Contact: arnaud.pouliquen@st.com
Description:
For audio purpose only.
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Used by audio driver to set/get the spi input frequency.
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This is mandatory if DFSDM is slave on SPI bus, to
provide information on the SPI clock frequency during runtime
Notice that the SPI frequency should be a multiple of sample
frequency to ensure the precision.
- if DFSDM input is SPI master
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+ if DFSDM input is SPI master:
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Reading SPI clkout frequency,
error on writing
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If DFSDM input is SPI Slave:
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Reading returns value previously set.
Writing value before starting conversions.