/*****I2C TEST 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-1";
unsigned char buf[4];


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);
}


int main()
{
	unsigned char SLAVE_ADDRESS = 0x11;	//SLAVE ADDRESS
	unsigned char rddat1,rddat2,rddat3,rddat4;


	printf("**** I2C ALLPORT READ ****\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 ALL READ//
	buf[0] = 0xe0;
	/*if(i2cwrite(buf,1)){
			printf("write error SA = %02x\n",SLAVE_ADDRESS);
			exit(1);
		}*/
	if(ioctl(fd, I2C_SLAVE,SLAVE_ADDRESS) < 0) {
	printf("Unable to bus access to talk to slave\n");
	exit(1);
	}

	if(i2cread(fd,buf,4)){
		exit(1);
	}

	rddat1 = buf[0];
	rddat2 = buf[1];
	rddat3 = buf[2];
	rddat4 = buf[3];
	printf("Read Data PORT0  ----  %02x\n",rddat1);
	printf("Read Data PORT1  ----  %02x\n",rddat2);
	printf("Read Data PORT2  ----  %02x\n",rddat3);
	printf("Read Data PORT3  ----  %02x\n",rddat4);

	

	close(fd);
	/*return 1;*/
}