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  1. The SD card for Teensy 4.1 is over the SDIO...

    The SD card for Teensy 4.1 is over the SDIO interface on LPSPI1. Each SPI port has a 16 word FIFO buffer. You can configure this to trigger an interrupt when it receives data. This interrupt can then...
  2. Yes. Via DMA.

    Yes. Via DMA.
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