Porting a PWM timing and frequency measurement library to the PICO 2 (RP2350)

[snizbatch]

I have found a terrific website with Micropython code to acquire PWM frequency and timing from DMA. It was working great on the RP2040. I dug through the RP2040 datasheet and then translated all of the changed registers to the RP2350. Now when I launch the code, I get Zero (0) for every readout. Can anyone with a deeper working knowledge of the RP2350 core help me understand why this isn't working or why it is no longer compatible if that is the case?
Here's my adaptation: adapted_code_non_working.zip

Thanks,
Jim