#include <pic.h>

__CONFIG(INTCLK & WDTDIS & PWRTDIS & MCLREN & UNPROTECT & UNPROTECT & BORDIS & IESODIS & FCMDIS);

/* A2D module initalization*/
void init_a2d(void)
{
	ADCON1 = 0x60;	// select sample rate
	ADFM = 0;		// left justify result
	VCFG = 0;		// VDD reference voltage
	ADON = 1;		// turn on ADC
}

/* Return an 8 bit result */
unsigned char read_a2d(unsigned char channel)
{
	volatile unsigned int value;	
	ADCON0 &= 0xC1;			// clear current channel select
	ADCON0|=(channel<<2);	// apply the new channel select
	GODONE=1;				// initiate conversion on the selected channel
	while(GODONE)continue;
	return(ADRESH);			// return an 8 bit result
}

void main(void)
{
	unsigned int x;
	GIE=0;			// no interupts
	TRISA = 0x4;
	TRISC = 0x00;	
	ANSEL = 0x4;
	ANSELH = 0x0;		
	
	init_a2d();		// initialize the A2D module
	
	while(1)
	{
		x=read_a2d(2);		// sample the analog value on AN2
		if (x > 186)
		{
			PORTC = 0xFF;
		}	
		else
		{
			PORTC = 0;
		}		
	}
}