#include "DSP281x_Device.h"

/*** Global variables used by ADC_ISR() (Labs 6 and 7) ***/
#define AdcBuf_len	511				// ADC buffer length
Uint16 AdcBuf_A[AdcBuf_len];			// ADC buffer allocation
Uint16 AdcBuf_B[AdcBuf_len];
/*********************************************************************/
interrupt void ADC_ISR(void)		// 0x000D4A  ADCINT (ADC)
{
static Uint16 *AdcBuf_A_ptr = AdcBuf_A;			// Pointer to buffer
static Uint16 *AdcBuf_B_ptr = AdcBuf_B;

	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;		// Must acknowledge the PIE group

/*** Manage the ADC registers ***/
	AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;			// Reset SEQ1 to CONV00 state
	AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;			// Clear ADC SEQ1 interrupt flag

/*** Read the ADC result ***/
	*AdcBuf_A_ptr++ = AdcRegs.ADCRESULT0 >> 4;	// Read the result
	*AdcBuf_B_ptr++ = AdcRegs.ADCRESULT1 >> 4;
/*** Brute-force the circular buffer ***/
	if( AdcBuf_A_ptr == (AdcBuf_A + AdcBuf_len) )
	{
		AdcBuf_A_ptr = AdcBuf_A;					// Rewind the pointer to beginning
		AdcBuf_B_ptr = AdcBuf_B;
	}
} // end ADCINT_ISR()