Ralf e3174d7a99 STM32 SPI: Set clk-pin pull-up/-down to match spi clock polarity
RM0394:

    40.4.6
    Communication formats
    ...
    The idle state of SCK must correspond to the polarity selected in the SPIx_CR1 register (by
    pulling up SCK if CPOL=1 or pulling down SCK if CPOL=0).
2023-02-06 13:23:35 +01:00
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