Reading and Writing to AVR's EEPROM

Development Boards MicroMod
1

Hi there,

I am using ATmega16 and want to write a character or any data to EEPROM of AVR? Is the following function call correct? How many other ways you can use the functions? Thanks

void EEPROM_write(unsigned int uiAddress, unsigned char ucData);

unsigned char EEPROM_read(unsigned int uiAddress);




void main(void) 
{ 

   EEPROM_write(0x10, 'A');  //write A to the add. 0x10 assuming there is such an add.
   EEPROM_read(0x10); //
    
}






void EEPROM_write(unsigned int uiAddress, unsigned char ucData)
{
	while(EECR && (1<<EEWE));	/* Wait for completion of previous write */
	EEAR = uiAddress;	/* Set up address and data registers */
	EEDR = ucData;
	EECR |= (1<<EEMWE);	/* Write logical one to EEMWE */
	EECR |= (1<<EEWE);	/* Start eeprom write by setting EEWE */
}



unsigned char EEPROM_read(unsigned int uiAddress)
{
	while(EECR && (1<<EEWE)) ;	/* Wait for completion of previous write */
	EEAR = uiAddress;	/* Set up address register */
	EECR |= (1<<EERE);	/* Start eeprom read by writing EERE */
	return EEDR;	/* Return data from data register */
}
2

Hi there,

To test if the write and read functions for EEPROM works, I devised the following little test. When I keep the function call of EEPROM_write(0x10, write); , I get the result I expect. But when I comment out this function. I do not read the expected character T. The character T should have already been saved there and I should get a reading from EEPROM of T. What is going on here. Thanks

  void EEPROM_write(unsigned int uiAddress, unsigned char ucData);
unsigned char EEPROM_read(unsigned int uiAddress);

void transmit(unsigned char data);
unsigned char receive(void);
void InitUART(void);



void main(void)
{
	char write='T';
	char read;
	InitUART();
	//EEPROM_write(0x10, write); 
	read=EEPROM_read(0x10); //
	transmit(read);
	

   
}


void EEPROM_write(unsigned int uiAddress, unsigned char ucData)
{
   while(EECR && (1<<EEWE));   /* Wait for completion of previous write */
   EEAR = uiAddress;   /* Set up address and data registers */
   EEDR = ucData;
   EECR |= (1<<EEMWE);   /* Write logical one to EEMWE */
   EECR |= (1<<EEWE);   /* Start eeprom write by setting EEWE */
}



unsigned char EEPROM_read(unsigned int uiAddress)
{
   while(EECR && (1<<EEWE)) ;   /* Wait for completion of previous write */
   EEAR = uiAddress;   /* Set up address register */
   EECR |= (1<<EERE);   /* Start eeprom read by writing EERE */
   return EEDR;   /* Return data from data register */
}