/*********************************************
This program was produced by the
CodeWizardAVR V1.23.3 Standard
Automatic Program Generator
© Copyright 1998-2002 HP InfoTech s.r.l.
http://www.hpinfotech.ro
e-mail:office@hpinfotech.ro , hpinfotech@xmail.ro

Project : generate sound [Middle 'Do' (523Hz)] in PORTB.0
Version : 1
Date    : 5/30/2002
Author  : Thomas  Lui
Company : Thomtronics Technology Company
Comments:       
Connection:
 
     PORTB.0 -----|
                SPEAKER     
       GND   -----| 
     


Chip type           : ATmega128
Program type        : Application
Clock frequency     : 16.000000 MHz
Memory model        : Small
Internal SRAM size  : 4096
External SRAM size  : 0
Data Stack size     : 1024
*********************************************/

#include <mega128.h>      
unsigned char STATE;

// Timer 1 overflow interrupt service routine
interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{   
// Place your code here     
TCCR1B=0x00;
TCNT1H=255;
TCNT1L=18;     

if(STATE==1)
{
STATE=0;
PORTB.0=0;
}
else
{
STATE=1; 
PORTB.0=1;
} 

}       

void init_state(void)
{ 
 DDRB=0x00;      //output portb.0
 PORTB.0=1;   
 STATE=1; 
}

// Declare your global variables here


void main(void)
{
// Declare your local variables here
init_state();

// Input/Output Ports initialization
// Port A initialization
// Func0=In Func1=In Func2=In Func3=In Func4=In Func5=In Func6=In Func7=In 
// State0=T State1=T State2=T State3=T State4=T State5=T State6=T State7=T 
PORTA=0x00;
DDRA=0x00;

// Port B initialization
// Func0=In Func1=In Func2=In Func3=In Func4=In Func5=Out Func6=In Func7=In 
// State0=T State1=T State2=T State3=T State4=T State5=0 State6=T State7=T 
PORTB=0x00;
DDRB=0x20;

// Port C initialization
// Func0=In Func1=In Func2=In Func3=In Func4=In Func5=In Func6=In Func7=In 
// State0=T State1=T State2=T State3=T State4=T State5=T State6=T State7=T 
PORTC=0x00;
DDRC=0x00;

// Port D initialization
// Func0=In Func1=In Func2=In Func3=In Func4=In Func5=In Func6=In Func7=In 
// State0=T State1=T State2=T State3=T State4=T State5=T State6=T State7=T 
PORTD=0x00;
DDRD=0x00;

// Port E initialization
// Func0=In Func1=In Func2=In Func3=In Func4=In Func5=In Func6=In Func7=In 
// State0=T State1=T State2=T State3=T State4=T State5=T State6=T State7=T 
PORTE=0x00;
DDRE=0x00;

// Port F initialization
// Func0=In Func1=In Func2=In Func3=In Func4=In Func5=In Func6=In Func7=In 
// State0=T State1=T State2=T State3=T State4=T State5=T State6=T State7=T 
PORTF=0x00;
DDRF=0x00;

// Port G initialization
// Func0=In Func1=In Func2=In Func3=In Func4=In 
// State0=T State1=T State2=T State3=T State4=T 
PORTG=0x00;
DDRG=0x00;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
ASSR=0x00;
TCNT0=0x00;
OCR0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 2000.000 kHz
// Mode: Normal top=FFFFh
// OC1A output: Toggle
// OC1B output: Discon.
// OC1C output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
TCCR1A=0x00; 
TCCR1B=0x00; 
TCNT1H=255;
TCNT1L=18; 
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
OCR1CH=0x00;
OCR1CL=0x00;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
TCCR2=0x00;
ASSR=0x00;
TCNT2=0x00;
OCR2=0x00;

// Timer/Counter 3 initialization
// Clock source: System Clock
// Clock value: Timer 3 Stopped
// Mode: Normal top=FFFFh
// OC3A output: Discon.
// OC3B output: Discon.
// OC3C output: Discon.
TCCR3A=0x00;
TCCR3B=0x00;
TCNT3H=0x00;
TCNT3L=0x00;
OCR3AH=0x00;
OCR3AL=0x00;
OCR3BH=0x00;
OCR3BL=0x00;
OCR3CH=0x00;
OCR3CL=0x00;

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
// INT3: Off
// INT4: Off
// INT5: Off
// INT6: Off
// INT7: Off
EICRA=0x00;
EICRB=0x00;
EIMSK=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x04;
ETIMSK=0x00;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
// Analog Comparator Output: Off
ACSR=0x80;
SFIOR=0x00;

// Global enable interrupts
#asm("sei")
 

// Place your code here           

while(1)
    {      
     TCCR1B=0x03;    
    }   
}