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#include <xc.h>

#include "defines.h"

#include "adc.h"

static ADC_DATA *adc_data_p;

void ADC_Init(ADC_DATA *data, char TAD, char FOSC) {

    adc_data_p = data;

    ADC_AN0_TRIS = 1;

    ADC_AN1_TRIS = 1;

    ADC_AN2_TRIS = 1;

    adc_data_p->last_channel = 0;

    adc_data_p->result = 0;

    ADCON0bits.VCFG1 = 0; // VRef- = AVss

    ADCON0bits.VCFG0 = 1; // VRef+ != AVdd

    ADCON1bits.ADFM = 1; // Right justified result

    ADCON1bits.ADCAL = 1; // Calibrate A/D

    ADCON1bits.ACQT = TAD;

    ADCON1bits.ADCS = FOSC;

    ADCON0bits.ADON = 1; // Enable A/D module

    ADCON0bits.GO_DONE = 1; // Start calibration

    while (ADCON0bits.GO_DONE); // Wait for calibration to finish

    PIR1bits.ADIF = 0;  // Clear the IF flag

    ADCON1bits.ADCAL = 0; // Normal A/D operation

    PIE1bits.ADIE = 1; // Enable A/D interrupt

}

void ADC_Start(char channel) {

    adc_data_p->last_channel = channel;

    ADCON0bits.CHS = channel; // Set A/D channel

    ADCON0bits.GO_DONE = 1; // Start A/D conversion

}

void ADC_Stop() {

    ADCON0bits.ADON = 0; // Disable A/D module

}

void ADC_Interrupt_Handler() {

    adc_data_p->result = ADRES;

}

char ADC_Get_Result(unsigned int* ret) {

    if (ADCON0bits.GO_DONE) {

        return 0;

    } else {

        *ret = adc_data_p->result;

        return 1;

    }

}