Ejemplo n.º 1
0
int i2cdev_write(int fd, uint8_t *buf, size_t count, uint16_t addr)
{
	return i2cdev_transfer(fd, buf, count, addr, 0);
}
Ejemplo n.º 2
0
int i2ctool_get(FAR struct i2ctool_s *i2ctool, int fd, uint8_t regaddr,
                FAR uint16_t *result)
{
  struct i2c_msg_s msg[2];
  union
  {
    uint16_t data16;
    uint8_t  data8;
  } u;
  int ret;

  /* Set up data structures */

  msg[0].frequency = i2ctool->freq;
  msg[0].addr      = i2ctool->addr;
  msg[0].flags     = 0;
  msg[0].buffer    = &regaddr;
  msg[0].length    = 1;

  msg[0].frequency = i2ctool->freq;
  msg[1].addr      = i2ctool->addr;
  msg[1].flags     = I2C_M_READ;

  if (i2ctool->width == 8)
    {
      msg[1].buffer = &u.data8;
      msg[1].length = 1;
    }
  else
    {
      msg[1].buffer = (uint8_t*)&u.data16;
      msg[1].length = 2;
    }

  if (i2ctool->start)
    {
      ret = i2cdev_transfer(fd, &msg[0], 1);
      if (ret== OK)
        {
          ret = i2cdev_transfer(fd, &msg[1], 1);
        }
    }
  else
    {
      ret = i2cdev_transfer(fd, msg, 2);
    }

  /* Return the result of the read operation */

  if (ret == OK)
    {
      if (i2ctool->width == 8)
        {
          *result = (uint16_t)u.data8;
        }
      else
        {
          *result =  u.data16;
        }
    }

  return ret;
}
Ejemplo n.º 3
0
int i2cdev_read(int fd, uint8_t *buf, size_t count, uint16_t addr)
{
	return i2cdev_transfer(fd, buf, count, addr, 1);
}