AVR Freaks

/*****************************************************
This program was produced by the
CodeWizardAVR V2.03.9 Evaluation
Automatic Program Generator
© Copyright 1998-2008 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project : 
Version : 
Date    : 4/6/2009
Author  : Freeware, for evaluation and non-commercial use only
Company : 
Comments:  program to read and write internal eeprom memory.


Chip type               : ATmega32
Program type            : Application
AVR Core Clock frequency: 4.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 512
*****************************************************/

#include 

// Standard Input/Output functions
#include 
#include 
// Declare your global variables here

eeprom char str[3] = {48,49,50};
eeprom int a=48;
int b=50;

int write_eeprom_byte(char address, char data)
{
//    EEARH=0x00;
//    EEARL = address ;
   
    while(EECR & 0x02 == 1) ;           // CHECK EEWE BIT
    
    while( SPMCR & 0x01 == 1);          // CHECK SPMEN BIT
   
    EEARH=0x00;                       // SET ADDRESS MSB BYTE
    EEARL = address ;                 // SET LSB BYTE OF ADDRESS
    EEDR = data ;                     // WRITE data to be written to EEPROM    
    EECR = 0x04 ;                       // SET EEMWE BIT
    #asm
        nop;
        nop;
       
    #endasm
    EECR = 0x06;                        // SET EEMWE & EEWE BITS
    
    while(EECR & 0x04 == 1);           // CHECK EEMWE IS CLRED
    
    
  //  delay_ms(10);                      // general delay
    
    return(1);
    

}

//////////////////////////////////////////////////////////////////////

char eeprom_read_byte(char address)
{
    char data=0;
    
    while(EECR & 0x02 == 1) ;           // check EEWE BIT IS CLRed
   
    EEARH=0x00;                       // SET MSB BYTE OF ADDRESS
    EEARL = address ;                   // SET LSB BYTE OF ADDRESS
    
    EECR = 0x01 ;                       // SET EERE BIT
    
    #asm
        nop;
        nop;
       
    #endasm
   
    data = EEDR;                   // read data from the EEPROM
    
    return(data);                // RETURN EEPROM data value
         

}

////////////////////////////////////////////////////////////////////////////


void main(void)
{
// Declare your local variables here
    int i=0;        
    int ret=1;                      // to store function return value
    char read_byte=0;               // to store eeprom data value
    bit eeprom_write_enable=1;      // to enable write operation on eeprom
                           
    
    
    
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTA=0x00;
DDRA=0x00;

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

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

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

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

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

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

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;

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

// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: Off
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x08;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x19;

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

  // if 1, perform write opertion on internal EEPROM    
  
if( eeprom_write_enable == 0)
{
   
    ret=write_eeprom_byte(0x10,0x30);      // write value to specified eeprom address
    if(ret == 1)                           // check write successful completion 
        putchar(65) ;                      // display char A on hyperterminal 
    
    ret=0;                                 // clr before reading again
        
    ret=write_eeprom_byte(0x20,0x31);      // write value to specified eeprom address
    if(ret == 1)                           // check write successful completion
        putchar(65) ;                      // display char A on hyperterminal
   
    
}



while (1)
      {      
          
           read_byte = eeprom_read_byte(0x10);   // read data from specified eeprom address
           if(read_byte == 0x30)                 // verify read data with data written to eeprom
                  putchar(read_byte);           // if write_data = read data, display on hyperterminal
          
            read_byte = eeprom_read_byte(0x20);    // read data from specified eeprom address
            if(read_byte == 0x31)                  // verify read data with data written to eeprom
                  putchar(read_byte);               // if write_data = read data, display on hyperterminal
                      
          delay_ms(100);        // display data values every 100 msec on hyperterminal
         
        
        
           
            
      };
}