AVR-Chat

On Tue, Apr 26, 2005 at 06:10:12PM -0000, arhodes19044 wrote:
> 
> OK, I like this technique because _I_ do not have to keep track of 
> the address of variables in EEPROM.  But....
> 
> Always a but.  How do I use this command.  I tried it in the C 
> source inside main().  This gave errors.  
> 
> I then put it into the makefile, and I got no errors, but who knows 
> what it did with the command.  When I referenced the variable, I got 
> an "undeclared" error.
> 
> So, where I I put the command you suggest, and then how do I use the 
> resulting variable?

I don't quite follow your problem. Does this answer your question?

#include <avr/eeprom.h>

typedef struct {
	int	a,
		b,
		c;
	char	s[32];
} EEDATA;

EEDATA eedata __attribute__ ((section (".eeprom")));
EEDATA data;

void
main()
{
	while(1) {
		data.a = 0;
		eeprom_read_block( &data, &eedata, sizeof(data) );
		
		data.a++;
		eeprom_write_block( &data, &eedata, sizeof(data) );
	}
}

-- 
David Kelly N4HHE, dkelly@HiWAAY.net
========================================================================
Whom computers would destroy, they must first drive mad.