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Interrupt-Driven ADC Sampling
12-21
Analog-to-Digital Converter
ADCON2 = decimation & 0xFF; // LSB of decimation
ADCON3 =(decimation>>8) & 0x07; // MSB of decimation
ADCON1 = 0x01; // bipolar, auto, self calibration, offset, gain
printf (”Calibrating. . .\n”);
for (k=0; k<4; k++)
{
// Wait for Four conversions for filter to settle
// after calibration. We go to sleep. When we wake
// up, the interrupt will have read the sample.
PCON |= 0x02; // Go to power−down until sample ready
}
samples = 10; // The number of voltage samples we will average
while(1)
{
ave = 0;
for (i = 0; i < samples; i++)
{
PCON |= 0x02; // Go to power−down until sample ready
ave += bipolar() * LSB; // This read clears ADCIRQ
}
printf(“Average sample=%f\n”, ave / samples);
}// while
} //main