SPIClass's internal spi_t instance is not initialised with default values. This can cause problems in particular with the fields in the SPI_InitTypeDef struct, which can currently take invalid values ...
The init() method enables the pull-up resistors by default. this means that there is 5V on each pin. Even if I then configure the pins as output, there will be a very short time that a weak 5V is ...
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