uart.c

#define FCY 8000000UL // FCY = FOSC / 2

#include <xc.h>
#include <stdio.h>
#include <libpic30.h>
#include <config.h>

int main(void)
{
    int channel1Result;
        
    /* Set up the ADC Module */
    
    ADCONbits.ADSIDL    = 0;        /* Operate in Idle Mode */
    ADCONbits.FORM      = 0;        /* Output in Integer Format */
    ADCONbits.EIE       = 1;        /* Enable Early Interrupt */
    ADCONbits.ORDER     = 0;        /* Even channel first */
    ADCONbits.SEQSAMP   = 1;        /* Sequential Sampling Enabled */
    ADCONbits.ADCS      = 5;        /* Clock Divider is set up for Fadc/14 */
    
    ADPCFG              = 0xFFFC;   /* AN0 and AN1 are analog inputs */
    ADSTAT              = 0;        /* Clear the ADSTAT register */
    ADCPC0bits.TRGSRC0  = 1;        /* Use SW trigger */
    ADCPC0bits.IRQEN0     = 1;        /* Enable the interrupt   */
    
    ADCONbits.ADON      = 1;        /* Start the ADC module */  
            
    /* Set up the Interrupts */
    
    IFS0bits.ADIF       = 0;        /* Clear AD Interrupt Flag */   
    IPC2bits.ADIP       = 4;        /* Set ADC Interrupt Priority */
    IEC0bits.ADIE       = 1;        /* Enable the ADC Interrupt */
    
    ADCPC0bits.SWTRG0   = 1;        /* Trigger the Conversion Pair 0 */ 
    
    U1BRG = 8; // baudrate
    U1MODEbits.UARTEN = 1; // enable UART
    
    int resistance;
    
    while (1)
    {
        while(ADCPC0bits.PEND0);    /* Wait for the 2nd conversion to
                                       complete */
        channel1Result  = ADCBUF1;  /* Read the result of the second
                                       conversion   */  
        ADCPC0bits.SWTRG0   = 1;    /* Trigger another conversion */    
        
        resistance = channel1Result;
        printf("Resistance %d \n", resistance);
        
        __delay32(30000000);
    }
}

void __attribute__ [1] _ADCInterrupt(void)
{
    /* AD Conversion complete early interrupt handler */
    
    int channel0Result;                  
    
    IFS0bits.ADIF       = 0;        /* Clear ADC Interrupt Flag */
    channel0Result      = ADCBUF0;  /* Get the conversion result */
    ADSTATbits.P0RDY    = 0;        /* Clear the ADSTAT bits */ 
}