DA_FCTL
val = I2S_READ(sc, DA_FCTL);
I2S_WRITE(sc, DA_FCTL, val);
val = I2S_READ(sc, DA_FCTL);
I2S_WRITE(sc, DA_FCTL, val | DA_FCTL_FTX);
I2S_WRITE(sc, DA_FCTL, val & ~DA_FCTL_FTX);
val = I2S_READ(sc, DA_FCTL);
I2S_WRITE(sc, DA_FCTL, val | DA_FCTL_FRX);
I2S_WRITE(sc, DA_FCTL, val & ~DA_FCTL_FRX);