Analog Comparator on ATmega128 (version 0.4.15)

I am currently using version 0.4.15

Is the analog comparator not implemented in atmega128? I tried an experiment, but it doesn't work

Hi, as far as I know comparator should work.

But if you can share an example of the comparator not working I can have a look.

.

#include <mega128.h>
                     
void main(void)
{
DDRC = 0xFF;    // port c out
DDRE = 0x0;            // port e in
ACSR = 0x0;        // a-comparator setup
SFIOR = 0x0;    // ACME=0, use AIN1

PORTC = 0x00;

while(1){
if((ACSR & 0x20) != 0) // ACO = '1' (AIN0 >= AIN1)?      
     PORTC= 0xFF;
       else  
         PORTC= 0x0F;
}
}