adc using pic18f45k22 microcontroller

#include <htc.h>
#include <stdlib.h>
#include <math.h>



#pragma config FOSC = INTIO67 //     FOSC = INTIO67       Internal oscillator block
#pragma config PLLCFG = ON //     PLLCFG = ON          Oscillator multiplied by 4
#pragma config PRICLKEN = ON //     PRICLKEN = ON        Primary clock enabled
#pragma config FCMEN = OFF //     FCMEN = OFF          Fail-Safe Clock Monitor disabled
#pragma config IESO = OFF //     IESO = OFF           Oscillator Switchover mode disabled
#pragma config PWRTEN = ON //     PWRTEN = ON          Power up timer enabled
#pragma config BOREN = OFF //     BOREN = OFF          Brown-out Reset disabled in hardware and software
#pragma config WDTEN = OFF //     WDTEN = OFF          Watch dog timer is always disabled. SWDTEN has no effect.
#pragma config CCP2MX = PORTB3 //     CCP2MX = PORTB3      CCP2 input/output is multiplexed with RB3
#pragma config PBADEN = OFF //     PBADEN = OFF         PORTB<5:0> pins are configured as digital I/O on Reset
#pragma config HFOFST = ON //     HFOFST = ON          HFINTOSC output and ready status are not delayed by the oscillator stable status
#pragma config T3CMX = PORTB5 //     T3CMX = PORTB5       T3CKI is on RB5
#pragma config P2BMX = PORTC0 //     P2BMX = PORTC0       P2B is on RC0
#pragma config MCLRE = EXTMCLR //     MCLRE = EXTMCLR      MCLR pin enabled, RE3 input pin disabled
#pragma config STVREN = OFF //     STVREN = OFF         Stack full/underflow will not cause Reset
#pragma config LVP = OFF //     LVP = OFF            Single-Supply ICSP disabled
#pragma config XINST = OFF //     XINST = OFF          Instruction set extension and Indexed Addressing mode disabled (Legacy mode)
#pragma config DEBUG = OFF //     DEBUG = OFF          Disabled



void ADCInit(void)

{
	ADCON0 =	0b00000000;
			//0		        Unimplemented
			//-00000--		Analog Channel Select bit,00000=AN0
			//------0-		A/D conversion status bit. 1=in progress
			//-------0		ADC enable bit. 0=ADC disabled. 1=ADC enable

	ADCON1 =	0b00000000;
			//0-------		Trigger select bit, 0=CCP5, 1=CTMU
			//-000----		Unimplemented
			//----00--		A/D VRef+ connected to internal signal
			//------00		A/D Vref- connected to internal signal

	ADCON2 =	0b10000111;
			//1-------		0=left justify, 1=right justify
			//-0------		Unpmplemented
			//--000---		ADC clock source selected to Frc
			//-----111		Clock from internal oscillator

	

}

unsigned int ADCRead(unsigned char ch)

{

	if (ch>13) return 0;		// Invalid channel
	ADCON0 = (ch<<0);		// Select ADC Channel
	ADON=1;				// Switch on the ADC module
	GODONE=1;			// Start conversion
	while(GODONE);			// Wait forthe conversion to finish
		ADON=0;			// Switch off ADC
	return ADRES;			// Return value of the ADC

}

void main(void)

{
	
	TRISB = 0b00000000;		// All B ports are outputs
	

	int ADCRead=0;
	int voltage1=0;
	int voltage2=0;
	int dB=0;
	int i=1;
	/*int doseage [28800];*/
	int j=0;


	while(1)
	{
		ADCRead = ReadADC();
		voltage1= ADCRead/1024;
		voltage2= voltage1-2.5;
		

		if(voltage2<0)
		{
			voltage2=-(voltage2);
		}
		
		dB=log(voltage2/.0003)*123.3 ;

		
		/*if(i=8000000)
		{ 
			doseage[j]=dB;
			i=0;
			j=j+1;
		}
		*/
		
		PORTB |= 0x01; //Turn LED0 on
		PORTB &= (~1x01); //Turn LED0 off
		PORTB &= (~2x01); //Turn LED0 off
		PORTB &= (~3x01); //Turn LED0 off
		PORTB &= (~4x01); //Turn LED0 off
		PORTB &= (~5x01); //Turn LED0 off
		PORTB &= (~6x01); //Turn LED0 off
		
		if(dB>65)
		{
			PORTB |= (1x01); 
			
		}
		
		if(dB>75)
		{
			PORTB |= (2x01);
		}
		
		if(dB>85)
		{
			PORTB |= (3x01);
		}
		
		if(dB>95)
		{
			PORTB |= (4x01);
		}

		if(dB>105)
		{
			PORTB |= (5x01);
		}

		if(dB>115)
		{
			PORTB |= (6x01);
		}
		
		i=i+1;


	}

}

PORTB |= 0x01; //Turn LED0 on
		PORTB &= (~1x01); //Turn LED0 off
		PORTB &= (~2x01); //Turn LED0 off
		PORTB &= (~3x01); //Turn LED0 off
		PORTB &= (~4x01); //Turn LED0 off
		PORTB &= (~5x01); //Turn LED0 off
		PORTB &= (~6x01); //Turn LED0 off