andrewm@0: /*
andrewm@0:  * I2c.h
andrewm@0:  *
andrewm@0:  *  Created on: Oct 14, 2013
andrewm@0:  *      Author: Victor Zappi
andrewm@0:  */
andrewm@0: 
andrewm@0: #ifndef I2C_H_
andrewm@0: #define I2C_H_
andrewm@0: 
andrewm@0: #include <iostream>
andrewm@0: #include <iomanip>
andrewm@0: #include <string>
andrewm@0: #include <stdio.h>
andrewm@0: #include <stdlib.h>
andrewm@0: #include <unistd.h>
andrewm@0: #include <fcntl.h>
andrewm@0: #include <linux/i2c.h>
andrewm@0: #include <linux/i2c-dev.h>
andrewm@0: #include <sys/ioctl.h>
andrewm@0: #include <stropts.h>
andrewm@0: 
andrewm@0: #define MAX_BUF_NAME 64
andrewm@0: 
andrewm@0: using namespace std;
andrewm@0: 
andrewm@0: 
andrewm@0: class I2c
andrewm@0: {
andrewm@0: 
andrewm@0: protected:
andrewm@0: 	int i2C_bus;
andrewm@0: 	int i2C_address;
andrewm@0: 	int i2C_file;
andrewm@0: 
andrewm@0: public:
andrewm@0: 	int initI2C_RW(int bus, int address, int file);
andrewm@0: 	virtual int readI2C() = 0;
andrewm@0: 	int closeI2C();
andrewm@0: 
andrewm@0: 	virtual ~I2c();
andrewm@0: 
andrewm@0: };
andrewm@0: 
andrewm@0: 
andrewm@0: inline int I2c::initI2C_RW(int bus, int address, int fileHnd)
andrewm@0: {
andrewm@0: 	i2C_bus 	= bus;
andrewm@0: 	i2C_address = address;
andrewm@0: 	i2C_file 	= fileHnd;
andrewm@0: 
andrewm@0: 	// open I2C device as a file
andrewm@0: 	char namebuf[MAX_BUF_NAME];
andrewm@0: 	snprintf(namebuf, sizeof(namebuf), "/dev/i2c-%d", i2C_bus);
andrewm@0: 
andrewm@0: 	if ((i2C_file = open(namebuf, O_RDWR)) < 0)
andrewm@0: 	{
andrewm@0: 			cout << "Failed to open " << namebuf << " I2C Bus" << endl;
andrewm@0: 			return(1);
andrewm@0: 	}
andrewm@0: 
andrewm@0: 	// target device as slave
andrewm@0: 	if (ioctl(i2C_file, I2C_SLAVE, i2C_address) < 0){
andrewm@0: 			cout << "I2C_SLAVE address " << i2C_address << " failed..." << endl;
andrewm@0: 			return(2);
andrewm@0: 	}
andrewm@0: 
andrewm@0: 	return 0;
andrewm@0: }
andrewm@0: 
andrewm@0: 
andrewm@0: 
andrewm@0: inline int I2c::closeI2C()
andrewm@0: {
andrewm@0: 	if(close(i2C_file)>0)
andrewm@0: 	{
andrewm@0: 		cout << "Failed to close  file "<< i2C_file << endl;
andrewm@0: 		return 1;
andrewm@0: 	}
andrewm@0: 	return 0;
andrewm@0: }
andrewm@0: 
andrewm@0: 
andrewm@0: inline I2c::~I2c(){}
andrewm@0: 
andrewm@0: 
andrewm@0: #endif /* I2C_H_ */