NeoPixel on nRF5340

[PasVegan]

Hi,

Is it possible to use the Adafruit_NeoPixel library with the nRF5340 DK? I tried controlling an 8-pixel module using Zephyr’s led_strip example, but it didn’t work. I believe the pixels use the WS2812 protocol.

Has anyone successfully controlled NeoPixels with this board?

Thanks!

[jacks60806]

From my experience you won't be able to use the ws2812 gpio driver. I don't know about the ws2812_i2s or ws2812_spi implementations. The WS2812 timing is tight enough you won't be able to use the zephyr ws2812_gpio library and will need to create your own driver.

https://wp.josh.com/2014/05/13/ws2812-neopixels-are-not-so-finicky-once-you-get-to-know-them/

The "TOH 0 code", high voltage time maximum of 500ns is the problem.

As a warning if you attempt to control using gpio, you won't even be able to use the zephyr gpio_pin_set calls because minimum time to set and clear the pin exceeds 500ns. You'll need to call the nRF gpio pin set/clear functions directly.