38 lines
1.7 KiB
C
38 lines
1.7 KiB
C
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#include <detpic32.h>
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#define SAMPLES 16
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int main() {
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TRISBbits.TRISB4 = 1; // RB4 digital output disconnected
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AD1PCFGbits.PCFG4 = 0; // RB4 configured as analog input (AN4)
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AD1CON1bits.SSRC = 7; // Conversion trigger selection bits: in this
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// mode an internal counter ends sampling and
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// starts conversion
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AD1CON1bits.CLRASAM = 1; // Stop conversions when the 1st A/D converter
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// interrupt is generated. At the same time, hardware
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// clears the ASAM bit
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AD1CON3bits.SAMC = 16; // Sample time is 16 TAD (TAD = 100 ns)
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AD1CON2bits.SMPI = SAMPLES - 1; // Interrupt is generated after 16 samples
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AD1CHSbits.CH0SA = 4; // Selects AN4 as input for the A/D converter
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AD1CON1bits.ON = 1; // Enable A/D converter
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while (1) {
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AD1CON1bits.ASAM = 1; // Start conversion
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while (IFS1bits.AD1IF == 0); // Wait while conversion not done
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int total = 0;
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int *p = (int *)(&ADC1BUF0);
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for (; p <= (int *)(&ADC1BUFF); p+=4)
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total += *p;
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int val_ad = total / SAMPLES;
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int v = (val_ad * 33 + 511) / 1023;
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printStr("VAL_AD value: ");
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printInt(val_ad, 10 | 4 << 16); // Print ADC1BUF0 value
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printStr(" | V value: ");
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printInt(v, 10 | 4 << 16); // Print ADC1BUF0 value
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putChar('\r');
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IFS1bits.AD1IF = 0; // Reset AD1IF
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}
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return 0;
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}
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