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Hi, I don't have any particular insight, but I've been using the SD reader for a while now and it does work.

Fairly obvious suggestions:
1.Format the SD cards with the official formatter: ...

Damn!!

You are right; I have it backwards. I'm an idiot.

Thanks.

I have been using the Knowles mic, successfully, and am now testing the ICS 40730 mic.

I have soldered it, I believe correctly, but get no signal. I am getting 2.5 V on the inverting output,...

Thanks. That is helpful.

I also confirm multiple problems with SDCARD on Teensy 4.1

Hi. I have the SD card working fine, although I have actually only used one card.

The EXTMEM, on the other hand....

My question...

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:...

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...

Thanks for responding.

I'll look into DMA. The Learning Curve may be a bit steep for the current problem.

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...

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...

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...