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esp32-hal-ledc.c: Clear bit in used_channels bitmap #10089

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When we attach pin to LEDC channel we set bit in used_channels bitmap variable. But used_channels bit was not cleared on detach,
as result simply repeating attach/detach around 16 times will falsely use all available channels and
emit error that channel is not available.

This happen for example in IRSenderESP32.cpp.
This patch fixes this bug.

Sorry for not providing issue, as it require filling big amount of irrelevant form fields for just 2 lines of code.
To reproduce issue enable verbose debug and run in loop:
ledcAttach(13, 12000, 8);
ledcDetach(13);
It will fail, as i recall after 15 or 16th loop cycle.

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Test Results

 56 files   -  83   56 suites   - 83   4m 51s ⏱️ - 1h 38m 0s
 21 tests  -   9   21 ✅  -   9  0 💤 ±0  0 ❌ ±0 
135 runs   - 168  135 ✅  - 168  0 💤 ±0  0 ❌ ±0 

Results for commit 9f3a11a. ± Comparison against base commit f5be003.

This pull request removes 9 tests. 
performance.coremark.test_coremark ‑ test_coremark
performance.fibonacci.test_fibonacci ‑ test_fibonacci
performance.psramspeed.test_psramspeed ‑ test_psramspeed
performance.ramspeed.test_ramspeed ‑ test_ramspeed
performance.superpi.test_superpi ‑ test_superpi
test_touch_errors
test_touch_interrtupt
test_touch_read
validation.periman.test_periman ‑ test_periman

♻️ This comment has been updated with latest results.

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Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

MemoryFLASH [bytes]FLASH [%]RAM [bytes]RAM [%]
TargetDECINCDECINCDECINCDECINC
ESP32S30⚠️ +360.00⚠️ +0.01000.000.00
ESP32S20⚠️ +360.00⚠️ +0.01000.000.00
ESP32C30⚠️ +540.00⚠️ +0.02000.000.00
ESP32C60⚠️ +540.00⚠️ +0.03000.000.00
ESP32H20⚠️ +540.00⚠️ +0.02000.000.00
ESP320⚠️ +400.00⚠️ +0.01000.000.00
Click to expand the detailed deltas report [usage change in BYTES]
TargetESP32S3ESP32S2ESP32C3ESP32C6ESP32H2ESP32
ExampleFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAM
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ESP32/examples/AnalogOut/LEDCFade000000000000
ESP32/examples/AnalogOut/LEDCSingleChannel000000000000
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ESP32/examples/AnalogOut/SigmaDelta000000000000
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ESP32/examples/AnalogReadContinuous000000000000
ESP32/examples/ArduinoStackSize000000000000
ESP32/examples/CI/CIBoardsTest000000000000
ESP32/examples/Camera/CameraWebServer0000------00
ESP32/examples/ChipID/GetChipID000000000000
ESP32/examples/DeepSleep/ExternalWakeUp0000------00
ESP32/examples/DeepSleep/TimerWakeUp00000000--00
ESP32/examples/DeepSleep/TouchWakeUp0000------00
ESP32/examples/FreeRTOS/BasicMultiThreading000000000000
ESP32/examples/FreeRTOS/Mutex000000000000
ESP32/examples/FreeRTOS/Queue000000000000
ESP32/examples/FreeRTOS/Semaphore000000000000
ESP32/examples/GPIO/BlinkRGB000000000000
ESP32/examples/GPIO/FunctionalInterrupt000000000000
ESP32/examples/GPIO/FunctionalInterruptStruct000000000000
ESP32/examples/GPIO/GPIOInterrupt000000000000
ESP32/examples/HWCDC_Events00--000000--
ESP32/examples/MacAddress/GetMacAddress000000000000
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ESP32/examples/RMT/RMTReadXJT000000000000
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ESP32/examples/ResetReason/ResetReason2000000000000
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ESP32/examples/Serial/RS485_Echo_Demo000000000000
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ESP32/examples/Timer/WatchdogTimer000000000000
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ESP32/examples/Utilities/MD5Builder000000000000
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ESP_I2S/examples/ES8388_loopback000000000000
ESP_I2S/examples/Record_to_WAV00--------00
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ESP_SR/examples/Basic00----------
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USB/examples/Gamepad0000--------
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USB/examples/Keyboard/KeyboardMessage0000--------
USB/examples/Keyboard/KeyboardReprogram0000--------
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USB/examples/KeyboardAndMouseControl0000--------
USB/examples/MIDI/MidiController0000--------
USB/examples/MIDI/MidiInterface0000--------
USB/examples/MIDI/MidiMusicBox0000--------
USB/examples/MIDI/ReceiveMidi0000--------
USB/examples/Mouse/ButtonMouseControl0000--------
USB/examples/SystemControl0000--------
USB/examples/USBMSC0000--------
USB/examples/USBSerial0000--------
USB/examples/USBVendor0000--------
Update/examples/AWS_S3_OTA_Update00000000--00
Update/examples/HTTPS_OTA_Update00000000--00
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Update/examples/SD_Update000000000000
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WiFi/examples/WiFiAccessPoint00000000--00
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BluetoothSerial/examples/SerialToSerialBT_SSP----------00
BluetoothSerial/examples/bt_classic_device_discovery----------00
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ESP32/examples/DeepSleep/SmoothBlink_ULP_Code----------00
ESP32/examples/Touch/TouchButton----------00
Ethernet/examples/ETH_LAN8720----------00
Ethernet/examples/ETH_TLK110----------00

@nuclearcat
fix(esp32-hal-ledc): Clear bit in used_channels bitmap
9f3a11a 
When we attach pin to LEDC channel we set bit in used_channels bitmap variable.
But used_channels bit was not cleared on detach,
as result simply repeating attach/detach around 16 times
will falsely use all available channels and
emit error that channel is not available.

This happen for example in IRSenderESP32.cpp.
This patch fixes this bug.

Signed-off-by: Denys Fedoryshchenko <[email protected]>
@nuclearcat nuclearcat force-pushed the ledcdetach-bitmap-fix branch from bc7042a to 9f3a11a Compare July 31, 2024 00:00
@lucasssvaz lucasssvaz requested a review from P-R-O-C-H-Y July 31, 2024 04:14
@P-R-O-C-H-Y P-R-O-C-H-Y mentioned this pull request Jul 31, 2024
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Hello @nuclearcat, thank you very much for providing a PR and reporting the issue.
The fix is actually not on right place, the used_channel bits are cleared in ledcDetachBus function, called by Peripheral Manager. I have opened a PR #10094 with a proper fix, so I am closing this PR. Feel free to test with the changes from the PR I linked. Anyway thank you for pointing this out! :)

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@P-R-O-C-H-Y P-R-O-C-H-Y Awaiting requested review from P-R-O-C-H-Y

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