uint32_t Mode; /*!< Specifies the I2S operating mode. This parameter can be a value of @ref I2S_Mode */ uint32_t Standard; /*!< Specifies the standard used for the I2S communication. This parameter ...

The I2S driver for STM32F4 (and other series?) currently assumes the SPI peripheral clock to be the I2S kernel clock. This is not the case, because in I2S mode, the SPI peripheral is supplied by the ...