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need help with adc in pic 18f452

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linkstatic

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Code: 
#pragma config OSC=HS,OSCS=OFF
#pragma config  BOR=ON,BORV=45,PWRT=ON
#include<P18F452.h>
#include<delays.h>

void main()

{

TRISC=0;
TRISD=0;
TRISAbits.TRISA0=1;
ADCON0=0x81;
ADCON1=0xCE;
while(1)
{
Delay10TCYx(1);
ADCON0bits.GO=1;
while(ADCON0bits.DONE==1);
PORTC=ADRESL;
PORTD=ADRESH;

}

}

i just wanted to know do i have to connect the (vref +) to +5v and (vref-) to ground? and is the code right or not?
 

linkstatic said:
Code: 
#pragma config OSC=HS,OSCS=OFF
#pragma config  BOR=ON,BORV=45,PWRT=ON
#include<P18F452.h>
#include<delays.h>

void main()

{

TRISC=0;
TRISD=0;
TRISAbits.TRISA0=1;
ADCON0=0x81;
ADCON1=0xCE;
while(1)
{
Delay10TCYx(1);
ADCON0bits.GO=1;
while(ADCON0bits.DONE==1);
PORTC=ADRESL;
PORTD=ADRESH;

}

}

i just wanted to know do i have to connect the (vref +) to +5v and (vref-) to ground? and is the code right or not?
Click to expand...

with ADCON1=0xCE;
PCFG3:pCFG0: A/D Port Configuration Control bits=1110
AN0 is analog input pin and Vref+ to Vdd and Vref- to Vss
See page 184 of datasheet

You have not mentioned what you want to do with the ADC output, if anything is connected (and how) to output port(s) etc.

It appears that you want to show the result to PORTC and PORTD. Low byte appears on PORTC and high byte on portD.
Code C - [expand]
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while(1)
{
Delay10TCYx(1);
ADCON0bits.GO=1;
while(ADCON0bits.DONE==1);
PORTC=ADRESL;
PORTD=ADRESH;
//<---------------------------------------------Put some delay 200ms to 250 ms
}
Click to expand...
 
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