code: func (c *digisparkI2cConnection) Init() (err error) {
  	if !c.adaptor.i2c {
  		if err = c.adaptor.littleWire.i2cInit(); err != nil {
  			return
  		}
  		c.adaptor.i2c = true
  	}
  	return
  }
docs: // Init makes sure that the i2c device is already initialized