New to mikroE C

// ADC test program
 
#include <hth.h>
 
#define _XTAL_FREQ 4000000
#define led RA2
 
unsigned int adc_raw;
 
// Configuration
__CONFIG(FOSC_XT & // Crystal/resonator on RA4 & RA5
WDTE_OFF & // Watchdog timer off
PWRTE_OFF &  // POwer up timer enable off
MCLRE_OFF & // MCLR pin function is digital input, MCLR internally tied to VDD
CP_OFF & // Code protection off
CPD_OFF & // Data code protection off
BOREN_OFF &  // Brown out off
IESO_OFF &  // Internat switchover off
FCMEN_ON); // Fail-Safe clock monitor on
 
// Functions
void adc_init(void)
{
ADCON0bits.ADFM = 1; // Right justified
ADCON0bits.VCFG = 0; // VDD as reference
ADCON0bits.CHS = 0b111; // Analog channel set to AN7
ADCON0bits.ADON = 1; // ADC is enabled
ADCON1bits.ADCS = 0b001; // ADC Conversion Clock Select bit
} // End adc_init
 
void adc_read(void)
{
ADCON0bits.GO = 1;
__delay_us(10);
while(ADCON0bits.nDONE);
} // End adc_read
 
// Main program
void main (void)
{
CMCON0 = 0x07; // Turn off comparators
ANSEL = 0b00001000; // Analog input on RC3/AN7
 
TRISA = 0b00000000;
TRISC = 0b00001000;
 
led = 0;
 
adc_init();
 
while (1)
{
adc_read();
adc_raw = (unsigned int) ADRESH;
adc_raw = adc_raw*256;
adc_raw += (unsigned int) ADRESL;
 
if (adc_raw <= 512)
{
led = 1;
__delay_ms(500);
led = 0;
__delay_ms(500);
}
else
{
led = 1;
__delay_ms(100);
led = 0;
__delay_ms(100);
}
}
}

unsigned char txt[12]; // used to hold general display texts

ByteToStr(ADRESH,txt); // makes byte 0-255 to txt "  0" to "255"
LCD_Write(0,0,txt);  // display it