System hangs when repeatedly triggering a wav file on Teensy 4.0 about sdfat-beta

[greiman]

SdFat uses two 512 byte cache buffers. One for FAT entries and one for file data. If you open multiple files, you will have problems since these caches will be invalidated often.

SdFat evolved from a 2008 library for an Arduino Diecimila with a ATmega168, 1 KB SRAM, and 16 KB flash and a single 512 byte sector cache.

It would be possible to extend SdFat for provide cache for each file but I have lost interest in developing SdFat.

SD cards are not intended to be multi stream devices without huge buffers and file read-ahead.

Teensy 4.0 is a nice board but is lacks a decent multi-tasking OS with an integrated file system that can cope with multiple data streams.

[alexrjohnston]

Thanks for taking the time to respond! Totally understandable, that all makes good sense. Do you think a pi running a light as possible os would be better suited for multiple data steams?

[greiman]

Pi has a better OS since the base is Linux. It depends on how the file system cache is configured.

[alexrjohnston]

Thanks for the replies I will look into it! Regards, Al.

[PaulStoffregen]

Hopefully this has fixed the problem.

PaulStoffregen/Audio@6369a6a