PORTEUS 7 related problem...

• Aug 27, 2012

• #1

ismbn

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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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Code C - [expand]
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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++;
    }

---

View attachment serial comm.rar


Thanks Regards
ISMAIL

 

• Aug 27, 2012

• #2

alexan_e

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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?

 

• Aug 29, 2012

• #3

ismbn

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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

 

• Aug 30, 2012

• #4

I

internetuser2k12

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

 

Last edited: Aug 30, 2012

• Aug 30, 2012

• #5

alexan_e

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internetuser2k12 said:

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

Click to expand...

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

 

• Sep 7, 2012

• #6

ismbn

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@internetuser2k12

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

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

 

• Sep 7, 2012

• #7

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

 

• Sep 7, 2012

• #8

ismbn

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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

 

• Sep 7, 2012

• #9

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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?

 

• Sep 7, 2012

• #10

ismbn

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

 

• Sep 7, 2012

• #11

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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?

 

Last edited: Sep 7, 2012

• Sep 7, 2012

• #12

ismbn

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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

 

• Sep 7, 2012

• #13

M

madhusuthanan

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hi,

plz ceack the code

 

• Sep 7, 2012

• #14

ismbn

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@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

 

• Sep 8, 2012

• #15

M

madhusuthanan

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hi ismail,

then you use hardware crystal is connected & check it.

 

• Sep 8, 2012

• #16

ismbn

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@madhusuthanan
yah

 

• Sep 8, 2012

• #17

M

madhusuthanan

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hi ismail,

still you have the problem.

- - - Updated - - -

please specify the crystal that you have used in hardware

 

• Sep 8, 2012

• #18

ismbn

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its 16MHz

some KS 16.000 is written on it...

 

• Sep 8, 2012

• #19

M

madhusuthanan

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that value you written on your program.

 

• Sep 8, 2012

• #20

ismbn

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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>