Add paired WS281x RGB+WW bus type - #5803
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Included review availability: Your plan includes up to 10 reviews per rolling hour; 9 remain after this review. WalkthroughThe PR adds ChangesWS2812 RGBW Pair Support
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR adds logical RGBW support for paired WS281x RGB and warm-white pixels without supplied evidence of a concrete merge-blocking issue; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant BusManager
participant PolyBus
participant WhitePixel
participant RGBPixel
BusManager->>PolyBus: allocate two physical pixels per logical RGBW pixel
BusManager->>WhitePixel: write white-only output
BusManager->>RGBPixel: write RGB-only output
WhitePixel-->>BusManager: read white channel
RGBPixel-->>BusManager: read RGB channels
BusManager-->>BusManager: reconstruct logical RGBW value
Suggested labels: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Actionable comments posted: 3
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Inline comments:
In `@wled00/bus_manager.cpp`:
- Around line 210-215: Update BusDigital to expose a physical standby-count
query that returns the doubled count for TYPE_WS2812_RGBW_PAIR buses and the
normal length otherwise. In BusManager::applyABL(), replace busd.getLength() in
both the global ABL minimum-current comparison and resulting value with this
physical count, preserving existing behavior for non-paired buses.
- Around line 244-246: Mask the color-order value to its lower nibble for
TYPE_WS2812_RGBW_PAIR, preventing W-swap bits from affecting physical RGB
channels. Apply this consistently in the brightness loop and the pair write and
read paths around getPixelColorOrder, while preserving the existing RGB channel
order for other strip types.
In `@wled00/const.h`:
- Line 359: Update the comment on TYPE_WS2812_RGBW_PAIR to include a space
immediately after the // marker, preserving the existing text.
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wled00/bus_manager.cppwled00/bus_manager.hwled00/bus_wrapper.hwled00/const.h
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@coderabbitai what is the difference between this PR and the RGBCCT bus types already supported in WLED? Lines 363 to 365 in 8584eb3 Line 631 in 8584eb3 |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '=== PR diff ==='
git diff --find-renames origin/main...HEAD -- \
wled00/bus_manager.cpp \
wled00/bus_manager.h \
wled00/bus_wrapper.h \
wled00/const.h
echo
echo '=== Focused symbol map ==='
ast-grep outline wled00/bus_manager.cpp --items all --match 'Bus|RGB|CCT|Physical|Length' --view expanded || true
ast-grep outline wled00/bus_manager.h --items all --match 'Bus|RGB|CCT|Physical|Length' --view expanded || true
echo
echo '=== Relevant type definitions and implementation contexts ==='
rg -n -C 8 \
'TYPE_WS2812_RGBW_PAIR|TYPE_[A-Z0-9_]*RGBCCT|TYPE_WS2812_CCT|RGBCCT|getPhysicalLength|hasWhite|setPixelColor|getPixelColor|estimateCurrent|autoWhite' \
wled00/bus_manager.cpp \
wled00/bus_manager.h \
wled00/bus_wrapper.h \
wled00/const.h
echo
echo '=== Referenced base revision contexts ==='
git show 8584eb3cf069448f368ffccdda433b9c69891b41:wled00/bus_manager.cpp | \
nl -ba | sed -n '340,380p;610,645p'Length of output: 101018
The new type is therefore not another native RGBCCT bus type. It is a mapping layer for a string where one visible bulb consumes two addressable RGB pixels. For each logical WLED RGBW pixel, the PR:
There is one detail to verify. The PR description and You are interacting with an AI system. |
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@coderabbitai we are currently re-writing the bus driver; intending to replace NPB with our own driver. Is this PR compatible with #5704 ? |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
repo="wled/WLED"
echo '=== PR 5704 metadata ==='
gh pr view 5704 --repo "$repo" --json number,title,state,baseRefName,headRefName,body,commits,files \
--jq '{number,title,state,baseRefName,headRefName,body, commits: [.commits[].oid], files: [.files[].path]}'
echo
echo '=== PR 5704 files ==='
gh pr diff 5704 --repo "$repo" --name-only
echo
echo '=== PR 5704 focused diff ==='
gh pr diff 5704 --repo "$repo" -- \
wled00/bus_manager.cpp \
wled00/bus_manager.h \
wled00/bus_wrapper.h \
wled00/const.h \
| sed -n '1,1800p'
echo
echo '=== PR 5803 implementation map and relevant contexts ==='
ast-grep outline wled00/bus_manager.cpp --items all --match 'Bus|Pixel|Length|Current' --view expanded
ast-grep outline wled00/bus_manager.h --items all --match 'Bus|Pixel|Length|Current' --view expanded
rg -n -C 10 \
'TYPE_WS2812_RGBW_PAIR|getPhysicalLength|setPixelColor|getPixelColor|estimateCurrent|autoWhite|allocate|BusDigital' \
wled00/bus_manager.cpp wled00/bus_manager.h wled00/bus_wrapper.h wled00/const.hLength of output: 12888 🏁 Script executed: #!/bin/bash
set -euo pipefail
git fetch --quiet origin pull/5704/head:refs/remotes/origin/pr-5704
echo '=== PR 5704 symbol maps ==='
git show origin/pr-5704:wled00/bus_manager.cpp > /tmp/pr5704_bus_manager.cpp
git show origin/pr-5704:wled00/bus_manager.h > /tmp/pr5704_bus_manager.h
git show origin/pr-5704:wled00/bus_wrapper.h > /tmp/pr5704_bus_wrapper.h
git show origin/pr-5704:wled00/const.h > /tmp/pr5704_const.h
git show origin/pr-5704:wled00/src/WLEDpixelBus/WLEDpixelBus.h > /tmp/pr5704_WLEDpixelBus.h
ast-grep outline /tmp/pr5704_bus_manager.cpp --items all --match 'Bus|Pixel|Length|Current' --view expanded
ast-grep outline /tmp/pr5704_bus_manager.h --items all --match 'Bus|Pixel|Length|Current' --view expanded
ast-grep outline /tmp/pr5704_WLEDpixelBus.h --items all --match 'Bus|Pixel|Color|Length' --view expanded
echo
echo '=== PR 5704 paired-type availability and digital-bus handling ==='
rg -n -C 10 \
'TYPE_WS2812_RGBW_PAIR|TYPE_WS2812_RGBW|TYPE_WS2812_RGB|hasWhite|hasCCT|setPixelColor|getPixelColor|estimateCurrent|getPhysicalLength|allocate|Busses|BusDigital' \
/tmp/pr5704_bus_manager.cpp /tmp/pr5704_bus_manager.h /tmp/pr5704_bus_wrapper.h /tmp/pr5704_const.h
echo
echo '=== WLEDpixelBus channel and pixel API ==='
rg -n -C 8 \
'class |struct |enum |SetPixel|GetPixel|Pixel|Color|channels|Channel|bytes|length|Begin|Show' \
/tmp/pr5704_WLEDpixelBus.h
echo
echo '=== Relevant PR 5803 current implementation ==='
rg -n -C 8 \
'TYPE_WS2812_RGBW_PAIR|getPhysicalLength|setPixelColor|getPixelColor|estimateCurrent|allocate|BusDigital' \
wled00/bus_manager.cpp wled00/bus_manager.h wled00/bus_wrapper.h wled00/const.hLength of output: 235388
PR
The feature itself is compatible with the new driver architecture. It does not require NeoPixelBus-specific behavior. A port is required in
This point is important with I recommend that 🧠 Learnings usedYou are interacting with an AI system. |
| if (bus->isDigital() && bus->isOk()) { | ||
| BusDigital &busd = static_cast<BusDigital&>(*bus); | ||
| uint32_t busLength = busd.getLength(); | ||
| uint32_t busLength = busd.getPhysicalLength(); |
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why? This seems to affect all busses, not just the new paired type.
@coderabbitai does this change create side-effects for other LED drivers?
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🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
set -euo pipefail
header=$(fd -a '^bus_manager\.h$' . | head -n 1)
printf '%s\n' '--- BusDigital declaration and getPhysicalLength implementation ---'
rg -n -A12 -B12 'getPhysicalLength|class BusDigital' "$header" wled00/bus_manager.cpp
printf '%s\n' '--- All getPhysicalLength call sites ---'
rg -n -A3 -B3 '\bgetPhysicalLength\s*\(' wled00
printf '%s\n' '--- Relevant PR diff ---'
git diff --unified=30 HEAD^ HEAD -- wled00/bus_manager.cpp wled00/bus_manager.hLength of output: 19861
@softhack007, I verified the implementation.
getPhysicalLength() returns _len for every existing digital LED type. It returns _len * 2 only for TYPE_WS2812_RGBW_PAIR.
Therefore, Line 1535 has no functional side effect for other LED drivers. Their ABL calculation remains unchanged.
For TYPE_WS2812_RGBW_PAIR, the doubled value is required because each logical RGBW bulb has two physical WS281x LEDs. The value sets both:
- The per-bus ABL demand:
busLength * getLEDCurrent(). - The minimum standby-current allowance: one mA per physical LED.
This change is correct. I withdraw the concern.
@softhack007 I agree that this finding should be withdrawn, but I couldn't resolve this review thread on the repository platform, so it remains open. Please retry or resolve it manually.
You are interacting with an AI system.
| busd.applyBriLimit(0); // apply per bus ABL limit, updates _milliAmpsTotal if limit reached | ||
| milliAmpsSum += busd.getUsedCurrent(); | ||
| totalLEDs += busd.getLength(); // sum total number of LEDs for global Limit | ||
| totalLEDs += busd.getPhysicalLength(); // sum total number of physical LEDs for global Limit |
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same here - this change affects all LED drivers
3 participants
Summary
WS281x RGB+WW Pairdigital LED type for strings where each logical RGBW bulb is backed by two WS281x pixels2nand logical white to raw physical2n+1Working Settings Used For Hardware Validation
Tested on Govee S14 Outdoor String Lights 2, two 15-bulb strings connected end-to-end:
A normal single segment should use logical bulb indexes:
Empirical Basis
The tested Govee S14 strings are not native one-address RGBW pixels. Each visible bulb is two sequential WS281x pixels. With WLED hardware
Reversedoff, raw physical order was verified as:Earlier stock-WLED workaround notes that described even indexes as warm-white were observed with WLED hardware
Reversedenabled, which flips logical segment parity before writing to the strip. The new bus type keeps reverse operating on logical bulb order while preserving RGB/W order inside each two-pixel pair.Validation
esp32devbuild succeeded before changesesp32devbuild succeeded after changesnpm testpassed0-15lit exactly 15 visible bulbs while15-30stayed offThis remains a draft for maintainer/bot feedback while the remaining boot preset and Home Assistant checks are validated.
Summary by CodeRabbit