The search for a comparator better than the Internal Arduino comparator

[zom123]

I already know that the problems with the Arduino uno's internal comparator come from the lack
of hysteresis. So I used an ATtiny1614, which has a comparator with hysteresis.
I started testing the comparator with the simplest possible case. I apply voltages to its
inputs (+) and (-) and look at the output result - whether the LED lights up or
not depending on the relationship of the voltages at (+) and (-). But I don't see
any response from the comparator. I have tried everything and nothing. What could I be doing wrong ?
There is no help in the datasheet. The language for describing the pin functions is strange,
I don't find it in C++ or in the datasheet. What else can be done ?

#include <avr/io.h>
#include <stdio.h>
#define F_CPU 16000000

// pin definition
#define POS_INPUT   AC_MUXPOS_PIN0_gc    // PA7
#define NEG_INPUT   AC_MUXNEG_PIN0_gc  // PA6



int main(void) 
{    
  PORTA.DIRCLR = PIN6_bm;  // input pin of  AC0
  PORTA.DIRCLR = PIN7_bm;   // input pin of  AC0
  
    // AC0 input setings
      AC0.MUXCTRLA = POS_INPUT | NEG_INPUT;

    // AC0 output setting
    AC0.CTRLA =  AC_ENABLE_bm | AC_OUTEN_bm;  

    PORTA.DIR = PIN3_bm;  // LED as AC0 output test
    
    while (1) 
    {
        if (AC0.STATUS & AC_STATE_bm)     
        {
           PORTA_OUTSET =  PIN3_bm;   // LED ON
        } 
        else 
        {           
             PORTA_OUTCLR =  PIN3_bm;   // LED OFF        
        }
    }
}

Problem was solved due to 6v6gt.

[gilshultz]

@zom123

Arduino uno's internal comparator come from the lack
of hysteresis

You are missing connections, assuming the green blob is the comparator. Draw it is schematic form, that will give you the answer.