When using the non-canonical mode, the file descriptor can be opened
in blocking mode because the VTIME and VMIN termios parameters are
used to configure non-blocking mode. However, in canonical mode, the fd needs to be opened with O_NONBLOCK
1. The type correction was merged as part of
eive/fsfw#7 in the
EIVE project. Quotation of PR
definition of getSpiParameters is `void getSpiParameters(spi::SpiModes& spiMode, uint32_t& spiSpeed, UncommonParameters* parameters = nullptr) const;`.
Here, size_t spiSpeed is passed, which implicitely gets converted to a temporary, which can not be bound to uint32_t& and, at least in gcc 9.3.0, leads to a compiler error.
2. Allow flushing the UART buffers
