[Raspberry Pi] Status des I2C-Busses auslesen

# modprobe i2c-dev

#include <linux/i2c-dev.h>

#include <linux/i2c.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <sys/ioctl.h>

int main()

{

  int bus;

  bus = open( "/dev/i2c-0", O_RDWR );

  if ( bus == -1 )

  {

    // error

  }

  unsigned char slave_addr = 0x05;

  ioctl( bus, I2C_SLAVE, slave_addr );

  char buffer[] = {0, 6, 2};

  unsigned int bytes;

  bytes = write( bus, buffer, sizeof(buffer) );

  close (bus);

  return 0;

}