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RE: I2C Access with 5CSX Development Board » i2cdevice.cpp

Michael Williamson, 06/17/2014 11:04 AM

 
#include "i2cdevice.h"
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <linux/i2c-dev.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>

using namespace MityDSP;

tcI2CDevice::tcI2CDevice(int bus, int slave_addr)
: mnFd(-1)
, mnBus(bus)
, mnAddr(slave_addr)
{
}

tcI2CDevice::~tcI2CDevice(void)
{
if (mnFd >= 0)
{
Close();
}
}
int tcI2CDevice::Open(void)
{
int ret;
char fname[100];
char buff[128];
sprintf(fname,"/dev/i2c-%d",mnBus);
mnFd = open(fname,O_RDWR);
if (mnFd < 0)
{
sprintf(buff, "tcI2CDevice::Open:%s:",fname);
perror(buff);
return mnFd;
}
ret = ioctl(mnFd, I2C_SLAVE, mnAddr);
if (ret < 0)
{
perror("tcI2CDevice::Open:ioctl:");
Close();
}
return ret;
}

int tcI2CDevice::Close(void)
{
//Return success if nothing to close
int retval = 0;
if (mnFd >= 0)
{
retval = close(mnFd);
mnFd = -1;
}

return retval;
}

const char* tcI2CDevice::GetError(int /* err */)
{
return "Unknown";
}
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