fix(drivers): resolve serial_escserial.c TX-pin, HAL-timer, and RX ownership defects - #1427
fix(drivers): resolve serial_escserial.c TX-pin, HAL-timer, and RX ownership defects#1427nerdCopter wants to merge 1 commit into
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…nership defects Ports BF 4.5-maintenance's tag-based timerAllocate() ownership check onto openEscSerial()'s RX timer resolution (IT emuflight#1408), which was still using a raw timerHardware[] array index. Fixes four bugs found in the same file during that port, confirmed on real HELIOSPRING (F4) and STM32F7X2/FOXEERF722V4 (F7/HAL) hardware: - escprog silently did nothing when no dedicated ESCSERIAL TX pin was configured (82/228 USE_ESCSERIAL targets). Ports BF master ae975492a's fallback to the RX motor pin for both directions. - H7 never got the timer alternate-function config in escSerialGPIOConfig() (guard was STM32F7-only); escserial RX was structurally dead on H7 targets. - TIM_DeInit() was a no-op stub on HAL builds; the motor timer was never reset before reuse and stayed running at the escserial timebase after passthrough exit. - configTimeBase()'s "already configured" guard silently skipped the period/prescaler rewrite when escserial repurposed an already-initialized timer on HAL builds. Ports BF's timerReconfigureTimeBase() to bypass it. escEnablePassthrough() now returns bool and threads motorConfig through, matching BF; the CLI caller reports failure instead of failing silently. The legacy first_output-scan-and-add offset is removed — both CLI and MSP callers already pass a plain, bounds-checked motor index. A related motor-timer ownership conflict was found but not fixed here (no release mechanism exists in EF or BF for any STM32 target): tracked as IT emuflight#1426, alongside the four fixes above. Fixes IT emuflight#1408. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe ESC serial driver now uses motor configuration tags for timer allocation, supports timer base reconfiguration across driver paths, and reports passthrough startup failures through updated CLI and MSP call paths. ChangesESC Serial Timer and Passthrough Flow
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to On targets without a dedicated TX pin, the shared timer fallback can overwrite transmit handling during receive setup, leaving SIMONK, BLHELI, and CASTLE ESC passthrough unable to transmit. This is a bounded correctness issue affecting supported configurations, so the PR is not merge-ready until it is corrected or explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant CLI_or_MSP
participant escEnablePassthrough
participant openEscSerial
participant timerAllocate
CLI_or_MSP->>escEnablePassthrough: motor configuration and output
escEnablePassthrough->>openEscSerial: validated output and motor configuration
openEscSerial->>timerAllocate: motor I/O tag
timerAllocate-->>openEscSerial: allocated timer or NULL
openEscSerial-->>escEnablePassthrough: serial port or NULL
escEnablePassthrough-->>CLI_or_MSP: success or failure
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The PR satisfies issue Full details: Description checkExplanation The description is detailed and relevant. It explains the fixes, scope, known limitations, linked issues, and test results. It does not repeat the repository template text, but it provides the required contribution context and is sufficiently complete. Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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@coderabbitai — AI generated comment Analysis requested on 3 specific points (draft PR, so the automatic per-push review is skipped):
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@coderabbitai — AI generated comment Analysis requested on 3 specific points:
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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
printf '%s\n' '== Candidate files =='
fd -t f -a 'serial_escserial\.c|timer(_hal)?\.c|timer\.h$' . | sort
printf '%s\n' '== ESC-serial structure =='
esc_file="$(fd -t f -a '^serial_escserial\.c$' . | head -n 1)"
if [ -n "$esc_file" ]; then
ast-grep outline "$esc_file" --items all --view expanded
fi
printf '%s\n' '== Timer API and implementation symbols =='
rg -n -C 4 '\btimerReconfigureTimeBase\b|\btimerAllocate\b|\btimerConfigure\b|\bTIM_DeInit\b' \
-g 'timer.h' -g 'timer.c' -g 'timer_hal.c' -g 'serial_escserial.c' .Length of output: 20718 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '== ESC-serial open/close and passthrough paths =='
sed -n '547,920p' src/main/drivers/serial_escserial.c
printf '%s\n' '== ESC-serial GPIO and timer setup paths =='
sed -n '130,210p' src/main/drivers/serial_escserial.c
sed -n '300,385p' src/main/drivers/serial_escserial.c
sed -n '455,550p' src/main/drivers/serial_escserial.c
printf '%s\n' '== Standard-peripheral time-base helpers =='
sed -n '255,330p' src/main/drivers/timer.c
printf '%s\n' '== HAL time-base helpers and timer configuration =='
sed -n '285,395p' src/main/drivers/timer_hal.c
printf '%s\n' '== Timer allocation and ownership implementation =='
rg -n -C 12 'const timerHardware_t \*timerAllocate\s*\(|resourceOwner_e timerGetOwner\s*\(|timerGetByTag\s*\(' src/main/driversLength of output: 38533 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '== PR diff for reviewed files =='
git diff "$(git merge-base HEAD origin/master)" HEAD -- \
src/main/drivers/serial_escserial.c \
src/main/drivers/timer.h \
src/main/drivers/timer.c \
src/main/drivers/timer_hal.c \
src/main/drivers/timer_common.c || true
printf '%s\n' '== EscSerial lifecycle call sites =='
rg -n -C 8 '\bescEnablePassthrough\s*\(|\bopenEscSerial\s*\(|\bcloseEscSerial\s*\(' \
src/main -g '*.[ch]'
printf '%s\n' '== Timer callback behavior for a shared timer channel =='
rg -n -C 8 '\bvoid timerChConfigCallbacks\s*\(' src/main/drivers -g '*.[ch]'
printf '%s\n' '== Timer owner reset or release operations =='
rg -n -C 6 'timerOwners|timerOwnerResourceIndices|OWNER_FREE|timer.*[Rr]elease|[Rr]elease.*timer' \
src/main -g '*.[ch]'Length of output: 47007 🤖 web_search executed:
Length of output: 19451 🤖 web_search executed:
Length of output: 17658
You are interacting with an AI system. |
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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 '=== Changed files ==='
git diff --name-only HEAD^ HEAD || true
echo '=== Locate requested files ==='
fd -a '^(serial_escserial|timer(_hal)?)\.(c|h)$' . || true
echo '=== Relevant diff ==='
git diff --find-renames HEAD^ HEAD -- \
'*serial_escserial.c' '*timer.h' '*timer.c' '*timer_hal.c' || true
echo '=== Symbol outlines ==='
for f in $(fd -a '^(serial_escserial|timer(_hal)?)\.(c|h)$' .); do
echo "--- $f"
ast-grep outline "$f" --items all --view expanded || true
done
echo '=== Timer allocation, fallback, reconfiguration, and cleanup references ==='
rg -n -C 5 \
-e '\btimerAllocate\s*\(' \
-e '\btimerReconfigureTimeBase\s*\(' \
-e '\bopenEscSerial\s*\(' \
-e '\bescEnablePassthrough\s*\(' \
-e '\bescSerialGPIOConfig\s*\(' \
-e '\btimerConfigure\s*\(' \
-e '\bTIM_DeInit\s*\(' \
-e '\boutputCount\b' \
-e '\brxTimerHardware\b' \
-e '\btxTimerHardware\b' \
$(fd -a '^(serial_escserial|timer(_hal)?)\.(c|h)$' .) || trueLength of output: 75424 🏁 Script executed: #!/bin/bash
set -euo pipefail
esc="$(fd -a '^serial_escserial\.c$' . | head -n1)"
timer_h="$(fd -a '^timer\.h$' . | head -n1)"
timer_c="$(fd -a '^timer\.c$' . | head -n1)"
timer_hal="$(fd -a '^timer_hal\.c$' . | head -n1)"
echo '=== ESC serial: modes, setup, and close path ==='
sed -n '130,205p;550,680p;800,890p' "$esc"
echo '=== timerAllocate declarations and implementations ==='
rg -n -C 12 -P '\btimerAllocate\s*\(' . \
-g '*.[ch]' -g '!**/test/**' -g '!**/tests/**'
echo '=== Resource allocation operations and owner semantics ==='
rg -n -C 8 \
-e '\bresourceAllocate\s*\(' \
-e '\bresourceClaim\s*\(' \
-e '\bresourceOwner_e\b' \
-e '\bOWNER_MOTOR\b' \
src/main 2>/dev/null || true
echo '=== stdperiph time-base and timer configuration ==='
sed -n '285,340p' "$timer_c"
echo '=== HAL time-base and timer configuration ==='
sed -n '295,385p' "$timer_hal"
echo '=== All ESC serial reconfiguration/configuration pairs ==='
rg -n -U -C 3 \
'timerReconfigureTimeBase\([^;]+;\n\s*timerConfigure\(' "$esc"
echo '=== ESC serial callers and result handling ==='
rg -n -C 8 -P '\bescEnablePassthrough\s*\(' src/main \
-g '*.[ch]'Length of output: 117061
Conclusion: Points 2 and 3 are correct. Point 1 is correct for the four single-output modes. KISSALL is the exception because it accepts partial allocation failure instead of failing on the first failed motor allocation. You are interacting with an AI system. |
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Actionable comments posted: 1
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Inline comments:
In `@src/main/drivers/serial_escserial.c`:
- Line 590: Update the timer setup around txTimerHardware and rxTimerHardware so
equal hardware uses a single half-duplex timer configuration instead of entering
both independent TX and RX paths. Remove the shared-timer fallback assignment
and ensure timerCb and edgeCb are not installed sequentially on the same
channel, preserving TX callbacks for SIMONK, BLHELI, and CASTLE passthrough.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
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Configuration used: Organization UI
Review profile: CHILL
Plan: Team
Run ID: 2af950df-1af6-479e-89a9-b370798b7181
📒 Files selected for processing (7)
src/main/drivers/serial_escserial.csrc/main/drivers/serial_escserial.hsrc/main/drivers/timer.csrc/main/drivers/timer.hsrc/main/drivers/timer_hal.csrc/main/interface/cli.csrc/main/interface/msp.c
Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.
📜 Review details
⏰ Context from checks skipped due to timeout. (13)
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🧰 Additional context used
🪛 Clang (14.0.6)
src/main/drivers/serial_escserial.h
[error] 41-41: unknown type name 'serialPort_t'
(clang-diagnostic-error)
🔇 Additional comments (3)
src/main/interface/cli.c (1)
2949-2951: LGTM!src/main/interface/msp.c (1)
214-214: LGTM!src/main/drivers/serial_escserial.h (1)
41-41: 🎯 Functional Correctness
serialPort_tis defined bydrivers/serial.h, and every direct consumer includes that header beforedrivers/serial_escserial.h. The reported compile failure does not apply to the repository’s supported include paths.
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@coderabbitai — AI generated comment Point 1 confirmed against source: Points 2 and 3 confirmed correct as implemented, no action needed. PR body and test plan updated to reflect this — the hardware tests performed opened the passthrough session successfully but did not exercise actual ESC communication (no ESC was connected in either test). |
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Tip For best results, initiate chat on the files or code changes.
Tracking the shared-timer callback overwrite in The updated PR description now correctly states the hardware-test scope. The tests confirmed passthrough session startup. They did not validate ESC communication because no ESC was connected. Points 2 and 3 need no further action for this PR. 🐇 You are interacting with an AI system. |
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Tip For best results, initiate chat on the files or code changes.
The shared-timer callback overwrite remains a valid limitation. Tracking it in Points 2 and 3 require no action. The updated hardware-test scope is clear. The tests validated passthrough session startup only. They did not validate ESC communication because no ESC was connected. 🐇 ✏️ Learnings added
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AI Generated pull-request
Summary
Ports BF 4.5-maintenance's tag-based
timerAllocate()ownership check ontoopenEscSerial()'s RX timer resolution (closes #1408), which previously used a rawtimerHardware[]array index with no ownership tracking. Implementing that port surfaced four additional bugs in the same file, all fixed here and confirmed on real hardware:USE_ESCSERIALtargets, e.g. HELIOSPRING). Ports BF masterae975492a's fallback to the RX motor pin for both directions when no TX pin exists.escSerialGPIOConfig()— the guard wasSTM32F7-only; BF 4.5-m includesSTM32H7. Escserial RX was structurally dead on H7 targets.TIM_DeInit()was a no-op stub on HAL builds (F7/H7) — the motor timer was never reset before reuse and stayed running at the escserial timebase after passthrough exit.configTimeBase()'s "already configured" guard silently skipped the period/prescaler rewrite when escserial repurposed an already-initialized timer on HAL builds. Ports BF'stimerReconfigureTimeBase()to bypass it.escEnablePassthrough()now returnsbooland threadsmotorConfigthrough, matching BF; the CLI caller reports failure instead of failing silently. The legacyfirst_output-scan-and-add offset is removed — both CLI and MSP callers already pass a plain, bounds-checked motor index (verified againstparseOutputIndex()/getMotorCount()).Two related findings were surfaced by CodeRabbit's post-push analysis and confirmed against source, neither fixed here — both are architecture-level gaps present in BF's own reference implementation, not regressions this PR introduces, and both are tracked together in #1426:
escprog's owntimerAllocate()claim always fails if that motor's timer was already claimed by boot-time motor init.txTimerHardware == rxTimerHardware) — the RX config call'stimerChConfigCallbacks()overwrites the TX callback registered moments earlier on the same channel slot.PROTOCOL_KISSis unaffected (TX-only in that branch). Present-both with BF —ae975492ahas the identical structure.Fixing either needs new design work beyond what BF has, out of scope here.
Test plan
CCACHE_DISABLE=1)make clean_test && make test— 49/49 binaries passescprog bl 0opened passthrough correctly post-fix (silently no-op pre-fix, per feat: serial_escserial.c RX timer resolution bypasses tag-based ownership check #1408); clean reboot, no resource/DMA corruption. No ESC was connected — this confirmsopenEscSerial()resolves and opens correctly, not actual ESC communication, which bug: serial_escserial.c TX-pin/HAL-timer defects and unfixed motor-timer ownership conflict #1426 found is likely broken for BLHeli mode specifically when the TX-pin fallback is active.USE_TIMER_MGMTcheck; callback clobber for BLHeli/SimonK/Castle modes)timerAllocate()/TX-fallback NULL-handling correct, KISSALLoutputCount==0early-return leaves no partial state,timerReconfigureTimeBase()ordering/platform-split correct; found the TX/RX callback-clobber issue above (now in bug: serial_escserial.c TX-pin/HAL-timer defects and unfixed motor-timer ownership conflict #1426)Closes #1408
Related: #1426