in the period time I'm doing an project...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Nov 20 2017, 10:18 PM
Here is a version of the tutorial that reads a key...
Ansh12 Avatar
Posted By Ansh12
Mon Nov 20 2017, 02:15 AM
As a starting point, can you tell us how much of t...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sun Nov 19 2017, 08:35 PM
As a starting point, can you tell us how much of t...
Ansh12 Avatar
Posted By Ansh12
Fri Nov 17 2017, 04:07 AM
I am looking keypad interfacing program. I was rea...
JardCrocker Avatar
Posted By JardCrocker
Wed Nov 08 2017, 05:29 PM
Hi...i am a new user here. I was also facing the s...
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Nov 07 2017, 07:13 PM
> It employs a fairly advanced technique to detect...