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[AVR] problem in atmega8....

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Deexith Hasan

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a simple program on timer1 to get 1sec delay and successfully compiled in winavr.. but got error push program stack:SP is not initialized .. in proteus....
how to solve it.........

Code: 
#include <avr/io.h>
#include <util/delay.h> 
  void delay();
 
  void main(void)
 
  {
    SPH=0X00;
	SPL=0X00;
    DDRB=0XFF;
    while(1)
    {
	PORTB=0X00;
	delay();
	PORTB=0XFF;
	delay();
      
    }
    
  }

   void delay()
{
TCNT1H=0X85;
TCNT1L=0XEE;
TCCR1A=0X00;
TCCR1B=0X04;
  while((TIFR& (0X1<<TOV1))==0);
TCCR1B=0X00;
  TIFR=0x1<<TOV1;
  }
 

Here is mikroC PRO AVR Code.

It uses Timer to get 1 second delay. LEDs are connected to PORTB.

Code C - [expand]
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char count = 0;
 
//Timer1 Prescaler = 64; Preload = 31249; Actual Interrupt Time = 500 ms
 
//Place/Copy this part in declaration section
void InitTimer1() {
    SREG_I_bit = 1;
    TCCR1A = 0x80;
    TCCR1B = 0x0B;
    OCR1AH = 0x7A;
    OCR1AL = 0x11;
    OCIE1A_bit = 1;
}
 
void Timer1Overflow_ISR() org IVT_ADDR_TIMER1_COMPA {
    //Enter your code here
    if(++count == 2) {
         count = 0;
         PORTB = ~PORTB;
    }
}
 
void main() {
 
    DDRB = 0xFF;
    DDRC = 0xFF;
    DDRD = 0xFF;
    
    PORTB = 0x00;
    PORTC = 0x00;
    PORTD = 0x00;
    
    InitTimer1();
    
    while(1) {
    
          asm nop
    }
}



broken link removed
 

Attachments

  • Timer Based LED Blinking.rar
    72.9 KB · Views: 56
  • Timer Based LED Blinking.png
    Timer Based LED Blinking.png
    19.3 KB · Views: 96
  • Atmel Studio.rar
    36.4 KB · Views: 51
Last edited by a moderator:

thats k....for atmega16 & 32 got gud result in proteus only for atmega8 y?? what does it mean error push program stack:SP is not initialized
 

SP not initialized means Stack Pointer not initialized. Why are you clearing the stack pointer in the code. Don't do anything with stack pointer. Here I am attaching LED Blinking code made for different AVR Compilers.
 

Attachments

  • LED Blinking.rar
    354.1 KB · Views: 55

i removed the SP again faced the same problem....
Code: 
SPH=0X00;
SPL=0X00;
y????
 

Unistall Atmel Studio and install the latest version which is v6.2 and try.
 

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