i2c_set_scl
i2c_set_scl(dev, 0);
i2c_set_scl(dev, 1);
i2c_set_scl(dev, 0);
i2c_set_scl(dev, 1);
i2c_set_scl(dev, 1);
i2c_set_scl(dev, 0);
i2c_set_scl(dev, 1);