The servo code didn't work

Other Hardware Motors, Mechanics, Power and CNC
19

Now, I found the block was in ADC, i am not sure it is suitable to attach the ADC code here or I should open a new thread. Since it was part of my question, so I just attach them here:

	if(knob == 1){
	ADMUX |= (1<<MUX0);
	ADMUX &= 0b11110001; 
	} else if(knob == 0){
	ADMUX &= 0b11110000;	
	}
	
	int readingInterH = 0;
	int readingInterL = 0;
	int readingInter = 0;
	ADCSRA |= 1<<ADSC;
	readingInterH = ADCH;
	readingInterL = ADCL;
	readingInter = (ADCH<<8)|ADCL;
	readingInter = readingInter>>6;
	reading = readingInter / 1023.0;

Is there any issue I lost?