Which uC has the most flexible, feature-packed SPI peripherals?

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  • libopencm3

    Open source ARM Cortex-M microcontroller library

  • that is fair. SPI isn't very portable across Arm cpu vendors because all peripherals are vendor specific, i.e. the registers will differ a lot and APIs reflect that. Finding common ground is hard unless using specifically designed portable libraries like https://github.com/libopencm3/libopencm3

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