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63a2a50b5f
Previously, the /CS signal was performed by enabling / disabling the SPI peripheral. This had the disadvantage that clock polarity settings where not applied starting with `spi_acquire()`, as assumed by e.g. the SPI SD card driver, but only just before transmitting data. Now the SPI peripheral is enabled on `spi_acquire()` and only disabled when calling `spi_release()`, and the `SPI_CR2_SSOE` bit in the `CR2` register is used for hardware /CS handling (as supposed to).