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docs(mch2022): say which firmware the RGBW fix needs #256

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annejan merged 1 commit into from
Aug 14, 2026
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docs(mch2022): say which firmware the RGBW fix needs #256

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12 changes: 8 additions & 4 deletions content/en/docs/Badges/MCH2022/software-development/api/ws2812.md
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Expand Up @@ -99,9 +99,13 @@ the five LEDs of the tilde add-on, then fades each color up and down,
first across all five LEDs together and then one LED at a time. It is a
short read and a good starting point for your own add-on.

{{% alert title="RGBW mode does not work yet" color="warning" %}}
Mode `2` is meant to select 32-bit RGBW output, but the RP2040 firmware
falls through from that case straight into disabling the output, so the
LEDs go dark instead. Use mode `1` until that is fixed upstream.
{{% alert title="RGBW mode needs a firmware newer than 0x0C" color="warning" %}}
Mode `2` selects 32-bit RGBW output. On every released RP2040 firmware up
to and including `0x0C` it turns the LEDs off instead: the switch enables
the output and then falls through into the disable case.

[The fix](https://github.com/badgeteam/mch2022-firmware-rp2040/pull/22) is
on `master` and is not in a release yet, so a badge you did not build the
firmware for yourself still has this. Use mode `1` there.
{{% /alert %}}

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