Add PIO-based SoftwareSPI enabling SPI on any pins #2778
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The Raspberry Pi team has a working PIO-based SPI interface. Wrap it to work like a hardware SPI interface, allowing SPI on any pin combination. Tested reading and writing an SD card using unmodified SD library.
Good for testing, shows non-contiguous pinouts.
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The Raspberry Pi team has a working PIO-based SPI interface. Wrap it to work like a hardware SPI interface, allowing SPI on any pin combination.
Tested reading and writing an SD card using unmodified SD library.