/*****RAS-32IO-V2 I2C Read Sample Program*****/

#include<stdio.h>
#include<stdlib.h>
#include<linux/i2c-dev.h>
#include<fcntl.h>
#include<string.h>
#include<sys/ioctl.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>



int fd;
//char *i2cdev = "/dev/i2c-0";
char *i2cdev = "/dev/i2c-1";
unsigned char buf[2];


int i2cwrite(char *buf, int len)
{
	if((write(fd, buf, len)) != len){
		return(1);
	}
	return(0);
}

int i2cread(int offset, char *buf, int len)
{
	if(i2cwrite(buf,1)){
		printf("Err:- i2cwrite\n");
		return(1);
	}
	*buf = (char)offset;
	if(read(fd,buf,len) != len) {
		printf("Err:- i2cread\n");
		return(1);
	}
	return(0);
}


main()
{
	unsigned char SLAVE_ADDRESS = 0x11;	//SLAVE ADDRESS
	unsigned char rddat;


	printf("**** I2C READ SAMPLE ****\n");
	if((fd = open(i2cdev, O_RDWR)) < 0){
		printf("Can't open i2c\n");
		exit(1);
	}
	if(ioctl(fd,I2C_SLAVE, SLAVE_ADDRESS) < 0){
		printf("Unable to get bus access to talk to slave\n");
		exit(1);
	}

//PORT 0 READ//
	buf[0] = 0x02;
	if(i2cread(fd,buf,1)){
		exit(1);
	}
	rddat = buf[0];
	printf("Read Data  ----  %02x\n",rddat);

//PORT 1 READ//
	buf[0] = 0x03;
	if(i2cread(fd,buf,1)){
		exit(1);
	}
	rddat = buf[0];
	printf("Read Data  ----  %02x\n",rddat);
	close(fd);
	return 0;
}