Subversion Repositories Code-Repo

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
155 Kevin 1 
#include <xc.h>
2 
#include "defines.h"
158 Kevin 3 
#include "base_ADC.h"
155 Kevin 4 
 
5 
static ADC_DATA *adc_data_p;
6 
 
7 
void ADC_Init(ADC_DATA *data, char TAD, char FOSC) {
8 
    adc_data_p = data;
9 
 
10 
    ADC_AN0_TRIS = 1;
11 
    ADC_AN1_TRIS = 1;
12 
    ADC_AN2_TRIS = 1;
13 
 
14 
    adc_data_p->last_channel = 0;
15 
    adc_data_p->result = 0;
16 
 
17 
    ADCON0bits.VCFG1 = 0; // VRef- = AVss
18 
    ADCON0bits.VCFG0 = 1; // VRef+ != AVdd
19 
    ADCON1bits.ADFM = 1; // Right justified result
20 
    ADCON1bits.ADCAL = 1; // Calibrate A/D
21 
    ADCON1bits.ACQT = TAD;
22 
    ADCON1bits.ADCS = FOSC;
23 
    ADCON0bits.ADON = 1; // Enable A/D module
24 
 
25 
    ADCON0bits.GO_DONE = 1; // Start calibration
26 
    while (ADCON0bits.GO_DONE); // Wait for calibration to finish
27 
    PIR1bits.ADIF = 0;  // Clear the IF flag
28 
    ADCON1bits.ADCAL = 0; // Normal A/D operation
29 
 
30 
    PIE1bits.ADIE = 1; // Enable A/D interrupt
31 
 
32 
}
33 
 
34 
void ADC_Start(char channel) {
35 
    adc_data_p->last_channel = channel;
36 
    ADCON0bits.CHS = channel; // Set A/D channel
37 
    ADCON0bits.GO_DONE = 1; // Start A/D conversion
38 
}
39 
 
40 
void ADC_Stop() {
41 
    ADCON0bits.ADON = 0; // Disable A/D module
42 
}
43 
 
44 
void ADC_Interrupt_Handler() {
45 
    adc_data_p->result = ADRES;
46 
}
47 
 
48 
char ADC_Get_Result(unsigned int* ret) {
49 
    if (ADCON0bits.GO_DONE) {
50 
        return 0;
51 
    } else {
52 
        *ret = adc_data_p->result;
53 
        return 1;
54 
    }
55 
}