Microchip Technology dsPIC30F - Page 452

dsPIC30F Family Reference Manual
DS70065C-page 18-22 © 2004 Microchip Technology Inc.
Example 18-3: Sampling and Converting a Single Channel
Multiple Times Code Example
ADPCFG = 0xFFFB; // all PORTB = Digital; RB2 = analog
ADCON1 = 0x00E0; // SSRC bit = 111 implies internal
// counter ends sampling and starts
// converting.
ADCHS = 0x0002; // Connect RB2/AN2 as CH0 input ..
// in this example RB2/AN2 is the input
ADCSSL = 0;
ADCON3 = 0x0F00; // Sample time = 15Tad, Tad = internal Tcy/2
ADCON2 = 0x003C; // Interrupt after every 16 samples
ADCON1bits.ADON = 1; // turn ADC ON
while (1) // repeat continuously
{
ADCValue = 0; // clear value
ADC16Ptr = &ADCBUF0; // initialize ADCBUF pointer
IFS0bits.ADIF = 0; // clear ADC interrupt flag
ADCON1bits.ASAM = 1; // auto start sampling
// for 31Tad then go to conversion
while (!IFS0bits.ADIF); // conversion done?
ADCON1bits.ASAM = 0; // yes then stop sample/convert
for (count = 0; count < 16; count++) // average the 16 ADC value
ADCValue = ADCValue + *ADC16Ptr++;
ADCValue = ADCValue >> 4;
} // repeat