PIC MCU: Two ADC inputs help

Question

So currently mucking around with the ADC on my PIC16F917. I got single button functions going and all works well.

What I'd really love help with, is how to make the MCU accept 2 inputs, without the second being an ISR.

How can I modify this code, to make it so when, say AN1 goes > 512, PORTDbits.RD1 goes high, alongside AN0 and RD0. Acting like two separate systems, but working simultaneously. Is it actually even possible?

Thanks again, Ezra

#include <xc.h>
#include "config-bits.h"

#define _XTAL_FREQ 4000000

void delay()
{
    int i;

    for(i=0; i<5000; i++)
    {
        /*Timer Stuff*/
    }
}

int main()
{
    TRISD=1;                    //Set all D pins to input

    TRISDbits.TRISD0 = 0;       //LED output
    ANSELbits.ANS0 = 1;         //Select ADC input

    ADCON0bits.ADFM = 1;        //ADC result is right justified
    ADCON0bits.VCFG = 0;        //Vdd is the +ve reference
    ADCON1bits.ADCS = 0b001;    //Fosc/8 is the conversion clock
                                //This is selected because the conversion
                                //clock period (Tad) must be greater than 1.5us.
                                //With a Fosc of 4MHz, Fosc/8 results in a Tad
                                //of 2us.
    ADCON0bits.CHS =  0;        //select analog input, AN2
    ADCON0bits.ADON = 1;        //Turn on the ADC

    int result;

    while(1)
    {
        __delay_us(5);                  //Wait the acquisition time (about 5us).

        ADCON0bits.GO = 1;              //start the conversion
        while(ADCON0bits.GO==1){};      //wait for the conversion to end

        result = (ADRESH<<8)+ADRESL;    //combine the 10 bits of the conversion

        if(result > 512)
        {
            PORTDbits.RD0 = 1;
            delay();
            PORTDbits.RD0 = 0;
            delay();
        }
        else
        {
            PORTDbits.RD0 = 0;
        }
    }
}

Answer 1

With this PIC true simultaneity is not possible, as there is only one sample and hold and one converter. If nearly is good enough, then adjusting your code to simply switch between inputs would work. If not, then a PIC with more than one ADC/Sample and Holds would be the way to go, e.g. a dsPIC such as the dsPIC33FJ128GP802. Or of course you could add an external ADC.