unsigned int read_adc(unsigned char adc_input)
{
ADMUX=adc_input | 0xff;
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSR|=0x40;
// Wait for the AD conversion to complete
while ((ADCSR & 0x10)==0);
ADCSR|=0x10;
return ADCW;
}

//настройки портов

void main(void)
{ int a = 0;

   while(1)
   {
    a = (int)read_adc;
    PORTC.6 = 1;
    delay_ms(a);
    PORTC = 0x00;
    }
}

ADMUX=adc_input | 0xff;

a = (int)read_adc;

a = (int)read_adc(0);

unsigned int a = 0;
...
a = read_adc(0);

ADMUX=adc_input | 0xff;

ADMUX=adc_input | 0xff;

/*****************************************************
This program was produced by the
CodeWizardAVR V1.25.7a Evaluation
Automatic Program Generator
© Copyright 1998-2007 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project :
Version :
Date    : 02.11.2007
Author  : Freeware, for evaluation and non-commercial use only
Company :
Comments:


Chip type           : ATmega163
Program type        : Application
Clock frequency     : 4,000000 MHz
Memory model        : Small
External SRAM size  : 0
Data Stack size     : 256
*****************************************************/

#include <mega163.h>  
#include <stdio.h>  
#include <stdlib.h>  
#include <io.h>
#include <stdint.h>  
#include <delay.h>  

#define F_CPU 4000000UL


// Read the AD conversion result
unsigned int read_adc(unsigned char adc_input)
{
ADMUX=adc_input;
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSR|=0x40;
// Wait for the AD conversion to complete
while ((ADCSR & 0x10)==0);
ADCSR|=0x10;
return ADCW;
}


// ADC initialization
// ADC Clock frequency: 115,200 kHz
// ADC Voltage Reference: Int., cap. on AREF

                      
void init_avr(void)
{

PORTA=0x00;
DDRA=0x00;

PORTB=0x00;
DDRB=0x00;

PORTC = 0x00;
DDRC = 0xF0;/* set port C pins 7-4 as outputs, 3-0 as inputs */

PORTD=0x00;
DDRD=0x0F;

// Global enable interrupts
#asm("sei")

}

// Declare your global variables here

void main(void)
{ unsigned int a = 0;
  
PORTD = 0x00;
PORTC = 0x00;
// Declare your local variables here

init_avr();

while (1)
      
      {
                 a = read_adc(0);                  
                 PORTC.6 = 1;  
                 delay_ms(a);
                 PORTC = 0x00;
                 delay_ms(a);
      
      
      };
}

#define ADC_CONTROL (1 << ADEN)|(0 << ADIE)|(0 << ADPS2)|(1 << ADPS1)|(1 << ADPS0)
#define MUX_CONTROL (0 << REFS1)|(0 << REFS0)|(0 << ADLAR) // ARef / 10 bit

int ReadAdc(unsigned char channel)
{
    ADMUX = MUX_CONTROL | channel;
    ADCSR = ADC_CONTROL | (1 << ADSC);

    while ( (ADCSR & (1 << ADIF)) == 0); // wait till conversion completes
    return ADCW;
}