/* param base SAI base pointer param order Data order MSB or LSB  */
void SAI_TxSetFrameSyncPolarity(I2S_Type *base, sai_clock_polarity_t polarity)
/* param base SAI base pointer param order Data order MSB or LSB  */
void SAI_TxSetFrameSyncPolarity(I2S_Type *base, sai_clock_polarity_t polarity)
{
    uint32_t val = (base->TCR4) & (~I2S_TCR4_FSP_MASK);
    val |= I2S_TCR4_FSP(polarity);
    base->TCR4 = val;
}