yes, that does change 65535 to -1. I do however have other samples which are crazy large as seen by 6553 4 above. With the change to int16_t I get the output below. Why am I seeing -2 and -3 (or even much more negative!)

0
-1
-1
1
0
0
-1
-2
-1
2
2
-1
-3
-2
-2
0
1 ...

Looks like the documentation doesn't line up :(
read() - Read the next available byte from the I2S interface.
https://docs.espressif.com/projects/arduino-esp32/en/latest/api/i2s.html

But that would change things!

Although as I noted above it still does not work correctly - I get samples in the ...

Sure, changing to int means no negative numbers but I get samples in the ~6553x range which is not a valid sample (It's not that noisy!).

If you look at the definition of read() it's "Read the next available byte from the I2S interface." So, it's only 8 bits which ~65553x is definitely not ...

I'm trying to use a PDM microphone with the ESP32-S3 and arduino-esp32 library. I know I am reading microphone data (as it reacts to me blowing into the microphone), however I'm consistently getting negative values interspersed into the I2S output data. Has anyone got PDM working that can see where ...

Anybody have any ideas?

I am looking to get a PDM clock rate high enough for an ultrasonic PDM microphone to work correctly. So far I have only been able to get a 10Mhz PDM clock - can a higher clock rate be acheived?

The maximum clock I have seen seems to relate to this comment in section "12.3 The Clock of I2S Module ...