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Feature: Accelerate BMPremote SPI data phase by removing inter-byte gaps #1946

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Feature: Accelerate BMPremote SPI data phase by removing inter-byte gaps #1946

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Commits on Oct 1, 2024

  1. spi: blackpill-f4: Implement spi_xfer_block for faster reads 

    * Existing implementation has to walk up and down the function stack per byte,
  which is fine for commands and general poking
* 256-byte long page reads and writes can be accelerated because the length is known ahead of time
* Keep a byte in flight on stm32f1/f4 SPI (this is simpler than IRQ or DMA)
    @ALTracer
    ALTracer committed Oct 1, 2024
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