PORTEUS 7 related problem...

[ismbn]

Hi all...

I am using Porteus 7 professional for circuit simulation... and using AVR studio 4.


Now the problem is I am doing coding for making baud rate of 9600 or 19200 or what ever but when i am simulation the program it's working on baud rate of only 1200: what is the problem behind this i am sending the code all the file please tell me if i am wrong any where:I am using AT MEGA 2560 in the project :

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#include<avr/io.h>
#include<avr/interrupt.h>
#include<delay.h>
#define Baud_rate 19200
#define ubrr_value (((F_CPU/(Baud_rate * 16UL))-1))
int a,c=1;
int main(void)
{
DDRB=0XFF;
DDRD=0XFF;
UBRR0H = (ubrr_value>>8);
UBRR0L = (ubrr_value);
sei ();
UCSR0B=(1<<RXCIE0) | (1<<TXCIE0)|(1<<RXEN0)|(1<<TXEN0);
UCSR0C=(3<<UCSZ00);
 
while(1)
{
//_delay_ms(10);
//UDR0='p';
//a=UDR0;
 
/*for(int i=0;i<=256;i++)
    {
    UDR0=i; 
    }*/
}
 
}
int b=1;
    ISR (USART0_RX_vect)
    {
    PORTB=c;
    c++;
    a=UDR0;;
 
    UDR0=a;
    }
 
    ISR (USART0_TX_vect)
    {
    PORTD=b;
    b++;
    }

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View attachment serial comm.rar


Thanks Regards
ISMAIL

 

[alexan_e]

You are currently using 8MHz clock in the simulation (internal RC), change the mcu properties in proteus to crystal 16MHz as in your code

- - - Updated - - -

Actually I'm not sure of the clock frequency you intend to use, is it 8MHz?

 

[ismbn]

no sir i have tried i changed it to the other clock frequency also it but it is not working at all...

please tell me what to do. Do i need to to check this in hardware only???
Ismail

 

[internetuser2k12]

What does your code do. I dont know ATMEGA, but I will try to help. where is sei() function?

 

[alexan_e]

What does your code do. I dont know ATMEGA, but I will try to help. where is sei() function?

https://www.nongnu.org/avr-libc/user-manual/group__avr__interrupts.html

 

[ismbn]

@internetuser2k12

the sei(); function is on the line No. 13
plz see

Now i am using the the hardwear hear also the sam prblem

 

[internetuser2k12]

line no 13 only calls sei() function. Where is the function prototype and where is the actual function in the code?

 

[ismbn]

oh... sorry sei() function is in the #include<avr/interrupt.h>
this function enables the global interrupt pin if u have installed win avr u can find it in C:\WinAVR\avr\include\avr\interrupt.h

ismail

 

[internetuser2k12]

OK. I have avr studio 6. I tried to compile your code, but I got error. It said delay.h missing. I cant find delay.h file on my system. Can you upload the file?

 

[ismbn]

yah just do it #include<stdio.h> and try

 

[internetuser2k12]

I tried. Nothing happens. Can you explain the code? every instruction?

Read this http://deans-avr-tutorials.googlecode.com/svn/trunk/InterruptUSART/Output/InterruptUSART.pdf

I think according to your code whenever there is Rx or Tx, c and b is assigned to port b and d and c and b are incremented.

But your code doesn't transmit anything using uart. so interrupt is not caused on Tx. How are you sending data to ATMEGA, so that interrupt occurs on Rx?

 

[ismbn]

https://www.edaboard.com/threads/265009/

go to this link i have change some codes it will help to u to understand
in this the transition and recive working well


ISMAIL

 

[madhusuthanan]

hi,

plz ceack the code

 

[ismbn]

@madhusuthanan ....
sorry i din't got u..
i have checked the code 1000 times... but faild to do it... if you can suggest me for some changes it will be great.......

Regard
Ismail

 

[madhusuthanan]

hi ismail,

then you use hardware crystal is connected & check it.

 

[ismbn]

@madhusuthanan
yah

 

[madhusuthanan]

hi ismail,

still you have the problem.

- - - Updated - - -

please specify the crystal that you have used in hardware

 

[ismbn]

its 16MHz

some KS 16.000 is written on it...

 

[madhusuthanan]

that value you written on your program.

 

[ismbn]

this is also 16MHz...
it is set in the properties of the program...
and yes you was asking for the
_delay_ms(10);

for this you have to do::

#include <util/delay.h>