#include <stdio.h>
#include <stdlib.h>
#include <xc.h>


#pragma config FOSC = INTOSC // Oscillator Selection Bits (INTOSC oscillator: I/O function on CLKIN pin)
#pragma config WDTE = OFF // Watchdog Timer Enable (WDT disabled)
#pragma config PWRTE = OFF // Power-up Timer Enable (PWRT disabled)
#pragma config MCLRE = ON // MCLR Pin Function Select (MCLR/VPP pin function is MCLR)
#pragma config CP = ON // Flash Program Memory Code Protection (Program memory code protection is disabled)
#pragma config BOREN = ON // Brown-out Reset Enable (Brown-out Reset enabled)
#pragma config CLKOUTEN = OFF // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)

// CONFIG2
#pragma config WRT = OFF // Flash Memory Self-Write Protection (Write protection off)
#pragma config STVREN = ON // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will cause a Reset)
#pragma config BORV = HI // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.)
#pragma config LPBOR = OFF // Low-Power Brown Out Reset (Low-Power BOR is disabled)
#pragma config LVP = ON // Low-Voltage Programming Enable (Low-voltage programming enabled)

#define _XTAL_FREQ 16000000

int count = 0;

void mydelay_ms(unsigned int cycles) {
unsigned int i;

for (i = 1; i <= cycles; i++) {
__delay_ms(1);
}
}

unsigned int calc_v(void)
{
int result_adc;
unsigned long result_v;

result_adc = ((ADRESH « 2) | ADRESL);
return result_adc;
}

unsigned char read_adc( unsigned char ch)
{
unsigned int ADC = 0;

switch (ch)
{case 0:ADCON0=0b00000000; // ????? 0
break;
case 1:ADCON0=0b00000100; // ????? 1
break;
case 2:ADCON0=0b00001000; // ????? 2
break;
case 3:ADCON0=0b00001100; // ????? 3
break;
}
__delay_ms(1);
ADRESH = 0;
ADRESL = 0;
ADCON0bits.ADON = 1;
__delay_us(20);
ADCON0bits.GO = 1;
while (ADCON0bits.GO)
{
continue;
}
__delay_us(20);
ADC = calc_v();
if (ADC > 140)
{
return 1;
}
else
return 0;
}


void main(void)
{
OSCCONbits.IRCF = 0x0F; //set OSCCON IRCF bits to select OSC frequency=16Mhz
OSCCONbits.SCS = 0x02; //set the SCS bits to select internal oscillator block
LATA = 0x00; // turn all outputs off
OPTION_REGbits.nWPUEN = 1; // all weak pullups are disabled
TRISAbits.TRISA0 = 1; // RA0 = nc (SPDAT)
TRISAbits.TRISA1 = 1; // RA0 = nc (SPCLK)
TRISAbits.TRISA2 = 1; // RA2 = Blue LED
//TRISAbits.TRISA3 = 1; // RA0 = nc (MLCR)
TRISAbits.TRISA4 = 1; // RA4 = nc
TRISAbits.TRISA5 = 0; // RA5 = nc

PORTA = 0;

ANSELA = 0b00010111;
ADCON1 = 0b11110000;
ADCON2 = 0;

while(1)
{
count = read_adc(3);
if (count == 0)
{
PORTA = 0;
mydelay_ms(100);
PORTA = 0x20;
mydelay_ms(25);
PORTA = 0;
}
while(count == 0)
{
PORTA = 0;
count = read_adc(3);
}
}
}
}

result_adc = ((ADRESH« 2) | ADRESL);

result_adc = ((ADRESH« 8) | ADRESL);