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    I am recognizing an SD card on the Teensy 4.1...

    I am recognizing an SD card on the Teensy 4.1 internal.

    However, I get this warning:

    Multiple libraries were found for "SD.h"
    Used:...
  2. The problem I had with the Due was that the...

    The problem I had with the Due was that the program worked some of the time, but occasionally hung the machine. I assumed my interrupt was occasionally falling in the middle of something critical...
  3. Thanks for responding. I'll look into DMA. The...

    Thanks for responding.

    I'll look into DMA. The Learning Curve may be a bit steep for the current problem.
  4. Thanks for the reply. Don't know about...

    Thanks for the reply.

    Don't know about twilight zone, but often in the fog.

    Parallel isn't hard except for getting all the blankety-blank wires sorted out. And, I don't have to figure out the...
  5. Thanks for the response. I am trying very hard...

    Thanks for the response.

    I am trying very hard to avoid delving into the SDHC code.

    Interrupts won't affect polling unless the ISR is longer than the sample interval. Then I lose a sample. I...
  6. Teensy 4.1--Interrupts or polling, and internal SD card

    I need to acquire data from a 16 bit parallel ADC card at 250K samples/sec and stream to an SD card. The ADC card is driven by an external oscillator. I have currently running an Arduino Due, which...
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