Help needed for GPIO pins allocations for I2S and UART

[michcfr]

Hello,

Can please suggest me the GPIO numbers I can allocate to I2S/DIN and UART/TXD pins, knowing that the only remaining available ESP32 pins on my schematics are:
GIO36 (input only pin)
GIO39 (input only pin)
GIO34 (input only pin)
GIO32
GIO33
GIO27
GIO2
GIO15

For information the current pin allocations are:
-I2S: MCLK (GPIO0), SDOUT (GPIO35-works with input only pin), LRCLK (GPIO25), SCLK (GPIO12)
-UART: RXD (SD2/GPIO9). For TXD, SD3/GPIO10 is leaved free since it is needed to connect to external PSRAM


Thank you
Michel

[michcfr]

a little up for myself
Thank you

[ExtrasensoryNoob]

Did you ever figure this out? I'd like to know if GPI 39 (input only) will work. That pin doesn't have an internal pullup.

I found this post saying with an external DAC any ESP32 pin can be used for any I2S signal. That sounds good, but how is it possible for the 4 GPI pins? Don't they need to output?
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