#include<stdio.h>
#include<unistd.h>
#include<asm/io.h>
#include<linux/ppdev.h>
#include<linux/parport.h>
#include<linux/ioctl.h>
#include<fcntl.h>

main()
		int i,fd, backward=1,data1,y[400];
		unsigned char data;
  		struct ppdev_frob_struct frob;
 				
		/* i am using strobe signal as a RD of ADC */
		frob.mask= PARPORT_CONTROL_STROBE;
  	
		/* opening the device driver */
		
		fd=open("/dev/parport0", O_RDWR);
 
		/* claiming the port */
		ioctl(fd, PPCLAIM);
 /* Here i am doing enabling the ADC with strobe signal and reading the data pins of ADC */

/* Observer here i have  included on 3 micro second  delay in the loop, that means i should get sampling rate in kilo hertz...... but i can only sample at 300 Hz , this means it is taking approximately 3 milli second */ 		
		
		for(i=25;i<=400;i++)
		{
 
			frob.val= PARPORT_CONTROL_STROBE;
                 	/* enabling the ADC */
			ioctl(fd,PPFCONTROL, &frob);
       	                
			usleep(3)
	       	
			/* changing the direction of data pins */
				
			ioctl(fd, PPDATADIR, &backward);

	       		/* reading the data pins */
			
			ioctl(fd, PPRDATA, &data);
				
                	y[i] = data;
		        
 /* disabling the ADC */
			frob.val = 0;

			ioctl(fd, PPFCONTROL, &frob);
		
                 	
		}
		
		ioctl(fd, PPRELEASE);

		close(fd);
                

		
	}