sends values read from the analog channel of a pic microcontroller over UART

serial_send.c

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

#pragma config FOSC=IRC,MCLRE=OFF,WDTEN=0,LVP=OFF,BOREN=OFF

//Functions
void setup(void);
unsigned int read_analog_channel(void);
void config_usart(void);

//Variables
int value,voltage = 0;

void main(void)
{
    setup();
    config_usart();
    while(1)
    {
        value = read_analog_channel();
        
        printf("%d\n", value);
        Delay10KTCYx(30);
        
        
    }   
    
}

void putch(char data) // this function is required for printf to work properly, got it from the xc8 manual
{  
     while (!TXIF)    
         continue;    
     TXREG = data; 
}

void setup(void)
{
    OSCCON = 0b01100011; //internal oscillator block, 8MHz clock speed.
    ANSELbits.ANS4 = 1; // pin 3 configured as an analog input
    TRISC = 0b00000000;
    TRISB = 0b00000000;
    ADCON0 = 0b00010000;// AN4 is the channel being looked at, analog channel currently disabled, ( less power consumption)
    ADCON2 = 0b00000011;// a/d conversion clock (dedicated clock)
    
    
}

void config_usart(void)
{
    TXSTAbits.TXEN = 1; // transmit enabled
    TXSTAbits.SYNC = 0; // asynchronous mode
    RCSTAbits.SPEN = 1; // usart enabled, tx set as output
    SPBRG = 12;         // baud rate = 9600
}

unsigned int read_analog_channel (void)
{
    voltage = 0;
    ADCON0bits.ADON = 1;
    Delay1TCY(); 
    Delay1TCY();// 8us Delay for capacitor charge
    ADCON0bits.GO = 1;
    
    while(ADCON0bits.GO); // wait for conversion to complete
    
    voltage = ADRESH;
    voltage = (voltage<<2) + (ADRESL>>6);
    Delay1TCY();
    return voltage;
}