RTEMS | stm32h7: Resolve warnings and add SPI support (!204)

[Cedric Berger (@cedric)]

Cedric Berger commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/204#note_111839


Hello Kinsey, thanks for doing that.
I'm in the train reading your patch, `stm32h7_spi_transfer()` specifically, and I've one comment:
SPI can be full-duplex, And I think you don't handle the case where both a TX and RX buffer are provided.
In that function, if `(msg->rx_buf != NULL && msg->tx_buf != NULL)`, then you should call `HAL_SPI_TransmitReceive()`, and not `HAL_SPI_Transmit()` followed by `HAL_SPI_Receive()`

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/204#note_111839
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