RP2350B pin PIO function abnormality

[Octopus1633]

Hello,

I have successfully run the hello_pio example on RP2350B based on #2051 . Now RP2350B has two pins connected to USB. I want to use PIO to simulate USB to realize USB master-slave communication, but after burning the firmware, I don't detect any signal on the pins. Even if I use pins below 32 and PICO_PIO_USE_GPIO_BASE=0.

https://github.com/sekigon-gonnoc/Pico-PIO-USB This code works fine on the RP2040. If it is run on the RP2350B and the pins below 32 are used to implement the PIO function, the program should run without any modification.

RP2040:

RP2350B:

[peterharperuk]

Does it work on a RP2350A?

[lurch]

Perhaps you just need to modify the code to remove the GPIO isolation latches? (A new feature in RP2350 that wasn't in RP2040)

[Octopus1633]

Does it work on a RP2350A?

@peterharperuk Hello, I used RP2350A to test that USB communication can be carried out normally, and a stable signal can be detected.

Perhaps you just need to modify the code to remove the GPIO isolation latches? (A new feature in RP2350 that wasn't in RP2040)

@lurch Hello, how can I properly remove the GPIO isolation latch? I did not add any extra code when implementing it with RP2350A.

[lurch]

Ah, well if it works with RP2350A then I guess it should also work with RP2350B, so I'll leave this to Peter or Graham to investigate 🙂