AD1DA2Pmod.c

//AD1DA2Pmod.c  PmodAD1 PmodDA2 ADC- FIR Digital Filter Example
//ECE3622    c2020 Dennis Silage

#include "xparameters.h"
#include "xil_io.h"
#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
#include "sleep.h"
#include "math.h"

//AD1Pmod from Address Editor in Vivado, first IP
#define AD1acq 	0x43C00000	//AD1 acquisition	  - output
#define AD1dav 	0x43C00004	//AD1 data available  - input
#define AD1dat1	0x43C00008	//AD1 channel 1 data  - input
#define AD1dat2	0x43C0000C	//AD1 channel 2 data  - input

//DAC2Pmod from Address Editor in Vivado, second IP
#define DA2acq  0x43C10000   //DA2 acquisition    - output
#define DA2dav	0x43C10004	 //DA2 data available - input
#define DA2dat1	0x43C10008	 //DA2 channel 1 data - output
#define DA2dat2 0x43C1000C	 //DA2 channel 2 data - output

int main(void)
{
	int adcdav;		//ADC data available
	int adcdata1;	//ADC channel 1 data
	int	adcdata2;	//ADC channel 2 data

	int dacdata1;	//DAC channel 1 data
	int dacdata2;	//DAC channel 2 data
	int dacdav;		//DAC data available

	int x1a;		//FIR x(m)
	int x1b;		//    x(m-1)
	int x1c;		//	  x(m-2)
	int x1d;		//	  x(m-3)
	int y1a;		//	  y(m)

	xil_printf("\n\rStarting AD1-DA2 Pmod FIR example...\n");
	Xil_Out32(AD1acq,0);		//ADC stop acquire
	adcdav=Xil_In32(AD1dav);	//ADC available?
	while(adcdav==1)
		adcdav=Xil_In32(AD1dav);
	Xil_Out32(DA2acq,0);		//DAC stop acquire
	dacdav=Xil_In32(DA2dav);	//DAC available?
	while(dacdav==1)
		dacdav=Xil_In32(DA2dav);

	while (1)
	{
		//ADC
		Xil_Out32(AD1acq,1); 			//ADC acquire
		while (adcdav==0)				//ADC data available?
			adcdav=Xil_In32(AD1dav);
		Xil_Out32(AD1acq,0);			//ADC stop acquire
		adcdata1=Xil_In32(AD1dat1);		//input ADC data
		adcdata2=Xil_In32(AD1dat2);
		while (adcdav==1)				//wait for reset
			adcdav=Xil_In32(AD1dav);

		x1d=x1c;						//ADC ch1 -> DAC ch1 FIR
		x1c=x1b;
		x1b=x1a;
		adcdata1=adcdata1-2048;			//offset for ADC
		x1a=adcdata1/8;					//efficient shift right scaling
		y1a=5*x1a+4*x1b+2*x1c+2*x1d;	//example FIR
		dacdata1=y1a+2048;				//offset to restore DAC

		dacdata2=adcdata2;              //ADC ch2 -> DAC ch2 straight through

		//DAC
		Xil_Out32(DA2dat1, dacdata1);	//output DAC data
		Xil_Out32(DA2dat2, dacdata2);
		Xil_Out32(DA2acq,1);			//DAC acquire
		while (dacdav==0)				//DAC data output?
			dacdav=Xil_In32(DA2dav);
		Xil_Out32(DA2acq,0);			//stop DAC acquire
		while(dacdav==1)				//wait for reset
			dacdav=Xil_In32(DA2dav);
	}
}