New board support. STM32L4

[jacky4566]

Feature request

Is your feature request related to a problem? Please describe.

Yes, Trying to get support for STM32L4 Via core from GrumpyOldPizza https://github.com/GrumpyOldPizza/arduino-STM32L4

Currently board crashes when trying to use SPI1

Describe the solution you'd like

Support for Butterfly-STM32L433CC with SPI1

Describe alternatives you've considered

None

Additional context

None

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[jacky4566]

Got it. Initial testing shows good with the STM32L433CC

Just had to add some extra lines. In the Core variant.h file: #define ARCH_STM32

In the arduino program file: SPI1.begin();