ErgoMechKeyboards @lemmy.world anaumann @lemmy.world 11 mo. ago

Underglow in ZMK on Seeedstudio Xiao BLE not working

Hey all.

I am currently prototyping a keyboard with the Seeedstudio Xiao BLE (nrf52840). I configured the shield config correctly & got it working. However, my RGB won’t turn on (followed the ZMK documentation on RGB underglow)

Does anybody have a pointer to a project that got RGB working with Seeedstudio Xiao BLE & RGB?

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4 comments

Are you feeding the leds with 5v or 3.3v? I've had issues with 5v and no shift registers as the led won't pickup the high state of the leddata without a shift register.

https://github.com/WainingForests/zmk-config-xiao/tree/Xiao_rgb I have successfully done LEDS just fine. Per key is a misnomer though. ZMK doesn't allow individually addressing each key. Instead, you'll be using underglow to apply effects to the whole "chain."
- See my other response for how I am driving the LEDs :) (Works fine with an Arduino program so that is not the issue here)
  
  It seems to me that I get this line wrong: NRF_PSEL(SPIM_MOSI, 0, 16). I would read this as "Set pin P0.16 as SPI MOSI", however I cannot find a pin P0.16 exposed on the Xiao BLE https://wiki.seeedstudio.com/XIAO_BLE/
  
  Can you give me a pointer where I am wrong?
  
  (my RGB pin is P1.11 / D6, so I would've assumed that I should change this to NRF_PSEL(SPIM_MOSI, 1, 11), I know that the use of low frequency pins is discouraged by ZMK docs)