mplab programe for ADC converter (pic16f884)

Code C - [expand]
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#include <pic.h>
#define _XTAL_ FREQ 4000000
void cp2102_out(unsigned char data);
unsigned int a2d_result;
unsigned int voltage;
unsigned char dig1;
unsigned char dig2;
 
void main()
{
TRISA=0X01; //RA0 is analogue input
TRISB=0;
TRISC=0X80; //RC6 as TX, RC7 as RX
PORTC=0;
 
ADCON0=0X41;    //Fosc/8 , ch-0 , AD ON
ADCON1=0X0E;    //left justify, RA0 analogue , VDD & VSS Vref
OPTION=0X07;    
TMR0=0;
 
TXSTA=0X24; //transmitting control
RCSTA=0X90; //receiving control
SPBRG=25;   //boud rate
 
T0IF=0; //interrupt controlls
T0IE=1; //      ''
ADIF=0; //      ''
ADIE=1; //      ''
PEIE=1; //      ''
GIE=1;  //interrupt controlls
 
dig1=voltage/10;
dig2=voltage%10;
 
while(1)
{
cp2102_out(dig1+0x30);  //data out to usb
cp2102_out('.');
cp2102_out(dig2+0x30);  //data out to usb
}
}
 
void interrupt isr()
{
double temp;
 
if(T0IF==1){    //wait for capacitor charging
    GO=1;       //A2D convertion start
    T0IF=0;
}
if(ADIF==1){    //digital convertion
    a2d_result=0;
    a2d_result=ADRESH;
    a2d_result=a2d_result<<2;
    ADRESL=ADRESL>>6;
    a2d_result=a2d_result + ADRESL;
ADIF==0;
}
temp=(double)50/(double)1023;
voltage = temp * (double)a2d_result;
}
 
void cp2102_out(unsigned char data)
{
while(!TXIF){
}
TXREG=data;
}