Share I2S clock&WS between both i2s interfaces

[michikite]

I set up a TX i2s interface on my esp32 and can see the master clock and left-right clock fine on my osciloscope.
I also set up a a second i2s RX interface with its own clock.

Now I was wondering about two things:

- Can I re-use the TX clock pins to drive both i2s interfaces ?
- Can I read those clock pins like normal GPIO pins? (This has no specific use, just wondering because I tried and I always read 0)

[ns1668]

- Can I re-use the TX clock pins to drive both i2s interfaces ?
I have managed to run a loopback from I2S0 TX to I2S1 RX - so yes you can drive the RX clock from TX output.

- Can I read those clock pins like normal GPIO pins? (This has no specific use, just wondering because I tried and I always read 0)
Unsure, maybe the state is in a peripheral register somewhere, take a look at the technical reference manual.

[michikite]

Thanks for the tip!
I got it to work.
The i2s driver sets the clock pin to OUTPUT.
changed it to input and output and mapped it to the second interface using the gpio matrix

[ns1668]

Good stuff, glad to hear its working.