CDNC_I2C_CR_CLR_FIFO
WR2(sc, CDNC_I2C_CR, CDNC_I2C_CR_CLR_FIFO);
WR2(sc, CDNC_I2C_CR, sc->cfg_reg_shadow | CDNC_I2C_CR_CLR_FIFO);
WR2(sc, CDNC_I2C_CR, sc->cfg_reg_shadow | CDNC_I2C_CR_CLR_FIFO);
WR2(sc, CDNC_I2C_CR, sc->cfg_reg_shadow | CDNC_I2C_CR_CLR_FIFO);
WR2(sc, CDNC_I2C_CR, CDNC_I2C_CR_CLR_FIFO);