NeoPixels with RP2040 Encoders

Using Arduino LEDs and Multiplexing
1

Not sure if this is the correct forum to post this issue, but I've submitted a few git issues without a real solution.

I've got a Pi Pico using the earlephilhower Pico board profile, win11, IDEv2.3.2

I cannot compile a sketch using the Adafruit NeoPixel Library and any RP2040 compatible encoder library. From what I've gotten from other resources, there is a PIO conflict. Something about Neopixel not fully claiming PIO0's state machines until Neopixel::show() is called and the encoder library unaware of PIO0 being claimed...?!?

A lot of this way over my head. I am just trying to eventually have an encoder control Neopixel strip and eventually apply the effects to a HID joystick device. I'm looking for any solution. I assume this can't that difficult to achieve. Is it possible to force Neopixel to PIO1? Are they any other RP2040 encoder libraries besides PicoEncoder and RP2040-encoder-library?

Here is a link to Wokwi sketch that mirrors my local test sketch, NeoPixel x Encoder fails

  • Run as is, it compiles
  • Uncomment the encoder, Line23 and it breaks
  • Comment all of the Neopixels lines and uncomment the encoder::begin() it compiles.
2

For the neopixel library, you can try NeoPixelConnect. It defaults to pio0, but you can optionally select pio1.

I don't have any experience with rotary encoders and the RPi 2040, but this article might help.