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Seven Segment Display Reloaded: fix boot loop when the usermod is enabled - #5920
StefanRiese wants to merge 4 commits into
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WalkthroughThe usermod now renders the year’s last two digits for the ChangesSeven-segment display updates
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 1 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly identifies the affected usermod and the primary fix for the reported boot loop. It is specific and directly related to the changes. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
- Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
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can you explain? if the usermod worked before, why is it broken now? what you describe here sounds more like a core bug. |
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Sorry for the AI comment but I think this describes it best: I last used this usermod with version 0.13, so the crash showed up for me after updating to 16.0.1. It is triggered by a core change in 16.0.1. The order So yes, it's a core ordering issue that could affect other usermods with state allocated in
Not tested: whether 0.14/0.15 with "Turn LEDs on after power up" disabled crashed the same way. Happy to change this PR to whatever you prefer. You are interacting with an AI system |
that is a bit iffy and may need to be looked at (cc @willmmiles) question: since you left the AI markers, did you review and fully understand the code you submitted? |
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Yes the code was review and even fully tested on a real device. I would also recommend that each usermod fixes this kind of issue, even when the core is the root cause. Some changes like that can always happen and the usermod should be able to handle this. |
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AI's love to make functions for no good reason. The simplest fix would be to check for null pointer. Most usermods als have a "initialized" flag and run nothing until setup has actually run. edit: I think the realloc in the original code is also not used correctly. |
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@coderabbitai are there other usermods that suffer from this issue? |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
rg -n -C3 '\bhandleOverlayDraw\s*\(' .
rg -n -C3 '\bbeginStrip\s*\(|\bUsermodManager::setup\s*\(|\busermods\.setup\s*\(|\bsetShowCallback\s*\(' .
fd -i 'wled\.cpp|usermod.*\.(cpp|h)$|seven_segment_display_reloaded' | head -100Length of output: 22388 🏁 Script executed: #!/bin/bash
for f in \
usermods/Analog_Clock/Analog_Clock.cpp \
usermods/Cronixie/Cronixie.cpp \
usermods/seven_segment_display/seven_segment_display.cpp \
usermods/usermod_v2_klipper_percentage/usermod_v2_klipper_percentage.cpp \
usermods/usermod_v2_ping_pong_clock/usermod_v2_ping_pong_clock.cpp \
usermods/usermod_v2_word_clock/usermod_v2_word_clock.cpp \
usermods/mpu6050_imu/usermod_gyro_surge.h \
usermods/seven_segment_display_reloaded/seven_segment_display_reloaded.cpp; do
echo "=== $f ==="
ast-grep outline "$f" --items all --view expanded
done
ast-grep outline wled00/wled.cpp --match 'beginStrip|setup' --view expanded
sed -n '661,720p' wled00/wled.cpp
rg -n -C3 '\b_callback\s*\(' wled00Length of output: 11848 🏁 Script executed: #!/bin/bash
echo '=== Analog Clock ==='
nl -ba usermods/Analog_Clock/Analog_Clock.cpp | sed -n '1,255p'
echo '=== Cronixie ==='
nl -ba usermods/Cronixie/Cronixie.cpp | sed -n '1,290p'
echo '=== Seven segment methods ==='
rg -n -C3 '\b(setup|_overlaySevenSegmentDraw)\s*\(' usermods/seven_segment_display/seven_segment_display.cpp
nl -ba usermods/seven_segment_display/seven_segment_display.cpp | sed -n '65,235p'
echo '=== Klipper ==='
nl -ba usermods/usermod_v2_klipper_percentage/usermod_v2_klipper_percentage.cpp | sed -n '1,210p'
echo '=== Ping pong ==='
nl -ba usermods/usermod_v2_ping_pong_clock/usermod_v2_ping_pong_clock.cpp | sed -n '1,180p'
echo '=== Word clock ==='
rg -n -C4 '\b(setup|handleOverlayDraw)\s*\(' usermods/usermod_v2_word_clock/usermod_v2_word_clock.cpp
nl -ba usermods/usermod_v2_word_clock/usermod_v2_word_clock.cpp | sed -n '110,165p;470,520p'
echo '=== Gyro ==='
nl -ba usermods/mpu6050_imu/usermod_gyro_surge.h | sed -n '90,220p'
echo '=== Show implementation location ==='
rg -n -C4 '\bWS2812FX::show\s*\(|\b_callback\b' wled00/FX_fcn.cppLength of output: 56607 🏁 Script executed: #!/bin/bash
nl -ba usermods/mpu6050_imu/usermod_gyro_surge.h | sed -n '1,92p'
rg -n -C4 '\b(deserializeConfigFromFS|deserializeConfig|readFromConfig)\s*\(' wled00/wled.cpp wled00/cfg.cpp wled00/um_manager.cpp
ast-grep outline wled00/FX_fcn.cpp --match 'setPixelColor|fadeToBlackBy|show' --view expanded
rg -n -C5 '\b(WS2812FX::setPixelColor|Segment::fadeToBlackBy|Segment::setPixelColor)\s*\(' wled00/FX_fcn.cpp
rg -n -C3 '\bgetSegment\s*\(' wled00/FX.h | tail -45
fd -i 'WString\.(cpp|h)$'
nl -ba wled00/wled.cpp | sed -n '480,550p'
nl -ba wled00/FX_fcn.cpp | sed -n '1863,1895p'Length of output: 13908
Analog ClockIn
If Analog Clock is enabled at boot, its first overlay can therefore use configured endpoints with the constructor’s default size of 60. This can select incorrect pixels before Other overlays checked
The core ordering concern is real in this checkout. I recommend preventing usermod overlay dispatch until usermod setup completes. That would address the shared lifecycle issue. SSDR’s off-by-one and allocation handling remain separate concerns. This was static inspection of the PR checkout, not hardware testing. You are interacting with an AI system. |
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WLED draws the first frame in beginStrip(), before UsermodManager::setup() runs. With "enabled" already read from cfg.json, handleOverlayDraw() wrote into umSSDRMask while it was still nullptr, so every boot ended in Exception (29) and the device was stuck in a boot loop. - allocate the mask once in setup() and skip the overlay while it is not allocated - fix off-by-one in _setAllFalse() / _setMaskToLeds() (i <= length wrote one byte past the mask) Tested on ESP8266 (WLED All-in-one Controller, 77 LEDs): boots with SSDR enabled, clock digits verified against the configured LED maps. Compiled for ESP8266 and ESP32 (lazy_grid_clock_* envs).
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I simplified some things. The helper is gone. The mask is allocated once in setup(), and handleOverlayDraw() skips drawing while it's null. The broken realloc is removed. If the LED count changes at runtime, the mask is now resized with d_realloc_malloc(). |
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Actionable comments posted: 1
🤖 Prompt to fix review comments
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Inline comments:
Review comments at
@usermods/seven_segment_display_reloaded/seven_segment_display_reloaded.cpp:
- Line 440: Update the guard using umSSDRMask so a null mask does not
permanently stop display updates: retry allocation for the current strip length
at a bounded interval, accounting for resize failure freeing the old mask, and
clear the successfully allocated mask before drawing.
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usermods/seven_segment_display_reloaded/seven_segment_display_reloaded.cpp
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For usermods, the untrusted ingress points are: readFromConfig(JsonObject& root) and calls to getJsonValue() readFromJsonState(JsonObject& obj) — JSON is parsed, but values are client-supplied onMqttMessage(char* topic, char* payload) — raw...
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🔇 Additional comments: 1
usermods/seven_segment_display_reloaded/seven_segment_display_reloaded.cpp: 1
264-264: LGTM!Also applies to: 272-272, 389-390
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good progres. never use force push on open PRs it messes up the review process and confuses the rabbit. |
`*map != nullptr` compared a String object against nullptr instead of
checking the pointer. Replace it and `equals("")` with `isEmpty()`.
The 'y' format displayed the seconds instead of the last two digits of the year, as documented in the readme.
softhack007
added
usermod
You did not say "I have reviewed the code" 🤔 ... so what kind of device has reviewed the code? Or was it a human? |
I have reviewed the code and tested it on a real device. |
My Lazy Grid Clock was stuck in a reboot loop after I enabled the SSDR usermod in V16.0.1.
What changed
WLED draws the first frame in
beginStrip(), before the usermods'setup(). With SSDR enabled in cfg.json,handleOverlayDraw()wrote into the LED mask while it was stillnullptr→ Exception (29) on every boot.Testing
AI disclosure
Root-cause analysis and code were done with AI assistance (Claude Code); changed code is marked with
// AI:comments. I reviewed and tested the change.Summary by CodeRabbit
ydisplay-mask token now shows the last two digits of the year instead of seconds.