ESP32 no display with 32x64 RGB

I’m trying to get a 64x32 RGB display working with an ESP32. I’m just trying the demo examples and I just have a blank display.

I can get the display to work with a ESP32-RGB64x32MatrixPanel-I2S-DMA.

I’ve tried using the ESP32_FORUM_PINOUT and got nothing. I’ve tried changing all the pin maps to the I2S-DMA pin maps and still get nothing.

Is there a way I can slow the clock down or something to validate that the connectivity works?
I’m planning to get a custom PCB, so I need to validate functionality before getting it fabricated.

Not sure what could be wrong. Can you paste the configuration section of the Bitmaps sketch, modified for your panel?

Thank you for the suggestion. I tried the Bitmaps sketch and noticed that it was set to SMARTMATRIX_HUB75_32ROW_MOD16SCAN. When I made that change things started working normally.
I’ve got a small number of ghosted pixels and other artifacts, but that’s probably a consequence of no level shifters and moderately long cables (they get better or worse with moving the cable).