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

ExperimenterUK
Tue Jul 19 2016, 05:59 PM
@mhammad 64 bits is 8 bytes.
Tue Jul 19 2016, 07:56 AM
mhammad kassem
hello! i want to know how to use UART in mikroc , I want to receive 64 bits from another microcontroller and i dont know how to start my code to receive the 64 bits...any help?
ExperimenterUK
Mon Jul 18 2016, 08:32 PM
@meena.. are you still having trouble ?
Sat Jul 16 2016, 10:19 AM
Meena
problem in loading email address while registering.Please help
Sun Jul 10 2016, 02:50 PM
shockwave
could you please provide a sample code that controling LED using bluetooth HC-05 interfacing pic16f877a thank you!
Sun Jul 10 2016, 02:49 PM
shockwave
Help!
ExperimenterUK
Sat Jul 09 2016, 05:25 PM
@Santhana krishnan post in forum to discuss your problem
Thu Jul 07 2016, 09:26 AM
Santhana krishnan
Hi i program atmega 32 it was functiining corectly but now aref pins voltage 2.56 is droped to .85 volts also a ports input viltage also dropped so anologe inpit not funcitonig please help me to find out the problem
Thu Jul 07 2016, 09:24 AM
Santhana krishnan
Hi i program the atmega 32
Thu Jul 07 2016, 09:24 AM
Santhana krishnan
Hi

Downloads

Comments

adithyapaip
Thu Jul 21 2016, 05:45 PM
celu
Thu Jul 21 2016, 05:27 PM
Aiko
Wed Jul 20 2016, 01:51 PM
JorgeG
Sat Jul 16 2016, 07:19 PM
Piotrekk
Wed Jul 06 2016, 09:35 AM
dyoussef
Wed Jun 29 2016, 07:29 PM
sung7333
Tue Jun 28 2016, 06:23 AM
Bonolai
Fri Jun 24 2016, 06:02 AM

Online

Guests: 24, Members: 0 ...

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

Members: 37775
Newest member: adithyapaip
Forum Activity
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Jul 23 2016, 07:14 PM
I found this datasheet, it is a type of driver.It ...
Piotrekk Avatar
Posted By Piotrekk
Fri Jul 22 2016, 10:12 AM
I found an old box of electronic components in the...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Jul 21 2016, 07:37 PM
That is curious, but very likely a co-incidence.Th...
adithyapaip Avatar
Posted By adithyapaip
Thu Jul 21 2016, 07:18 PM
I am using keil to do everthing in 8051,when I was...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Jul 21 2016, 07:14 PM
By far the easiest and cheapest way to talk to the...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Jul 21 2016, 07:04 PM
The crystal on the programmer does not affect the ...
adithyapaip Avatar
Posted By adithyapaip
Thu Jul 21 2016, 06:06 PM
Hi Guys..i have a 8051 programmer which has 4mhz c...
Aiko Avatar
Posted By Aiko
Wed Jul 20 2016, 01:56 PM
ankitbajaj01 Avatar
Posted By ankitbajaj01
Wed Jul 20 2016, 04:49 AM
Dear All,Greetings!!!I want to develop Online moni...
sairfan1 Avatar
Posted By sairfan1
Tue Jul 19 2016, 09:56 PM
Now a days there are many smart locks available li...