view include/I2c.h @ 45:579c86316008 newapi

Major API overhaul. Moved to a single data structure for handling render functions. Functionally, generally similar except for scheduling within PRU loop function, which now uses interrupts from the PRU rather than polling. This requires an updated kernel.

/*
 * I2c.h
 *
 *  Created on: Oct 14, 2013
 *      Author: Victor Zappi
 */

#ifndef I2C_H_
#define I2C_H_

#include <iostream>
#include <iomanip>
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <stropts.h>

#define MAX_BUF_NAME 64

using namespace std;


class I2c
{

protected:
	int i2C_bus;
	int i2C_address;
	int i2C_file;

public:
	int initI2C_RW(int bus, int address, int file);
	virtual int readI2C() = 0;
	int closeI2C();

	virtual ~I2c();

};


inline int I2c::initI2C_RW(int bus, int address, int fileHnd)
{
	i2C_bus 	= bus;
	i2C_address = address;
	i2C_file 	= fileHnd;

	// open I2C device as a file
	char namebuf[MAX_BUF_NAME];
	snprintf(namebuf, sizeof(namebuf), "/dev/i2c-%d", i2C_bus);

	if ((i2C_file = open(namebuf, O_RDWR)) < 0)
	{
			cout << "Failed to open " << namebuf << " I2C Bus" << endl;
			return(1);
	}

	// target device as slave
	if (ioctl(i2C_file, I2C_SLAVE, i2C_address) < 0){
			cout << "I2C_SLAVE address " << i2C_address << " failed..." << endl;
			return(2);
	}

	return 0;
}



inline int I2c::closeI2C()
{
	if(close(i2C_file)>0)
	{
		cout << "Failed to close  file "<< i2C_file << endl;
		return 1;
	}
	return 0;
}


inline I2c::~I2c(){}


#endif /* I2C_H_ */