/* param base SAI base pointer param order Data order MSB or LSB  */
void SAI_RxSetFrameSyncPolarity(I2S_Type *base, sai_clock_polarity_t polarity)
/* param base SAI base pointer param order Data order MSB or LSB  */
void SAI_RxSetFrameSyncPolarity(I2S_Type *base, sai_clock_polarity_t polarity)
{
    uint32_t val = (base->RCR4) & (~I2S_RCR4_FSP_MASK);
    val |= I2S_RCR4_FSP(polarity);
    base->RCR4 = val;
}