Assembler Developer Forum RSS Feed (Replies Included)

Monitoring EAX register under OllyDbg

Mon, 13 May 2013 00:12:10 -0700

how can I monitor for example the EAX register under OllyDbg?

For example: Program "Notepad" is currently runníng. If I set a condition: If EAX == A5 Then If EAX == A5 Then Pause Program "Notepad".

How can be this realized?

Monitoring EAX register under OllyDbg

Mon, 13 May 2013 00:09:42 -0700

You say good

Thu, 09 May 2013 23:29:25 -0700

You say good, I very much agree with your point of view, refuel ah! We should strive.
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Re: need help with writing asm code for 8051 project

Fri, 12 Apr 2013 19:59:24 -0700

For my suggestion is that try Edsim. it the interpreter for 8051 . it will read your hex file after generating your assembly code. have you try compiling your assembly code?

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Multiple lookup tables

Wed, 27 Feb 2013 03:34:29 -0700

Hello. I need to use several lookup tables(DATA,DATA1...) in one program and it should change after some time (like after 1s). Is it possible to do it in assembler language with 8051 microcontroler? Thank you in advance.

MAIN:
MOV DPTR,#DATA
CLR A
MOVC A,@A+DPTR
MOV R2,A      
INC DPTR
......
DATA: 
DB 36D 
DB 1D,254D       
;DB 22D,233D
...

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help finishing temperature sensor using asm code, please and thank you

Mon, 25 Feb 2013 15:18:13 -0700

hi wondering if anyone can help me out with this, ive got the lcd displaying information, but i want it to display the temperature using the lm35 and adc0804 as well, using asm code. Basically i need to get the current reading from the lm35 and convert them in the adc0804 and then display that reading in degrees on the lcd display. I have found some similar projects like this but they were written in C. any help needed, thanks in advance

current embedded image
http://www.flickr.com/photos/6024224...in/photostream

current code:

$mod51
rw equ P3.1
rs equ P3.0
en equ P3.2

org 0000h

clr rw
acall lcd_init
main:
mov a, #'W'
acall lcd_data
mov a,#'e'
acall lcd_data
mov a, #'l'
acall lcd_data
mov a,#'c'
acall lcd_data
mov a, #'o'
acall lcd_data
mov a,#'m'
acall lcd_data
mov a, #'e'
acall lcd_data
mov a,#' '
acall lcd_data
mov a,#'K'
acall lcd_data
mov a,#'e'
acall lcd_data
mov a,#'i'
acall lcd_data
mov a,#'t'
acall lcd_data
mov a,#'h'
acall lcd_data
sjmp $


lcd_init:
mov a,#01h
acall lcd_cmd
mov a,#38h
acall lcd_cmd
mov a,#0ch
acall lcd_cmd
mov a,#06h
acall lcd_cmd
ret


lcd_cmd:
clr rs
mov p2,a
setb en
acall delay
clr en
ret

lcd_data:
setb rs
mov p2,a
setb en
acall delay
clr en
ret

delay:
mov r0,#5h
l2: mov r1,#0ffh
l1: djnz r1,l1
    djnz r0,l2
ret



end

help finishing temperature sensor using asm code, please and thank you

Mon, 25 Feb 2013 15:16:22 -0700

$mod51
rw equ P3.1
rs equ P3.0
en equ P3.2

org 0000h

clr rw
acall lcd_init
main:
mov a, #'W'
acall lcd_data
mov a,#'e'
acall lcd_data
mov a, #'l'
acall lcd_data
mov a,#'c'
acall lcd_data
mov a, #'o'
acall lcd_data
mov a,#'m'
acall lcd_data
mov a, #'e'
acall lcd_data
mov a,#' '
acall lcd_data
mov a,#'K'
acall lcd_data
mov a,#'e'
acall lcd_data
mov a,#'i'
acall lcd_data
mov a,#'t'
acall lcd_data
mov a,#'h'
acall lcd_data
sjmp $


lcd_init:
mov a,#01h
acall lcd_cmd
mov a,#38h
acall lcd_cmd
mov a,#0ch
acall lcd_cmd
mov a,#06h
acall lcd_cmd
ret


lcd_cmd:
clr rs
mov p2,a
setb en
acall delay
clr en
ret

lcd_data:
setb rs
mov p2,a
setb en
acall delay
clr en
ret

delay:
mov r0,#5h
l2: mov r1,#0ffh
l1: djnz r1,l1
    djnz r0,l2
ret



end

need help with writing asm code for 8051 project

Mon, 25 Feb 2013 15:07:29 -0700

hi wondering if anyone can help me out with this, ive got the lcd displaying information, but i want it to display the temperature using the lm35 and adc0804 as well, using asm code. Basically i need to get the current reading from the lm35 and convert them in the adc0804 and then display that reading in degrees on the lcd display. I have found some similar projects like this but they were written in C. any help needed, thanks in advance

current embedded image
[url]http://www.flickr.com/photos/60242244@N02/8508718148/in/photostream[ /url]

current code:

$mod51
rw equ P3.1
rs equ P3.0
en equ P3.2

org 0000h

clr rw
acall lcd_init
main:
mov a, #'W'
acall lcd_data
mov a,#'e'
acall lcd_data
mov a, #'l'
acall lcd_data
mov a,#'c'
acall lcd_data
mov a, #'o'
acall lcd_data
mov a,#'m'
acall lcd_data
mov a, #'e'
acall lcd_data
mov a,#' '
acall lcd_data
mov a,#'K'
acall lcd_data
mov a,#'e'
acall lcd_data
mov a,#'i'
acall lcd_data
mov a,#'t'
acall lcd_data
mov a,#'h'
acall lcd_data
sjmp $


lcd_init:
mov a,#01h
acall lcd_cmd
mov a,#38h
acall lcd_cmd
mov a,#0ch
acall lcd_cmd
mov a,#06h
acall lcd_cmd
ret


lcd_cmd:
clr rs
mov p2,a
setb en
acall delay
clr en
ret

lcd_data:
setb rs
mov p2,a
setb en
acall delay
clr en
ret

delay:
mov r0,#5h
l2: mov r1,#0ffh
l1: djnz r1,l1
    djnz r0,l2
ret



end

need help with writing asm code for 8051 project

Mon, 25 Feb 2013 15:05:05 -0700

hi wondering if anyone can help me out with this, ive got the lcd displaying information, but i want it to display the temperature using the lm35 and adc0804 as well, using asm code. Basically i need to get the current reading from the lm35 and convert them in the adc0804 and then display that reading in degrees on the lcd display. I have found some similar projects like this but they were written in C. any help needed, thanks in advance

current embedded image
[url]http://www.flickr.com/photos/60242244@N02/8508718148/in/photostream[ /url]

current code:

$mod51
rw equ P3.1
rs equ P3.0
en equ P3.2

org 0000h

clr rw
acall lcd_init
main:
mov a, #'W'
acall lcd_data
mov a,#'e'
acall lcd_data
mov a, #'l'
acall lcd_data
mov a,#'c'
acall lcd_data
mov a, #'o'
acall lcd_data
mov a,#'m'
acall lcd_data
mov a, #'e'
acall lcd_data
mov a,#' '
acall lcd_data
mov a,#'K'
acall lcd_data
mov a,#'e'
acall lcd_data
mov a,#'i'
acall lcd_data
mov a,#'t'
acall lcd_data
mov a,#'h'
acall lcd_data
sjmp $


lcd_init:
mov a,#01h
acall lcd_cmd
mov a,#38h
acall lcd_cmd
mov a,#0ch
acall lcd_cmd
mov a,#06h
acall lcd_cmd
ret


lcd_cmd:
clr rs
mov p2,a
setb en
acall delay
clr en
ret

lcd_data:
setb rs
mov p2,a
setb en
acall delay
clr en
ret

delay:
mov r0,#5h
l2: mov r1,#0ffh
l1: djnz r1,l1
    djnz r0,l2
ret



end

Can someone covert this 'C' code to 'ASM' code ?

Mon, 25 Feb 2013 04:58:12 -0700

The code is for use as a temperature control system where the temperature is displayed on a lcd display using a lm35 and an 8051 chip. Any help on this would be greatly appreciated, thanks in advance.

#include<reg51.h>
#define ldata P2
#define temp P1
sbit r= P3^3;  // Write pin. It is used to start the conversion. 
sbit d= P3^4;  // Read pin. It is used to extract the data from internal register to the output pins of ADC.
sbit rs = P3^0;  //register select pin
sbit rw = P3^1;  // read write pin
sbit en = P3^2;  //enable pin
void lcdcmd (unsigned char value);
void lcddata (unsigned char value);
void lcddata1 (unsigned char value);
void delay(unsigned int msec )  // The delay function provides delay in msec.
{
int i,j ;
for(i=0;i<msec;i++)
  for(j=0; j<1275; j++);
}

void main()
{  
signed int a,b,c;     
while(1)
{
d=1;     
r=0;     
delay(1);
r=1;
delay(1);
d=0;
delay(1);
lcdcmd (0x38);
delay (1);
lcdcmd (0x0C);
delay (1);
lcdcmd (0x80);
delay (1);
lcddata ('T');
delay (1);
lcddata ('E');
delay (1);
lcddata ('M');
delay (1);
lcddata ('P');
delay (1);
lcddata (':');
delay (1);
lcddata ('-');
delay (1);
c=temp/100;
lcddata1(c);
delay (1);
a=(temp/10)-(c*10);
lcddata1(a);
delay (1);
b=temp%10;
lcddata1(b);
delay (1);
}
}
void lcdcmd (unsigned char value)
{
ldata =value;
rs=0;
rw=0;
en=1;
delay (1);
en=0;
return;
}
void lcddata1 (unsigned char value)
{
value=value+0x30;
ldata =value;
rs=1;
rw=0;
en=1;
delay (1);
en=0;
return;
}
void lcddata (unsigned char value)
{
ldata =value;
rs=1;
rw=0;
en=1;
delay (1);
en=0;
return;
}

Can someone covert this 'C' code to 'ASM' code ?

Mon, 25 Feb 2013 04:50:22 -0700

#include<reg51.h>
#define ldata P2
#define temp P1
sbit r= P3^3;  // Write pin. It is used to start the conversion. 
sbit d= P3^4;  // Read pin. It is used to extract the data from internal register to the output pins of ADC.
sbit rs = P3^0;  //register select pin
sbit rw = P3^1;  // read write pin
sbit en = P3^2;  //enable pin
void lcdcmd (unsigned char value);
void lcddata (unsigned char value);
void lcddata1 (unsigned char value);
void delay(unsigned int msec )  // The delay function provides delay in msec.
{
int i,j ;
for(i=0;i<msec;i++)
  for(j=0; j<1275; j++);
}

void main()
{  
signed int a,b,c;     
while(1)
{
d=1;     
r=0;     
delay(1);
r=1;
delay(1);
d=0;
delay(1);
lcdcmd (0x38);
delay (1);
lcdcmd (0x0C);
delay (1);
lcdcmd (0x80);
delay (1);
lcddata ('T');
delay (1);
lcddata ('E');
delay (1);
lcddata ('M');
delay (1);
lcddata ('P');
delay (1);
lcddata (':');
delay (1);
lcddata ('-');
delay (1);
c=temp/100;
lcddata1(c);
delay (1);
a=(temp/10)-(c*10);
lcddata1(a);
delay (1);
b=temp%10;
lcddata1(b);
delay (1);
}
}
void lcdcmd (unsigned char value)
{
ldata =value;
rs=0;
rw=0;
en=1;
delay (1);
en=0;
return;
}
void lcddata1 (unsigned char value)
{
value=value+0x30;
ldata =value;
rs=1;
rw=0;
en=1;
delay (1);
en=0;
return;
}
void lcddata (unsigned char value)
{
ldata =value;
rs=1;
rw=0;
en=1;
delay (1);
en=0;
return;
}

Re: Assembly language: invalid combination of opcode and operands!!!?

Sat, 23 Feb 2013 09:04:58 -0700

examine the following lines;

sys_read:
; input(s):
; eax: 3
; ebx: deviceid (unsigned int)
; ecx: output buffer (char*)
; edx: buffer length (size_t)

mov eax, 3
mov ebx, STDIN
lea ecx, output_buffer
mov edx, output_length
int 80h

ret

sys_write:
; input(s):
; eax: 4
; ebx: device id (unsigned int)
; ecx: input buffer (const char *)
; edx: input length (size_t)

mov eax, 4
mov ebx, STDOUT
lea ecx, input_buffer
mov edx, input_length
int 80h

ret

.
.
.

Re: Assembly language: invalid combination of opcode and operands!!!?

Sat, 23 Feb 2013 08:56:28 -0700

Assembly language: invalid combination of opcode and operands!!!?

Sat, 16 Feb 2013 16:39:30 -0700

Assembly language: invalid combination of opcode and operands!!!?
I'm pretty new in assembly language, writing partial code of mine
I'm keep getting the error message saying toupper.asm:108: error: invalid combination of opcode and operands
here are the lines i keep getting error messages on add t4, al
cmp t4, 11
add sum4,t4
cmp sum4,11
sub t4,11
sub sum4,11

and here is my code partially

start: ;address for gdb

;prompt user for input
;
mov eax, SYSCALL_WRITE ; write function
mov ebx, STDOUT ; Arg1: file descriptor
mov ecx, msg1 ; Arg2: addr of message
mov edx, len1 ; Arg3: length of message
int 080h ; ask kernel to write

; read user input
;
mov eax, SYSCALL_READ ; read function
mov ebx, STDIN ; Arg 1: file descriptor
mov esi, buf ; Arg 2: address of buffer
mov edx, BUFLEN ; Arg 3: buffer length
int 080h

; error check
;
mov [rlen], eax ; save length of string read
cmp eax, 0 ; check if any chars read
jg read_OK ; >0 chars read = OK
mov eax, SYSCALL_WRITE ; ow print error mesg
mov ebx, STDOUT
mov esi, msg4
mov edx, len4
int 080h
jmp exit ; skip over rest
read_OK:

L1_init:

mov ch, 10 ;initialize count
mov esi, buf ;point to start of buffer
sum4 db 0
t4 db 0
; mov ah, sum4 ;initialize sum
; mov bh, t4 ;initialize t4

L1_top:
; mov al, [cl]
mov al, [esi]
add t4, al
inc cl
cmp t4, 11
ja L1_part1

L1_cont:
add sum4,t4
cmp sum4,11
ja L1_part2

L1_part1:
sub t4,11
jmp L1_cont
L1_part2:
sub sum4,11
jmp L1_cont2
L1_cont2:
dec ch
jnz L1_top
L1_end:

Assembly language: invalid combination of opcode and operands!!!?

Sat, 16 Feb 2013 16:32:16 -0700