18.6.3 Example 3

RDC Configuration Code

int main()
{
	/*Excitation output remap goes here*/

	/*ADC configuration goes here*/

	/*CIC filter configuration */
	_CICOSRIE = 1;                // Enable output sample read interrupt
	CICCON1bits.CH0EN = 1;        // Enable CIC filter channel 0
	CICCON1bits.CH1EN = 1;        // Enable CIC filter channel 1
	CICCON1bits.INSRC = 0;       /* CIC filter channels are fed from sampled values of
									 excitation signal*/
	CICCON1bits.ORDER = 0;        // CIC filter in order 1
	CICDECIMbits.DECIM = 3;       // filter length is 4
	CICCON1bits.POLSEL = 0;       // CIC uses RDC excitation signal for polarity
	CICCON1bits.DEMODEN = 1;      // Demodulation is enabled
	CICCON1bits.ON = 1;           // CIC filter is enabled

	/*RDC configuration to generate excitation signal*/
	RDCINSELbits.IMUX0 = 0;      // CIC filter channel 0 is sourced with digital samples by ADC
								  // module instance 1
	RDCINSELbits.ICHAN0 = 0;      // ADC1 channel 0 sources CIC filter channel 0
	RDCINSEL.IMUX1 = 1;      	/* CIC filter channel 1 is sourced with digital samples by
									 ADC module instance 2*/
	RDCINSELbits.ICHAN1 = 1;      // ADC2 channel 1 sources CIC filter channel 1
	RDCEXCCONbits.EXCFDIV = 1;    // (RDC input clock/16)
	RDCEXCDLYbits.EXCFBDLY = 10;  // Feedback delay of 10 system clock cycles
	RDCEXCDLYbits.ADCTRGDLY = 1;   /* 1 RDC clock phase delay between RDC excitation clock
									 output signal and the trigger signal to ADC*/
	RDCCONbits.ON = 1;            // Enable RDC block
	RDCEXCCONbits.SYNCCNT = 255;  /* Sync pulse will be generated after counting 255 RDC
									 clocks*/
	RDCEXCCONbits.EXCSYNCEN  = 1; // Enable synchronization
	while(1);
}
void __attribute__((interrupt, no_auto_psv)) _CICOUTInterrupt(void)
{
	_CICOSRIF = 0;                // Clear output sample read interrupt flag
	/*Read CIC0OUT and CIC1OUT register here*/

}