M5602_XB_I2C_CTRL
err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 1);
err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x08);
err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x18 + len);
0x13, M5602_XB_I2C_CTRL, 0x81, 0x11